since 1976, our big dummy`s manual of cb repair has - Who-Sells-It
Contents
1. You ll be the envy of all your radio friends They ll come to you for help and advice And strangers will gladly pay you for the knowledge I m offering The going repair rate is now about 40 per hour THE SCREWDRIVER EXPERT S GUIDE To Peaking Out amp Repairing CB Radios you ll learn things like How to peak out your transmitter modulation and receiver for greatest range and efficiency How to wire any mike or power mike to any CB radio or diagnose and repair mike related problems How to diagnose and repair the most common antenna SWR problems How to diagnose and replace bad Finals and crystals for about 3 Worthless gimmicks and junk products that don t do anything Tips on curing automobile ignition noise The best brands to buy and what to avoid Methods of changing and adding channels for both crystal and PLL radios How to add FM to many AM or AM SSB models How to unlock the Clarifier so that it also slides on Transmit Specific power amp modulation adjustments for hundreds of American and foreign PLL models 5 In addition you ll learn once and for all the real dope on antennas and SWR with the most detailed most comprehensive and most practical discussion of this subject that anyone can understand Those other guys are great with the math but really doubt they ve had their hands on as many real CB radio antennas and installations as have The myths about this least understood area of CB radio will be2. IF transfomer SPECIAL NOTE The 10 695 MHz filter really cleans up all the Uniden amp Cybernet export radios and their clones HR2510 2600 Cherokee Connex Eagle Galaxy Magnum Mirage Northstar Ranger RCI Superstar etc And in every mode FEATURES e Provides up to 100 dB adjacent channel rejection This is much better than the majority of CB transceivers which typically specify only 40 to 60 dB A factor of 100 dB means that any signal outside the normal 10 KHz CB channel spacing is reduced in strength by a factor of 70 billion from channel center Typical response Sot high Q crystal filter Turn your ordinary rig into a hot performer e No reduction in receiver sensitivity In fact the CHANNEL GUARD adds one stage of amplification at the most critical point right in between IF filtering stages You may even hear those weak signals that you missed before e Every REACT monitor needs one to eliminate Channel 9 bleedover 8KHz 4KHz Center 4KHz 8KHz e Quality components used Each CHANNEL GUARD is hand made and I F Freq thoroughly checked against a powerful 30 000 uV modulated test signal You get a 1 Year Warranty when properly installed Just solder it in and forget it NOTE Most CBs use the IF frequencies shown Dual conversion SSB rigs that have a 455 KHz IF use that only for AM or FM otherwise most modern SSB types are 7 8 MHz or 10 695 MHz The AM only or AM FM only radios are 455 KHz IF Many ne
3. IHECBPLEDATA BOOK ce E E ae nee ee ee ee ene ete 20 00 _____ UNDERSTANDING amp REPAIRING CB RADIOS 0 ccccccccccccsccceccsseccseecsseeessecesseccssessseeesaesessuceseeseaeeeaeeesueecseeceseeesaeessaeseeeeens 42 00 ____ REPAIRMAN S SPECIAL All three of the above books You Save 17 00 ccccsssscceceeessssteeeeeeeens 70 00 _____ CB TUNE UP MODIFICATION REPORTS Price per radio MOdel c cccccccccccssecssecesseceseeceseeesseecsaecesseesseeesaeeesaeseeeeeseessas 7 00 DON T FORGET TO SPECIFY EXACT MODEL S ____ SPECIAL 2 REPORTS You save 4 00 c ccccssessessseeeeees 10 00 MAKE MODEL 1 _ o O O 3 4 ALTERNATE CHOICE S Please include alternate model in case no data available for first choice If you have no alternate this portion of your order payment will be refunded or credited NOTE Base amp mobile CBs only No Reports for any walkie talkie or Ham rigs HR2510 RCI2950 etc ____ CP BEAM ANTENNA Complete 13 page construction Plans cccccccsssssesssseeeeeeeeeeeeececesssessesaaeauaeseeeeeeceeesseesesessaeeeeeees 10 00 CHANNEL GUARD IF INTERFERENCE FILTER _____ For 455 KHz AM or FM dual conversion models Most 23 amp 40 Ch PLL amp crystal types Not for SSB US ccceeeeeseeeessteeees 32 00 ____ For 7 8 MHz SSB models Older 40 Ch Cobra Uniden Toshiba amp NDI PLL types most 23 Ch crystal types cccsseeeeeeee 32 00
4. ____ For 10 695 MHz SSB models All PLLO2A amp uPD2824 PLL all Galaxy RCI Superstar amp other Uniden clones 32 00 _____ SPECIAL Any two CG filters You Save 4 00 ccc cccccccessseeeeeeeeeeeeeceessssssseaaaeeeeeeeeeeeeeeesesseeseesenaeees 60 00 IMPORTANT Please specify exact radio model to be used with CG filter DYNAMIC SPEECH PROCESSOR Complete kit All parts wires PC board detailed assembly amp installation iNStrUCtiONS cccccccccsesesssssseceeeeeeeeeeeeeesesesssssaaeeeeeeeeeeees 36 00 Complete construction plans PC board only You supply all other parts NECCE cccccccceesssssessseeeeeeeeeeeeeeeeeesessesesaaeeeeeeeeeeess 10 00 LINEAR RF AMPLIFIER Complete 28 page construction plans Everything you ever wanted to Know cccccceeseeres 15 00 PC board only Etched drilled double sided heavy 2 oz copper laminate extra PCB 15 each Limit 5 boards cceeeeeeeees 20 00 EXPANDER 160 CRYSTAL OSCILLATOR amp SWITCH Complete kit All parts except crystals amp switch wires PC board detailed assembly amp installation instructions 25 00 Complete construction plans PC board only You supply all other parts needed ccccccceessesesseeeeeeeeeeeeeeeeeessssesssteees 10 00 EXPANDER 240 ELECTRONIC CRYSTAL SWITCH Complete kit All parts except crystals amp switch wires PC board detailed assembly amp inst
5. e Buffered oscillator output prevents possible loading effects PURCHASED SEPARATELY e Wide range crystal trimmers allow exact frequency adjustment e Remote diode switching eliminates the problem of stray capacitance found in long wire runs to mechanical switch boxes e Simple construction High quality PC board with screened parts overlay and solder mask Kit includes all parts and wires except crystals and switch plus detailed assembly and installation instructions e For all 23 or 40 channel PLL CBs using a loop mixing circuit Includes HD42851 LC7110 LC7113 LC7120 M58472P M58473P MB8719 MB8734 MC145f06 MM55116 MC14568 MSC42502P MSM5907 NDC40013 NIS7261A NIS7264B PLLO2A RCH8719 REC 86345 SM5104 SM5118 TC5080 TC9102 uP D858 AM only uP D861 uP D2814 uP D2816 uP D2824 NOTE Some ofthese PLL circuits only require the crystal switching function and will also work with the EXPANDER 240 Total bandwidth depends upon radio circuitry EXPANDER 240 Electronic Crystal Switch For all PLL type CB radios using a simple crystal local oscillator in the synthesizer mixer circuit Also for 23 channel crystal synthesized radios The EXPANDER 240 has all the features of the EXPANDER 160 but without the oscillator function not needed for many conversions and now with 6 crystal positions This saves you money and simplifies modifications in radios that don t require an external oscillator signal Examples all 23 channe
6. HB870AAFS Midland 7001 export Mongoose 2000 Nato 2000 Pacific 160 Palomar 2400 5000 Starfire DX Superstar 2000 2200 Thunder 2000 Tristar 747 777 797 848 Written by Lou Franklin this is the only manual available Complete specs voltage measurements theory PLL charts alignment instructions and layout block diagram Large 11 x 17 schematics for each chassis For UNIDEN 26 page book includes PBO1O chassis Cobra 148GTL DX President RICHARD Superstar 360FM PC999 GRANT and PB042 JACKSON in one complete book Also applicable to Stalker 9FDX export and President Uniden AR144 type chassis Written by Lou Franklin this is the only manual available Complete specs voltage measurements stage gain measurements theory including detailed PLL description complete alignment instructions and layouts block diagram Special addition describes modifications and improvements Large 11 x 17 schematics for each chassis SEE ORDER FORM FOR PRICES UNIQUE CB BEAM ANTENNA IMPROVES SKIP amp GROUND WAVE SIGNALS As featured in the J une 1980 issue of S 9 HOBBY RADIO Now you can have the best of all antenna worlds vertical polarization horizontal polarization and everything in between automatically and with no switching Circular Polarization CP for CB has arrived Not available commercially Build your own while saving money and improving your communications range and antenna knowledge FEATURES e Improved performance
