Picture(s) of Kenwood - TH-79
Contents
1. 0000 x00 234567 8 The numbers are D302 D308 left to right with D306 missing 3 Remove diodes D304 and D307 4 Reassemble and apply power Mod complete PS Just cutting the green wire by the recharging jack is the MARS mod Don t cut if you intend to do the above mod Good Luck Cole AA7RD 19 07 1998 ly MARS CAP modification for the new Kenwood TH 79A Here is the MARS CAP modification for the new Kenwood TH 79A dual band HT Usual disclaimers about doing mods apply 1 Remove battery 2 Open case by first removing 3 screws 00 Phillips on back and 1 screw on side hidden underneath the rubber flap covering the DC power jack Gently pry apart starting at top file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 3 of 10 BNC connector will move with back knobs with front 3 Spread unit out Wires will hinge on the side with the PTT button 4 Looking on the back of the keypad front half locate green wire on upper left just below the CTCSS decoder module 5 Neatly cut this green wire and tuck back in so ends won t touch each other or other components 6 Reassemble Programmed memory will be lost since the CPU will notice the strap change and reset itself End result Before VHF RX 118 000 173 995 TX 144 000 147 995 UHF RX 438 000 449 995 TX 438 000 449 995 After VHF RX 118 000 173 995 TX 142 000 151 992. The TH 79A D s approach to programming is largely intuitive and that s an advantage when you re trying to become acquainted Jumping from memory channels to VFO and back is as simple as pressing a single button The same is true for hopping from 2 meters to 70 cm or vice versa When you re in the memory mode twisting a single knob will step you through the channels The same knob functions as a free wheeling frequency control when in the VFO mode If you forget how to use a specific feature the guide function is ready to assist Simply press the F key followed by the GUIDE button By rotating the ENC knob you re presented with a list of functions Each is described with text flowing from right to left across the display Thanks to Kenwood s unique dot matrix LCD the scrolling instructions are easy to read After you ve programmed the TH 79A D you can share the contents of the memory channels with other TH 79s through a wireless cloning feature In fact one TH 79A D can upload data to several others at once Several team members commented favorably on the multipurpose timer functions A battery saving mode shuts down many of the energy intensive functions if the radio is not used after 10 seconds The time out timer answers the prayers of many long winded hams If your favorite repeater drops out after say three minutes of continuous babble you can program the timer to cut you off well before then The TH 79A D simply drops back to
3. get to know the remote control feature on the mobile very well This makes the following explanation a little clearer To access this feature hold PTT and MR while POWER ON The display will indicate RC which I presume means Remote Control If you have correctly matched your DTSS codes frequencies etc the dual bander s keypad now becomes a function pad Pressing certain keys enables or disables functions on the mobile rig by sending the DTMF sequences for you Please note that all this fuction does is send the DTMF tones over the air to control your mobile rig I have not made a list of what each key does but as the 79 sends the DTMF tones the display will indicate the function i e RPT ON RPT OFF TONE ON TONE OFF etc 73 de Clayton KD4IDN And this from Chuck Scott NSDNX The RC function is configured to directly control radios such as the TM 732 In fact if you look at the layout of the microphone remote commands for