7. Inc RCI and based on the original Uniden PB010 export chassis described in our UNIDEN EXPORT SERVICE MANUAL Those they didn t actually make are Chinese or European oopies using identical circuits and often the same parts numbers Study this one book and you ll understand all of them Main chassis EPT3600 10A 11Z 14B includes Alan 87 Cherokee CBS2100 NR100 NR150 Connex 3300 3500 Dirland 3300 3500 3600 3700 3900 Eagle 2000 Excalibur base Excalibur Samurai Galaxy 11B Galaxy 2100 Galaxy Il Galaxy DX33 DX44 DX55 DX66 DX78V DX77 DX88 DX99 Galaxy Melaka Galaxy Pluto Galaxy Saturn Galaxy Sirius General Lee Mirage 44 Mirage 6600 Mirage 88 Mirage 9900 Mirage II Mirage III Northstar 3000 4000 6000 9000 9500 President Franklin Super Galaxy Superstar Grant Superstar 3300 3500 3600 3900 May be others Main Ranger chassis EPT6900 10Z includes Cobra 148FGTL DX Connex 4400 4800 Galaxy DX2517 Ranger 99 RCI2960 RCI2980 RCI6300 May be others Main Ranger chassis EPT0696 10Z includes Galaxy DX949 DX959 DX2547 Texas Ranger 396 399 696 699 900 series May be others Also useful for understanding amp comparing to main Ranger and other clone chassis in Eagle 5000 Euro 3900 Galaxy 22B Galaxy 2527 Galaxy Saturn Turbo Mirage 2950EX Mirage 2970EX RCI 2950 2950DX 2970DX 2980 2985DX 2990DX 2995DX 6900 Sommerkamp TS2000DX The TX amp RX circuits on the main chassis are near
8. Since CP receives all polarization angles it doesn t matter what happens to the other station s signal on its way to you And when transmitting the fact that your signal contains all types of polarization increases your chance of being heard by both local and skip stations Finally add to this the 7 dB beam effect This is equivalent to a five fold power increase A 4 watt CB sounds like 20 watts Our plans include full details on mechanical assembly matching element dimensions etc And you ll also get information on building a second type of CP antenna as well as a 3 element Yagi beam antenna That s three antenna plans for the price of one BOOST YOUR TALK POWER AND RANGE Blow Their Ears Off With DYNAMIC SPEECH PROCESSING AFTER PROCESSING BEFORE PROCESSING jaa PEAK PEAK Ly yi Hy Bly Midd Ever wonder why those Rock N Roll radio stations always seem so loud Or why TV commercials seem to be louder than the program itself The reason is because smart broadcasters use exactly the same modulation processing that s now yours in this simple add on device You won t find this circuitry in the average radio it would cost a lot more And the sophisticated design requires too many parts to fit inside a power mike Your voice only modulates a transmitter about 30 on the average So during a one minute transmission you re really only hitting full RF power output for about 20 seconds the other 40 seconds are wasted
9. esr amp RCI 8719 SSB Sato AN sleepy PD2814 2816 AM NDI SSB early TCS080 SSB tie a NDI SSB late TC9106 9119 AM amp FM uPD2824 SSB PLLO2A AM 2 xtal TC9109 LC7132 MB8733 C5121 PLLO2A AM xtal PLLO2A SSB U S amp export Plus special diagrams for the Cobra 148GTL DX Realistic TRC459 and Uniden HR2510 chassis This is the only reference especially written to include non technical people and serious repairmen Professionally typeset bound and illustrated the big new International Edition covers all the most popular classic PLL circuits Plus all the very latest state of the art devices in C4B use worldwide Don t be left guessing learn the tricks of the trade now This is must reading for every true CB hobbyist or serviceman Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com Build it The TRIF POWER Broadband Mobile RF Linear Amplifier Construction Plans Completely Rewritten amp Redesigned for the 2000 s amp Beyond Easier to build than ever Optional PC board now available too We ve had plans for RF amps in our catalog since 1979 Now we ve finished the first major revision since then and we re really proud of it The original amp plans were certainly OK and worth the low price Thousands were sold and people liked them But we re always trying to improve our stuff T
10. every PLL device used old or new Includes U S U K and European chips plus manufacturers cross references Specific lists of every known CB radio using a particular PLL chip grouped by chip type and chassis type All the latest U S and export radios included In THE CB PLL DATA BOOK you ll have all available information at your fingertips for the following PLL devices C5121 M58473P NDC40013 TC9100P CC13001 MB8719 8734 NIS7261A TC9102P CC13002 MB8733 NIS7264B TC9103P HD42851 MC14526 MC14568 PLLO1A TC9106P HD42853 MC145104 PLLO2A TC9109P KM5624 MC145106 PLLO3SA TC9119P LC7110 MC145107 PLLO8A uPD858C LC7113 MC145109 REC86345 uPD861C LC7120 MM55104 114 124 SM5104 uPD2810C LC7130 MM55106 116 126 SM5107 uPD2812C LC7131 MM55107 SM5109 uPD2814C LC7132 MM55108 SM5118 uPD2816C LC7135 MN6040 MN6040A SM5123A uPD2824C LC7136 37 MSC42502P SM5124A LC7185 MSM5807 SM5125B M58472P MSM5907 TC5080P Also included is a unique section of specially prepared PLL chassis diagrams These are simplified illustrations showing exactly how a particular chip is used to generate all IF frequencies downmix frequencies Clarifier and SSB offsets etc Easier to understand than the manufacturers own service manuals Covers all the most common chassis including CPI 300 400 2000 PLLO3A 08A AM amp FM uPD858 AM 2 xtal LC7120 AM amp SSB REC86345 AM uPD858 AM 3 xtal LC7130 31 35 36 37 AM amp FM SM5104 SSB uPD858 SSB LC7131 SSB SM5123A uPD861 AM ROM
11. further understood by reading and studying our TUNE UP and MODIFICATION REPORTS or THE CB PLL DATA BOOK Shown below is a very small sample of the list MODEL PLL CHIP MODIFIABLE Y N SAMS FOTOFACTS Cobra 148GTL DX early PC 879 MB8719 yes n a Cobra 148GTL DX late PB010 MC145106 yes n a Cobra 148GTL DX fake PCMA001S PLLO2A yes n a Cobra GTL150 PLLO2A yes n a Cobra 1000GTL uP D2816 yes 235 Cobra 2000GTL MB8719 MB8734 yes 251 Colt SX33 PLLO2A yes 257 Colt 210 LC7131 no 292 With the MASTER LIST you ll know in advance which radio is suitable for modifications before you or your friends buy it If you service CBs this will be a great help that your customers will appreciate If you re about to buy a new one yourself you ll know exactly what to avoid Attention Hams Don t go to that next flea market looking for a 10 Meter CB candidate without your copy of the MASTER LIST handy Otherwise you might end up with a bargain that wasn t The MASTER LIST includes virtually every 23 and 40 channel American PLL model and nearly every export model that s ever been used here Plus many of the standard European models Currently over 1 000 listings SEE ORDER FORM FOR PRICES CB SOURCES SUPPLY LIST The question most often asked by our mail customers is Where can I find Fill in the blank with just about anything related to electronics or CB Radio It seems most people just don t know where to start looking for the radio supplies they
12. methods plus tips on Improving them IF troubleshooting Detector circuits ANL circuits AGC circuits AGC troubleshooting The S Meter circuit Noise Blankers NB troubleshooting FM detector circuits FM receiver troubleshooting Squelch circuits Squelch troubleshooting Scanning circuits Selectve calling The audio amplifiers Audio troubleshooting LED channel displays and bar graph displays Delta Tune circuits Tone controls Receiver alignment procedures and equipment set up Plus much more CHAPTER 5 TRANSMITTER CIRCUITS The RF amplifier chain Oscillators mixers and buffer stages Power amplifiers Classes of amplifier operation Biasing methods Vacuum tube power amps Power doubling methods Power reduction methods Coupling and filtering AM and FM modulation methods Speech processing Mikes and mike problems Limiters and compressors Measuring and adjusting modulation RF Power Meter circuit Modulation meter circuit SWR Meter circuit Antenna Warning circuit Roger Beep Oscillator circuit CW keying circuit Selective calling circuit Transmitter alignment procedures and equipment set up Plus much more CHAPTER 6 SINGLE SIDEBAND CIRCUITS SSB characteristics pros and cons SSB signal generation The Carrier Oscillator Carrier and synthesizer offset methods The speech amplifier The Balanced Modulator BM troubleshooting Sideband selection methods SSB crystal filters The mixer Mixer troubleshooting Linear RF power amplifier
13. on skip signals e Improved performance in hilly areas or between tall buildings e Talk to mobiles vertical or bases horizontal or vertical CP WAVEFRONT automatically and without switching De LSI Maven Las DS OF GAIN IN ONE DIRECTION e 3 element beam design gives 7 dB gain over a dipole TRANSMITTING e Simple construction with common materials Detailed non technical ANTENNA BASE BEAM assembly and tuning instructions ig E f h Circular Polarization CP is an idea borrowed from FM and TV SOOT broadcasters who were faced with the problem of getting out to both 4 HORIZONTAL cars vertical and homes horizontal CP is basically a rotating COMPONENT twisting radio wave containing properties of all polarization angles VERTICAL including all those in between vertical and horizontal Such as skip COMPONENT signals signals from moving mobile whips or signals bounced off hills or buildings Regardless of the antenna type used most CB signals oem MOBI os BUILDING oe amp MOST change their polarization as soon as they bounce off an object With CP BASES it doesn t matter You ll get out better and hear better even if the other HORIZONTAL amp VERTICAL COMPONENT station 1s using a conventional antenna een ee ere The other big advantage of CP is its elimination of multipath fading You ve probably experienced this as ghosts on your TV set when an airplane passed overhead Or as fading when talking to a moving mobile
14. simple the best I ve read CW Scottown OH was a big help to me the easiest one to understand and read worth paying that cheap price RN Honolulu HI 1S one of the very best and very easiest on the subject you get the information across MP Argyle MN found your book very interesting and helpful in understanding CB radio problems DM Wheaton MD It has proved to be quite useful TK Holly MI simply bodacious Your book is of great value to me OE Ontario CA the most important item anyone could add to their radio shack To you sir Well Done and thanks LL Las Cruces NM little more than expected A real fine book by far EM Beeville TX recommend this book to every CBer It has helped me in all ways HK Netherlands Antilles great fantastic there is someone who can explain a technical subject in a non technical way LH Rialto CA the best most informative to the point book I have found on CB basic repairs RR Jacksonville OR the best publication have ever seen Thank you very much for a job well done WGB Collinsville IL one of the best ever done to explain to a novice repairman how to fix his own equipment Maybe can avoid being ripped off by some first class know it all RSS Rockford IL was just the thing needed Took all kinds of courses but this one was the one that did it Thank you RBH Bolivar PA very very informative and very helpful APT Pittsb
15. technical library has specific tune up peaking and modification information for nearly all CBs We ve probably got something you need on 95 of all American models plus many of the more popular foreign and export models That s over 1500 CBs from rare old tube types to all the most common and popular crystal and PLL rigs Learn how to get maximum receiver sensitivity RF transmitter power output modulation and range from your AM or SSB rig by simple adjustments No electronic knowledge required and you use the radio s own S RF panel meter or an inexpensive SWR meter for tuning Our T M Reports also include mike wiring and crystal or PLL information for each specific model All of our CB TUNE UP and MODIFICATION REPORTS are written in the same no nonsense plain language style that has already made THE SCREWDRIVER EXPERT S GUIDE the authority on do it yourself repairs In these reports we show only the main adjustments for transmit power modulation and receiver sensitivity no guessing at which controls and which parts do what And each T M Report is specially prepared just for you Includes e Parts layout showing where to find the main adjustments for receiver sensitivity and AM or SSB power output and modulation Includes simple tuning instructions e Basic description of the rig s PLL or crystal synthesizer Helps you find dead channel problems or modify your CB for extra frequencies Detailed simple explanation of PLL channe
16. the result is 34 765 MHz 14 265 MHz 20 500 MHz at the output of the SUPER EXPO Mixing this 20 500 MHz with the 7 8 MHz IF gives you 20 500 MHz 7 8 MHz 28 300 MHz again We ve designed the SUPER EXPO for maximum parts and circuit flexibility You can choose several configurations 1 Straight 160 or 92 channels 40 or 23 channels per mixing crystal 2 120 or 69 channels T R repeater offset for 10M FM use 40 or 23 channels per crystal in 3 bands plus one offset band of 40 or 23 channels 3 A straight 80 channels for the impossible AM type rigs using the LC7131 or TC9106 PLL one crystal needed for each mode RX and TX resulting in 40 channels for each of the 2 crystal pairs The SUPER EXPO is powered from a regulated 7 10 VDC source in the radio Current drain is a tiny 13 ma 8 VDC There are only four wire connections to the radio VCO SYNTH IN RF OUT DC DC A fifth wire would be connected to a TX only voltage source if you plan to use the T R split feature Dimensions are 21 2 x 3 The quality PC Board has a solder mask and a printed parts legend for easy assembly Complete kit contains all parts The 16 page instructions include circuit theory crystal calculations and suppliers hookup examples for many popular PLL and crystal CB radios schematic parts list and layout installation and alignment troubleshooting hints and more Just order your crystals stuff the board and go NOTE Crystals are not incl
17. want or need Look no more We ve created a special list by category just for you Our CB SOURCES SUPPLY LIST helps you find CB and Ham equipment and related electronic supplies quickly and easily Some of the listed names will even direct you to more detailed lists You ll find almost anything here for your radio shack We ve used many of these firms personally so we know they re reliable well stocked and have good mailorder prices And we ve included toll free 800 numbers where available to make your shopping even easier Get your copy today Here s a summary of the main categories CB Equipment Retail CB Equipment Wholesale CB Radio amp Antenna Manufacturers CB Specialties amp Accessories Ham Radio Equipment Japanese ICs amp Transistors Tubes amp Antique Radio Supplies Electronic Parts Surplus Electronic Parts New Test Equipment New Test Equipment Surplus Electronic Books amp Magazines Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com ORDER FORM We accept VISA MASTERCARD on orders over 25 Please mark desired items and quantities at left Make sure total on other side agrees with the items you check here ____ THE SCREWDRIVER EXPERT S GUIDE TO PEAKING OUT amp REPAIRING CB RADIOG cccccceeeeeeeeeeeeeeeeeteeeeees 25 00
18. 1 5 This is the total amount to be enclosed or Charged u cccccccscccccceecceeeeeseeeeeeeeeeeeeeeeeeeeeeeees NOTE 25 minimum for credit cards FAX your VISA MC order ss PLEASE PRINT IN DARK INK ESPECIALLY FOR FAXes 888 434 9227 520 298 7980 NAME E MAIL ADDRESS CALL SIGN CITY STATE COUNTRY ZIP VISA MASTERCARD EXP DATE IMPORTANT Print the cardholder s name you a parent a friend etc exactly as it appears on the VISA or MASTERCARD Mail to CBC INTERNATIONAL e P O Box 30655 Tucson AZ 85751 U S A Email orders cbcintl com L_ Check here if you d like to be on our Email list for future product information Is this your first order If YES how did you learn about us Magazine which one Friend On The Air M 72 THANK YOU FOR YOUR BUSINESS NEW CATALOG SENT WITH EVERY ORDER
19. 4th mixing crystal Or two full bands on the two middle crystals and two partial bands on the end crystals depending on where you set the VCO and mixer tuning stages Listed below are many common radios by chassis type and which kit to use If your rig s not on this list send us a stamped self addressed envelope SASE or E Mail message with the exact model number We ll tell you what if anything can be done to it EXPANDER 160 1 Any 23 channel crystal rig But only 12 extra channels where the EXPANDER 240 would get you 20 extra channels 2 Any PLL rig using the 15 360 MHz loop tripler mixing scheme Chips with this method include the LC7120 SM5107 uPD858 AM 2 crystal scheme only uPD861 uPD2810 uPD2812 uPD2814 uPD2816 and uPD2824 SSB 3 Any late Cybernet PLLO2A AM PLL chassis using the 2 crystal scheme of 10 240 MHz and 10 695 MHz In this circuit the 10 240 MHz PLL reference signal is doubled to 20 480 MHz and you would replace that signal 4 Any other PLL rig using a mixing signal that s not directly derived from a separate mixing crystal For example all NDI SSB rigs SBE Sidebander IV V Console V Console VI Johnson Viking 4730 Messenger 4730 Pace 1OOOMC BC etc use a 10 MHz PLL crystal reference and part of that oscillator signal 1s sampled off and doubled to 20 MHz to use for loop mixing In those rigs you d inject your own new signals in the 20 21 MHz range using an external oscillator EXPANDER 240 1 All 23 c
20. By mixing this signal with a crystal oscillator of say 22 725 MHz you get a mixing product of 16 270 MHz 22 725 MHz 38 995 MHz at the output of the SUPER EXPO When you mix this product with the 10 695 MHz IF of the radio the result is a totally new Ch 1 carrier frequency of 38 995 MHz 10 695 MHz 28 300 MHz in the 10 Meter band Just choose the crystals for the frequencies and or splits you want TYPICAL CONNECTION IN PLL CB RADIO TYPICAL CONNECTION IN CRYSTAL SYNTHESIZED CB RADIO Break YOO output path at paint A Break Synth output Usually ay Sale path at point lt A uSualh 156 17 NHs or 4 36 MHz HH Usuall ATAL EI Couple YOO output into Couple Syalh output inte SUPER EXPO instead l SUPER EXPO Instead In In r E E E E E E E r Se _ 24 SUPER EXPO 1 4 SUPER EXPO i a AEE eel 22 Sol aa am owl x34 T TIR Cea Couple SUPER EXPO ENEA Couple SUPER EXPO cd laptionall output te common Input i D output to common Input SS point of TX amp RX Mixers L point of TX amp RX Miers EXAMPLE OF CRYSTAL RADIO MODIFICATION Johnson Viking 352 Midland 13 893 13 895 Pace 1000M 1000B These excellent old SSB rigs used banks of 8 MHz and 11 MHz crystals in a very complicated synthesizer circuit That doesn t matter The IF is 7 8 MHz and the Ch 1 USB synthesizer output is 34 765 MHz By mixing this with your local crystal of say 14 265 MHz
21. SINCE 1976 OUR BIG DUMMY S MANUAL OF CB REPAIR HAS HELPED THOUSANDS Fantastic The best I ve read and I ve read at least 40 books by so called experts Mr F D G Odessa TX Learned more from your book in one hour than 3 weeks in electronics school Mr L A Lisbon OH You can repair 95 of all CB radio problems yourself with NO ELECTRONIC knowledge and NO expensive special test equipment Just let my simple book THE SCREWDRIVER EXPERT S GUIDE ll hand SCREWDRIVER Let me introduce myself My name is Lou Franklin and am a EXPERT S GUIDE professional electronic repairman with 35 years experience in the Lon Femaklin aap design and repair of radio communications equipment hold the highest grades of FCC licenses issued by the U S Government ant NEW Yo oe INTERNATIONAL 1 General Radiotelephone formerly First Class Commercial with EDON Radar endorsement The one most repairmen wish they could a pass the test to get Fa ts 2 Amateur Extra Class K6NH Only 6 of all Ham operators can pass this test around the world including 100 000 watt 6tower AM FM arrays Sige ta ct have helped build repair and maintain commercial broadcast stations have outlasted almost all my CB repair competition because quite J Za frankly am among the best the fastest and the most honest CB Hh technicians around have travelled the truck stops of America repairing the repairs of all the othe
22. VE MONEY Help cut our paperwork and get a 15 discount for cash payment Cash means exactly that cash We ve been in business since 1976 and some people ask for this We accept paper only in US or equal foreign exchange paper in C A NZ UK DM FFr SFr HFI J ATS SAR PLEASE DON T SEND COINS Round up Line 6 total to nearest whole dollar Wrap in foil for added security No discount for Money Orders or Cashier s Checks If you re not comfortable sending cash use any of the other methods above at the full price The U S Postal Service is still the most reliable in the world and First Class letters are rarely lost IMPORTANT We are book sellers not book keepers We know you re anxious to get this stuff but things like math mistakes missing or invalid credit card numbers and unreadable handwriting or FAXes will delay your order When they happen we must return your letter or FAX so it takes that much longer to mail us back your corrected Order Form Please follow all instructions carefully 1 Total cost for items Checked ON Order Form ccccssccceessseeeeeseeeeeeessceeeeecescneeeeesssneeeeessneeeeesssceeeeeesseeeesesssnaaeeesssneeeeess 2 Subtract 15 discount if sending cash NOTE Cash means exactly that Green Stamps only 0 3 Subtract any previous Credit Memos enclose your original with this Order cccccceeeeeescecceeeessseeeeeeeeeeeeeeeeeeeeeeeeeeeeees 4 Arizona residen
23. Y TO UNDERSTAND REFERENCE GUIDE TO CB PLL CIRCUITS YOU LL EVER NEED COMPLETELY REVISED AND EXPANDED TO INCLUDE ALL THE LATEST CHIP TECHNOLOGY J 812 x 11 Softcover 88 pages 43 illustrations 10 charts ISBN 0 943132 05 3 Now you don t have to be an electronic genius to understand PLL synthesizer circuits and frequency modifications Using the same clear non technical writing style that made his classic book THE SCREWDRIVER EXPERT S GUIDE so popular author Lou Franklin unravels the mysteries of the PLL circuit for both beginners and professional repairmen Become a PLL expert the lazy man s way We ve combined hundreds of CB models and years of PLL experience into a single handy reference source How can unlock the PLLO2A for more channels What s the function of Pin 9 on the LC7131 Which radios are the easiest and hardest to convert The answers to these questions and many more are all here FEATURES How the PLL works Simple but detailed text and illustrations all carefully prepared and written for the average person How to modify the PLL for many more channels or the 10 Meter Ham band How the PLL is used for the SSB slider shift and for FM transmission How and where the PLL provides all the required mixing signals for CB operation How the major CB manufacturers easily convert 40 channel American rigs into export models which often have up to 240 channels Pin by pin functional description for nearly
24. allation instructions 20 00 Complete construction plans PC board only You supply all other parts needed cccccceessssesseeseeeeeeeeeeeeeeeessssssssaees 10 00 SUPER EXPO CRYSTAL OSCILLATOR SWITCH amp MIXER Complete kit All parts except crystals amp switch wires PC board detailed assembly amp installation instructions 30 00 Complete construction plans PC board only You supply all other parts needed cccccseessesesseeeeeeeeeeeeeeeeeesssssessseaeees 10 00 GALAXY RANGER RADIO SERVICE MANUAL 0 cccccccccccccccssssseeeeeeecessesaseeeeeecessaaeeeeeeceeseaaeeeseeceseesaseeeeeecesseaeeeeeeeeses 25 00 UNIDEN EXPORT RADIO SERVICE MANUAL 0c cccccccsscssssssssccsssesssascsscccscesssenssaceeseesusansscaessansuaussscneseansuansusanesaasenansuaasene 25 00 CYBERNET EXPORT RADIO SERVICE MANUAL ccccccccccccessssseeeeeecessesaeeeeeeeeessesaeeeeeeecessaaeeeeeecensesaaeeeeeecesseaeeeeeeeesns 25 00 TECH SPECIAL All 3 service manuals You Save 10 00 ccccccccsscceeeeeeeeeeeeeesssssssseaeeeeeeeeeeeees 65 00 THE MASTER LIST OF PLL MODELS IC CHIPS USED MODIFIABILITY et 0 0 00 ccccceeeeeeeesssseseeeeeeesssseeeeees 10 00 CB SOURCES PARTS LIST CB manufacturers wholesale retail dealers new surplus parts books magazines 10 00 4 7 WH RF CHOKES Put in series with Clarifiers varactor diode to increas
25. ame radios that can currently use our EXPANDER 160 or EXPANDER 240 kits as well as the 23 channel and more difficult PLL models For many radios our simpler kits will do When deciding which kit to buy you should consider things like price size ease of construction and installation available test equipment technical experience and your need for T R splits Manufactured by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com Now Includes Even MORE SERVICE MANUAL gx Second Edition ae Y Second Eton The latest edition of our service manual for these popular Galaxy and Ranger radios has been expanded to cover even more models No more fuzzy photocopies of schematics that you can t read no matter how large No more guessing about all the other essential technical information you must have like voltage measurements PLL and circuit theory block diagrams scope photos alignment procedures and much more This expanded new 32 page book was completely written and illustrated by Lou Franklin in his famous crystal clear style The schematics are all redrawn for greater clarity in 11 x 17 sizes with active stages and trimmer adjustments plainly labelled and part numbers converted to the American style 047UF instead of 473M etc Most of the models listed below were made by Ranger Communications
26. cies for each mixing crystal you choose This means a possible total of 4 x 23 92 channels from these great old high performance rigs The reason is because you only need to sample from the composite synthesizer output signal that results from mixing all those crystals Just like a PLL s VCO output The SUPER EXPO has no effect on the PLL or crystal synthesizer circuits themselves and these continue to work normally This includes the Clarifier circuit you can modify that just as you normally would if the SUPER EXPO wasn t there So you can stop worrying about things like out of lock conditions accidentally blowing up an obsolete PLL chip realignment of the PLL or crystal synthesizer or upsetting the alignment of the USB LSB offsets Why Because you are connected externally to the synthesizer circuit This greatly simplifies many installations Finally many popular PLL SSB rigs like the Cobra 138 139XLR use separate mixing crystals one each for AM USB and LSB Which meant you had to change all three of them if you wanted to keep all modes The SUPER EXPO solves this problem because each mode s carrier frequency is generated inside the loop and you never touch the inside of the loop EXAMPLE OF PLL MODIFICATION Newer radios like the Courier Galaxy V Galaxy VI and Midland 79 265 use the LC7131 PLL chip in a single crystal 10 240 MHz circuit Not easily modified until now The IF is 10 695 MHz and the Ch 1 AM VCO is normally 16 270 MHz
27. cy modification kit is perfect for all your HF applications It consists of a local oscillator which can switch up to 4 crystals of your choice a mixer stage and an offset circuit for 10 Meter repeater splits or other duplex operation Each mixing crystal will generate a complete 23 or 40 channel band and is fully adjustable with trimmers See the Block Diagrams below To modify frequencies you i ds ee k no longer have to change the program coding or inject new Gey 7 wt mixing signals inside a PLL circuit often with complicated retuning procedures Instead it s now as easy as 1 2 3 First break the PLL s VCO signal at the output side where a common PC trace or coupling capacitor in the radio leads to SHOWN ACTUAL SIZE the Receive Mixer and Transmit Mixer stages Then connect the PLL side of the break to the input of SUPER EXPO Last connect the output of the SUPER EXPO to the other side of the break The a oscillator in the SUPER EXPO will mix PLANS PC BOARD MAY BE with the radio s VCO to generate a totally new injection signal PURCHASED SEPARATELY This new signal when applied to the radio s RX and TX mixers will change the transceiver s operating frequency The right hand Block Diagram shows that the SUPER EXPO will also modify crystal synthesized CBs without having to change a whole bank of crystals Doing that would still give you just 23 new frequencies Instead you ll now get an entire 23 channel band of frequen
28. e slide range up to several KHZ 000000 5 pack 7 00 470 H RF CHOKES Great for general RF filtering Kills RF feedback amp squeal when nothing else WOrKS cccceeeeeee 5 pack 7 00 TOLL FREE VISA MC FAX ORDERS 888 I FIX CBs 1 888 434 9227 Local 520 298 7980 Email Questions orders cbcintl com Secure Web Order Form https www cbcintl com secure htm M 72 FILL OUT AND MAIL TODAY SATISFACTION GUARANTEED ORDERING INFORMATION CBCI has no control over the technical skill of the purchaser nor the end use of our products or information CBCI assumes no liability for improper or illegal use or improper construction or installation Exchanges made only for defects or shipping damage We only repair our own kits as noted in the kit s construction plans and we do not accept shipments of non CBCI items for repair Our plans always include sufficient service data All CBCI books and plans have an unconditional money back guarantee less shipping cost if not completely satisfied Note however that all hardware sales are final no refunds credits or exchanges Payment Full payment in U S funds with order We accept cash Money Orders Cashier s Check or VISA MASTERCARD No foreign checks accepted Personal checks will delay shipment up to 10 business days to clear your bank Large or quantity orders sent UPS or Priority Mail at our discretion Prices subject to change without notice Sorry no C O D or billing SA
29. energy Here s why almost all of the voice power is concentrated in the consonant sounds B K S etc The vowel sounds A E I O U contain very little average power and can cause high intensity peaks which easily overmodulate a transmitter causing channel splatter and bleedover Also voice frequencies below 500 Hz and above 3000 Hz contain little NEW TRANSMITTER ACCESSORY power and don t really improve voice communications By using our IS CHEAPER amp MORE EFFECTIVE DYNAMIC SPEECH PROCESSOR the unwanted frequencies are reduced while a THAN ANY POWER MIKE the same time the high intensity peaks are clipped off The scope photos show how the DSP effectively raises the average power relative to the peak power The result is PLANS amp PC BOARD MAY BE a dramatic increase in perceived loudness by the listener to about 90 average PURCHASED SEPARATELY modulation Now you re running at your full potential RF power output almost all the time And the best part is that proper adjustment of the DSP output eliminates overmodulation and channel bleedover while letting your voice punch through LOUD FEATURES e 6 dB improvement one S unit in AM SSB audio power with little or no distortion Improves communications during heavy interference or weak signal conditions e Prevents overmodulation bleedover while maintaining extremely high average modulation Over 30 dB of dynamic range is compressed to modulation levels averaging 90 e
30. equipment you ll need Inexpensive testing aids you can build yourself Additional information sources Includes a complete shopping section for CB radios antennas parts accessories and test equipment including names addresses and 800 numbers Plus much more CHAPTER 2 BASIC TROUBLESHOOTING TECHNIQUES Block diagrams teach you theory of AM and FM receivers and transmitters Use of the systematic approach Testing semiconductors Signal injection and signal tracing Intermittents Interpreting DC biases Transistor amplifier circuits Understanding device markings Plus much more CHAPTER 3 GENERATING THE SIGNAL FREQUENCIES Crystals and crystal oscillators Series and parallel resonance The Colpitts Oscillator Overtone oscillators Oscillator troubleshooting How to order crystals Walkie Talkies The VFO Crystal and PLL synthesizers Elements of the PLL system How digital dividers work Generating the binary and BCD channel codes ROM programming Additional PLL functions Expanded coverage synthesizer methods Broadbanding methods Evolution of the PLL using several examples PLL alignment procedures and equipment setup PLL troubleshooting methods The MB8719 synthesizer Includes 23 channel crystal mixing charts covering 90 of all AM CBs use these to quickly determine dead channels or 10 Meter Ham conversions Plus much more CHAPTER 4 RECEIVER CIRCUITS RF and IF Amplifiers Mixers Single vs dual conversion methods IF selectivity
31. exposed at last My personal experience in repairing over 2 000 CB radios has shown that about 75 of all problems are not even in the radio they re almost always caused by bad mikes and bad antennas Of the remaining 25 perhaps 20 of all internal problems are the result of reversing the power leads bad audio and transmitter Finals bad crystals and bad solder connections can show you exactly how to diagnose such problems how to physically locate and replace the defective part and where to get an inexpensive new part That leaves us with about 5 of problems requiring professional help and very expensive special test equipment It is for this relatively small 5 that the electronics industry spends a fortune pushing their high priced correspondence courses and vague theoretical textbooks Such products often emphasize troubleshooting methods and classic analyses for problems which rarely even occur in CB radios On the other hand I ve managed to boil down years of real practical CB radio situations into an illustrated manual that anyone of average intelligence can understand Electronics is a complicated science but you don t have to know how something works to be able to fix it That s why my information is totally unique you just need eyes common sense and the ability to carefully follow illustrated instructions One word of caution some of the repairs and adjustments that I ll describe may be illegal for you to perform without the p
32. g to his neighbor at the same time as you Many stations are overpowered and overmodulated and are guaranteed to make your operating miserable with splatter and bleedover Fed up with hearing the guy down the street ten channels away The CHANNEL GUARD will stop him cold We have two kinds of CHANNEL GUARD IF filters that will fit most popular crystal and PLL type radios 1 The 455 KHz version replaces the existing Murata ceramic filter Just unsolder the old filter install the CHANNEL GUARD leads in the empty INPUT OUTPUT GROUND holes and connect to 8 13 VDC You are done 2 The high frequency versions are specially designed for SSB rigs Simply remove the correct IF coupling capacitor install the INPUT OUTPUT leads and GROUND and connect to 8 13 VDC Detailed installation instructions included for both types Using the same idea as our popular 455 KHz CHANNEL GUARD the SSB filters combine an IF amplifier stage with two high Q crystal elements You install it at an early IF signal point before the signal branches off to the separate AM FM or SSB detectors The result razor sharp selectivity in every mode Since the Q Selectivity Factor of a crystal is many times higher than the normal tuned IF transformers the strength of interfering signals even slightly off the center IF frequency drop off very quickly Bleedover is greatly reduced See the Graph below I F Skirt Selectivity vs Center Frequency So Typical response
33. hannel crystal models 2 Any early Cybernet PLLO2A AM PLL chassis using the 3 crystal scheme of 10 240 MHz 10 695 MHz and 11 8066 MHz Here you d switch in new crystals to replace the 11 8066 MHz signal which is being tripled to 35 420 MHz anyway 3 All Cybernet PLLO2A SSB American chassis using the 10 0525 MHz mixing crystal or all export multimode chassis using a bank of mixing crystals in either the 10 MHz or 20 MHz range 4 All the MB8719 MB8734 PLL SSB chassis Replace the 11 1125 MHz or 11 325 MHz tripler crystal 5 All the uPD858 AM 3 crystal models These use 10 240 MHz 10 695 MHz and 36 570 MHz 6 All the uwPD858 SSB and SM5104 SSB models CAUTION This chassis uses 3 separate mixing crystals one each for AM LSB and USB Therefore the kit would only work for one mode That s fine for 10 Meter Novice conversions if all you care about is USB but for full CB expansion you d need three kits for all mode coverage Obviously not very practical 7 Realistic TRC448 Wards GEN719A same situation as 6 10 All Royce models with the sardine can type of sealed PLL unit These generally use a 36 MHz loop mixing signal and the specific PLL chip doesn t matter What does matter is that you d have to run the EXPANDER 240 switching wires into the sealed unit These wires would be longer than the normal kit mounting location and could cause oscillator instability 11 Realistic TRC459 TRC480 Change the 18 MHz mixing crystal 12 Any o
34. hat old amp was our first try at this and had a few problems like hard to find parts that made it tough for the average guy to build Boy we ve learned a lot since then Each of the three power options has been thoroughly tested The amp is now even easier to build using currently available parts Especially since we can also offer you the finished Printed Circuit Board ready to stuff and solder Hundreds of happy customers have already written to tell us how smoothly this new version went together and how well it works We ve beefed up the whole booklet too from 22 to 28 pages All professionally written and illustrated in a style similar to this page you re now reading Why settle for a few pages of illiterate junk from other so called publishers Get the real thing for the same price And as always you get the CBCI promise of Satisfaction Guaranteed The minimum cost to build a complete amp including our plans amp PC board is about 100 depending on the power transistors you choose how good you are at shopping for parts what parts you already have laying around etc This compares favorably to the typical 1 per watt price of ready made commercial amps if you could find them FEATURES e Broadbanded 3 30 MHz push pull design No tuning required after a simple one time setup procedure e Three power levels 60 100 120W 100 140 180W PEP depending on the transistors you install when building e Includes trimmer ad
35. justable input and output tuned circuits for perfect SWR matching Just set it and forget it e All mode operation AM FM CW SSB e Internal SWR protection with rugged Motorola transistors e Bias switching lets you choose the most efficient method for Class C AM FM CW or Class AB SSB operation e Carrier operated T R relay with separate drop out timing delays to automatically match AM FM or SSB operation e Switchable ON OFF operation with LED indicator e Jumper adjustable input network matches 410W RF drive levels for most popular low power HF transceivers e Transient spike protection in mobile use e Double sided PCB design uses extra heavy 2 oz copper laminate for excellent RF stability and voltage regulation Not Legal For 27 MHz Class D CB Use And it s illegal to sell ready made Linears or even amp kits in the USA Please don t ask us about them The plans include reliable parts suppliers for everything you ll need to complete this project and have great fun learning too Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com CB TUNE UP and MODIFICATION REPORTS SPECIALLY PREPARED JUST FOR YOU Here s a simple and inexpensive way to get the inside information on your CB before investing lots of time or money on a rig that may not have the capabilities you re looking for Our giant
36. l crystal synthesized radios Cobra 140 142GTL type Cobra 148 2000 2010GTL type Uniden Grant XL etc Other applicable PLL types include the CPI chassis HD42851 LC7110 LC7113 M58472P M58473P MB8719 MB8734 MC145106 MSM5907 NIS7161A NIS7264B PLLO2A RCI 8719 REC86345 M5104 TC5080 TC9102 uPD858 AM only models and uP D861 binary AM only models SHOWN ACTUAL SIZE IMPORTANT NOTES FOR BOTH KITS 1 Due to the large number of crystal frequencies and mounting possibilities the crystals and PLANS PC BOARD MAY BE the hardware switch are not included in either kit PURCHASED SEPARATELY 2 The following PLL circuits can t be modified with these devices C5121 LC7130 LC7131 LC7132 LC7136 LC7137 LC7185 MB8733 SM5123A SM5124A SM5125AM M5125B TC9105 TC9106 TC 9109 TC9119 3 Installation should only be done by a qualified technician with access to the radio s service manual or schematic IF UNSURE WHICH KIT TO ORDER SEND US AN EMAIL OR A LARGE STAMPED S A E AND THE EXACT RADIO MAKE AND MODEL Manufactured by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com SUPER EXPO Crystal Oscillator amp Mixer UNIQUE KIT MODIFIES 95 OF ALL PLL TYPE CB RADIOS INCLUDING MANY ROM CIRCUITS AND MOST 23 CHANNEL RADIOS TOO INCLUDES T R SPLIT CIRCUIT FOR 10 METER REPEATERS Our SUPER EXPO frequen
37. l modifications that you can often make using only a handful of parts or wires e For SSB radios how to strap over the Clarifier to slide in TRANSMIT mode too e Mike wiring connections No more guessing how to rewire a broken mike or how to install a new one Here s the perfect layman s guide for anyone who wants the maximum performance from a CB radio And how to get it without lots of previous electronic know how or expensive special equipment Even if you have no service information available you ll know what to do and how to do it for your CB model Order one today When ordering 1 Specify the manufacturer s exact name and model For example a name like Sears Roadtalker is totally useless because many Sears models are called Roadtalker Sears 934 3831 is the kind of detail we need 2 We do not have reports for Walkie Talkies or any 10M Ham rigs HR2510 HTX100 RCI2950 etc Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com EXPORT RADIO SERVICE MANUALS For CYBERNET 24 page book includes PCMAOOIS PTBM125A4X PTBM131A4X PTBM133A4X PTBM121D4X Known models Cobra GTL150 148GTL DX fake Colt 320FM 320DX 1200DX 1600DX 2000DX 2400 Excalibur Falcon 2000 Ham Int l Concorde II Concorde III Jumbo MI Multimode M HyGain 2795 2795DX 8795 V Intek 1200FM Lafayette 1800 2400
38. ly identical electrically the main difference is in synthesizer circuits Here s a Summary of all the useful information you ll find in our new GALAXY SERVICE MANUAL Second Edition Transceiver Specifications Master Frequency Channel amp VCO Chart Where to Find Parts Alignment Locations for EPT3600 EPT6900 amp EPT0696 Main Chassis e RCI 8719 PLL Truth Chart Parts Layout for EPT3600 EPT6900 amp EPT0696 Main Chassis Theory of Operation e Stage Gain Measurements Simplified PLL Mixing Diagram MC145106 amp RCI 8719 PLL IC Pin Diagrams e EP T6900 Active Filter Circuit Diagram EPT3600 Block Diagram e EPT6900 EPT0696 Block Diagram e Alignment Procedure Test Equipment Setups Understanding the CD4008 4 Bit Adder e CD4008 Truth Chart By Band e NJM4558D Internal Pin Functions General amp PLL Alignment Procedures Receiver Alignment Procedure Transmitter Alignment Procedure EPT3600 EPT6900 amp EP T0696 Voltage Measurements e RF Amp Chain Scope Photos At Each Stage EPT3600 Schematic Circuit Diagram EPT6900 EPT0696 Schematic Circuit Diagram Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com EXPANDER 160 amp EXPANDER 240 Application Notes Many people have asked about which expander kit is best for their particular application Let s try to clear this up Generally speaking any radio
39. of this book grfet Lou Franklin K6ENH SuperSparks 7 P S Please pass this information along to a CB friend or club And if you re already familiar with basic CB electronics and want to learn more check out our big advanced technical book UNDERSTANDING amp REPAIRING CB RADIOS Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com UNDERSTANDING amp REPAIRING CB RADIOS THE BIGGEST MOST AMBITIOUS CB RADIO BOOK EVER WRITTEN OVER 370 PAGES OF DETAILED THEORY amp TROUBLESHOOTING INSTRUCTIONS ILLUSTRATED THROUGHOUT WITH MORE THAN 350 PHOTOS CHARTS SCHEMATICS amp OTHER DRAWINGS COVERS ALL TYPES OF CB RADIOS e AM FM SSB amp CW e 23 amp 40 CHANNEL e CRYSTAL amp PLL SYNTHESIZED e TUBE amp SOLID STATE e AMERICAN BRITISH amp EXPORT MODELS ISBN 0 943132 24 X 384 pages with index 8 2 x 11 soft cover We ve had thousands of requests from happy readers for a more detailed technical reference that would pick up where THE SCREWDRIVER EXPERT S GUIDE leaves off And so I ve created the ultimate CB radio book Nearly four times bigger too It took more than three years and you won t be disappointed If you re a student of electronics a professional radio technician or retailer or just someone who takes his CB hobby seriously this book is for you This com
40. prehensive teaching manual is designed to help you solve any type of CB radio problem quickly and profitably As you know CB interest is on the rise again Combined with the new 10 Meter Novice Ham band this means thousands of CB radios will need service and repairs as well as qualified technicians to do the actual conversions Get the education you need to cash in on the boom You probably already have a knowledge of basic electronics that you got through work experience school a correspondence course or more general books But you could never seem to relate that knowledge specifically to CB circuits Look no further Starting with a detailed discussion of CB technical specifications and measuring equipment you ll be guided through various troubleshooting techniques and shortcuts This is followed by a thorough analysis of virtually every type of circuit found in CB radios from the classic 23 channel tube transceivers to the most modern multimode solid state models A big chapter on antennas their problems and installation tops it off Details on where to find specific parts accessories test equipment and more information are included throughout the huge text There s no complicated math or vague theory here just practical common CB circuits explained in the simplest possible way Here s a small sampling of the fact filled contents CHAPTER 1 INTRODUCTION TO CB SERVICING The new Surface Mount technology CB technical specs defined Test
41. r so called CB experts receive constant requests for technical advice from CBers all over the world ar clits le Eai r ae hi ia hy eae Repairs ano Doit aia bbe R i yoursoli MODIFICATIONS Ba PR oo i Winclone ABER GATS mai OPA PGA Ph There will never be a better time than right now for you to prepare yourself to cash in BIG on the booming CB radio repair business without wasting a pile of money on overpriced correspondence school courses and vague electronics textbooks Or maybe you just want to learn enough to fix your own equipment and enjoy your hobby more The popularity of CB is on the rise again due mainly to lower overall costs favorable sunspot conditions and a growing interest by Hams in 10 Meter conversions And CB is now a worldwide hobby with millions of radios in use People would still rather pay you 20 30 for a simple repair even on a bargain model than have to spend considerably more for a new set And they re definitely not going to throw away a top quality name brand model Finally don t expect those 23 channel sets to disappear for a long time since they re much easier to modify and tune than many of the 40 channel types they re still extremely popular with old timers as well as Ham operators who can convert them for Amateur use My book explains the pros and cons of both radio types as well as their modification methods l Il show you in non technical detail how to get those extra frequencies
42. roper commercial FCC license or under the supervision of a duly licensed technician All l m offering is the knowledge of how to do them This book is fully illustrated with drawings charts and schematics including things like e Color codes of most popular power mikes and how to wire them e Common crystal mixing schemes for determining dead channels e The most common audio and RF Final transistor types and how to recognize and replace them e How to locate the adjustments for peaking out the transmitter modulation and receiver sections of typical AM or AM SSEB rigs e How to convert many popular PLL radios to new frequencies by substituting crystals or by simple switching arrangements e Detailed SSB slider modifications How to make them shift for both Receive and Transmit Includes specific instructions for many popular chassis types e FM conversions How to add this very useful operating mode to most AM or AM SSB models Plus a unique Troubleshooting Flowchart This method is often used by the pros to quickly isolate a fault or problem MONEY BACK GUARANTEE If for any reason you feel this information isn t worth its purchase price return it to me within 30 days for a prompt refund no questions asked Ever wonder why those other CB mailorder book sellers never offer refund guarantees This book is professionally written typeset and bound in a large 8 x 11 format Over the years it s been reviewed in many electronic maga
43. s Biasing methods AM SSB power and modulation control ALC Testing the SSB transmitter SSB reception methods The Balanced Demodulator The Product Detector The Clarifier circuit Clarifier troubleshooting IF amplifiers SSB AGC methods SSB transceiver alignment procedures and equipment setup Plus much more CHAPTER 7 POWER SUPPLIES AND T R SWITCHING The mobile DC power supply Ground loops Electronic and relay T R switching circuits Voltage regulation circuits The base station AC DC power supply The solid state base supply Tube and hybrid power supplies DC to DC power supplies Multimode transceiver power supplies Includes use of SAMS Fotofacts schematics for step by step analysis of several common power circuits Troubleshooting the power supply Plus much more CHAPTER 8 ANTENNAS AND TRANSMISSION LINES Mobile antenna types and mounting hardware 27 MHz characteristics The wave antenna Reactance and tuning Impedance and radiation resistance The Standing Wave Ratio SWR Coax length vs SWR Coax characteristics Effect of in line accessories Coax losses vs SWR losses Some practical coax tips Bandwidth Gain and directivity Radiation patterns and field strength Omnidirectional antennas Loading coils Directional mobile antennas The Quad and Yagi beam including dimensions for home construction The PDL Antenna matching principles Tuning and troubleshooting the mobile whip Magnetic antennas Co phasing simplified Co pha
44. se matching tips Use of dummy loads in troubleshooting Matching high Z verticals Matching Quad and Yagi beams Stacking beams for increased gain Preventing TVI Matching special CB antenna types Plus much more APPENDIX A SOLVING NOISE AND INTERFERENCE PROBLEMS TVI and RFI Frontend overload Audio interference Ignition and other automotive noise problems Includes reference data and parts suppliers APPENDIX B FCC FREQUENCY CHART Quick reference 40 Channel frequency listings including tolerances INDEX Thousands of entries covering virtually every related subject Lets you troubleshoot a specific problem by looking up its symptom here This is the cheapest education in CB radio servicing you ll ever get And most likely the only modern book on the subject you ll ever find Completely illustrated throughout Hundreds of tips to make you money and impress customers with your technical knowledge SATISFACTION GUARANTEED Now available in many public libraries all over the U S Ask yours if it s in their Card Catalog yet Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com WANT LOTS MORE CB CHANNELS OR AN EASY HAM CONVERSION WANT TO BE THE LOCAL PLL EXPERT THAT OTHERS ASK FOR ADVICE OR SERVICE THE CB PLL DATA BOOK SHOWS YOU HOW NEW INTERNATIONAL EDITION HERE S THE MOST COMPREHENSIVE EAS
45. ther PLL circuit using a discrete crystal oscillator for loop mixing You would switch in new crystals to replace that signal Usually the mixing crystal is around 36 MHz or a tripled 12 MHz although a few odd circuits use other crystal frequencies For more specific synthesizer details you might want to order and study the CB TUNE UP and MODIFICATION REPORTS for your particular radio before proceeding These include details on suggested new mixing crystals Clarifier strapovers peaking etc About the SUPER EXPO The SUPER EXPO kit does everything the others do but is more complicated electrically The ability for T R splits makes it more useful for Ham type repeater operation than for CBs The extra circuitry adds to the building and installation time and you will need the right test equipment We don t recommend it for electronics beginners See our 2 page catalog ad on this kit for full details Published by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com The MASTER LIST of PLL CBs We ve computerized every known American and export model into a simple alphabetical list by brand name This lets you see at a glance exactly which chip the model uses whether it can be modified for other frequencies YES NO and which SAMS Fotofacts if any it s in Modification details for radios with a YES classification can then be
46. ts must add 7 sales tax esccdcaccdccaveda ei dedaiicteceoesusentencstendenenSeedesetacusevesesedoeesavntosasevnbacoendiauedevaleuestebiec 5 Add required shipping charges See Chart below cc cccccccccsssssseeeeeeessseseeeeeesesseaeeeeeeesessesaseeeeeesesseaeeeeeeeseeess HOW TO FIGURE SHIPPING CHARGES Add up the weight in oz of each item or special combo to get the total weight Then look under the class of Postal service you want to find the shipping cost PRODUCT WEIGHTS in ounces oz Kits CG filter small parts schematics CB Sources amp Master lists 6 0z Single copy of Screwdriver Expert s or CB PLL DATA book 11 oz Tuneup Mod Reports single Galaxy Uniden or Cybernet service book 80z Tech combo Galaxy Uniden Cybernet service books 15 oz Single copy of Understanding amp Repairing CB Radios book 28 oz Special combo Screwdriver Expert s PLL DATA Understanding CB book 44 oz Ist Class Priority Air Mail FOREIGN U S only 3 5 days after we ship i at FOREIGN TOTAL E of Mississippi CANADA MEXICO BY ZONE SEA MAIL WEIGHT W of Mississippi plus AK HI PR VI AIR MAIL AIR MAIL Z 1 Z 2 3 8 weeks Over 64 oz Add proportionately more Excess will be refunded Z 1 Bahamas Barbados Central America all Caribbean islands Europe U K Z 2 Africa Asia Australia New Zealand Philippines J apan all Pacific islands Middle East South America 6 Net total of Lines
47. uded due to the large number of possibilities IMPORTANT TECHNICAL NOTES READ BEFORE ORDERING 1 A Frequency counter 30 MHz oscilloscope and service manual or SAMS Fotofacts are required to properly align and install the SUPER EXPO An RF Signal Generator would also be useful for pre alignment before installation 2 The SUPER EXPO won t work with any of the following PLL circuits C5121 LC7132 LC7136 37 LC7185 MB8733 PLLO3A PLLO8A SM5124A TC9109 These are generally found in the cheaper AM only rigs not SSB types The SUPER EXPO will work with any PLL circuit using discrete TX and RX mixer stages including most of the formerly impossible chips like the LC7131 and TC9106 3 Radios with frequency displays Cobra 2000 2010GTL Courier Galaxy VI Uniden HR2510 HR2600 etc will not show the modified frequency The SUPER EXPO inverts the L O mixer injection from high side to low side or vice versa depending upon the radio The radio s built in display only works with the existing VCO frequency and since the SUPER EXPO doesn t affect the VCO the display won t be affected either 4 A few older rigs use separate 19 MHz and 34 MHz VCOs for AM LSB and USB You can only choose one VCO and therefore one mode such as USB for 10 Meter Novice use so check your synthesizer circuit first 5 The SUPER EXPO may not physically fit inside some of the smaller mobile CBs so check all dimensions carefully first The SUPER EXPO works with all the s
48. urgh PA 1am very satisfied with what I ve read CW Pittsburgh PA was worth the wait It is very interesting and feel very well written JS Cherryfield ME the most informative compilation of information have ever had the fortune to read AD New York NY the best instruction book that own I keep re reading it for all those helpful hints and always benefit GB Woodsville NH real good and well worth the money DM Gibson LA 80 far have repaired 4 radios that did not work for only 2 EBA Austin MN Your manual on CBs has helped me quite a bit JW Gibson GA bought your CB repair book which I found quite helpful on several occasions RB Cleveland OH 1S very helpful and real good MK Cumberland MD enjoyed reading your very comprehensive book JM Daytona Beach FL have thoroughly enjoyed it It has given me a lot of insight HWS North Royalton OH your book is fantastic have taken a CB radio course which helped me get my license but your book has helped me fix the radios RLB Hillsville VA Well that s my sales pitch so thanks for taking the time to read all this Remember you ve got a 100 money back guarantee no questions asked To order your copy return the enclosed Order Form or a letter along with your payment or credit card information But HURRY The FCC has already tried to ban parts
49. ven when you whisper e Harmonic and RC filtering assure clean problem free audio signal e Powerful IC design is equal to 15 transistors Adjustable clipping and output controls to match any situation or radio works with any CB or HAM transceiver Jumper options to match any stock mike power mike high or low impedance e Simple installation Small size 3 x 21 4 fits easily inside radio Connects to mike wires Powered by the radio s own 12 VDC supply Only 15 mA current drain Includes instructions for separate box mounting if desired e Simple kit construction Completely illustrated non technical instructions Use soldering iron and common hand tools Manufactured by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com SICK OF CHANNEL BLEEDOVER INTERFERENCE The Answer the CHANNEL GUARD A unique active IF filter that wipes out CB s most annoying 7 8 MHz amp problem once and for all 455 KHz 10 695 MHz Fits all PLL or crystal CB transceivers that use a 455 KHz 7 8 MHz or 10 695 MHz IF frequency Installs in minutes with common tools and no special knowledge Works on AM FM or SSB CB is popular Maybe even too popular Either the skip cycle is in with great DX to crowd every channel and all the Hams converting CBs to 10 Meters Or the skip is dead so every local guy in town seems to be busy talkin
50. wer AMs can even use our 10 695 MHz filter at the first IF to replace their broader 10 7 MHz ceramic filters If in doubt send us an Email message or a large stamped SASE with the exact model and we can advise you what to order Manufactured by CBC INTERNATIONAL e P O BOX 30655 e TUCSON AZ 85751 U S A TEL FAX 888 I FIX CBs 1 888 434 9227 520 298 7980 Internet www cbcintl com e Email info cbcintl com FREQUENCY MODIFICATION KITS EXPANDER 160 Crystal Oscillator amp Electronic Crystal Switch Expands frequency range of most PLL type CB radios Adds up to 120 extra channels Perfect for 10 Meter Ham conversions or the type of PLL modifications described in THE CB PLL DATA BOOK The EXPANDER 1601s a compact crystal oscillator which allows up to four crystal mixing frequencies to be injected into the PLL synthesizer circuit This gives a potential of 4 x 40 160 channels Since only one switch is needed there s no complicated multiple switching as in binary or BCD PLL expansions and no skips except for those already in the Channel Selector A unique wire jumpering arrangement allows the circuit to be used just as a remote crystal switch when the oscillator function isn t needed similar to the EXPANDER 240 described below The small PC board fits inside the radio and connects to the SHOWN ACTUAL SIZE PLL circuit DC power and your favo rite type of hard switch toggle slide rotary etc FEATURES PLANS PC BOARD MAY BE
51. which can use the EXPANDER 240 can also use the EXPANDER 160 but the reverse is not true That s because only the EXPANDER 160 includes the oscillator function which you d need for many PLL radios You d be paying more for an EXPANDER 160 in those applications where you really only need the EXPANDER 240s crystal switching You might also want to remove the EXPANDER 160 some day and re install it in another rig that does need the oscillator function giving you more flexibility On the other hand the EXPANDER 240 has 6 rather than 4 crystal positions and could be used in the older 23 channel radios with crystal synthesizers In those rigs the EXPANDER 240 would add a total of 5 x 4 related channel groups 20 extra channels The 6th slot must be reserved for an existing radio synthesizer crystal Not very cost effective for crystal CBs though there s the kit cost the cost of 5 crystals and the cost of paying a tech to build and install it if you can t do it PLL rigs are the most practical We call these kits 160 and 240 because any PLL CB using a mixing signal can theoretically have 40 channels per mixing crystal 4 x 40 160 and 6 x 40 240 respectively Few American CBs are broadbanded enough to tune this much range though with the limit typically 120 130 channels total For example the popular MB8719 MB8734 Uniden SSB models will tune a maximum of about 130 140 channels which means 3 full 40 channel bands plus a partial band on the
52. zines including CB MAGAZINE S9 SCIENCE amp ELECTRONICS and POPULAR COMMUNICATIONS You ll be amazed that finally somebody who really knows CBs can show you in plain language and pictures how to repair and tune your own radio and frustrate all those fast buck repair artists out there And who knows Maybe you ll even make some money yourself or start an exciting career in electronics For all this valuable information the price is only 22 plus shipping It would easily cost you that much just to get a power mike wired or to have an antenna repaired at any good CB shop And after saving yourself that next repair bill or receiving your first paid repair you ve already recovered the low purchase price All future repairs are pure gravy for you Since our first edition literally thousands of people have been helped by THE SCREWDRIVER EXPERT S GUIDE Here s just a small sampling of the many unsolicited comments we ve received from happy readers 1am more than pleased Everyone wants to know how learned it so fast DFN Canastota NY Let me commend you for one of the finest books on CB repair that have ever seen and I ve been a CBer for 16 years RBP Beloit WI A fantastic publication can understand it easily having no electronic knowledge CC Abilene TX mobile broken down for 3 months repaired it with your book s help for 1 00 so my book is now paid for GD Canada has helped me fix several radios It is so
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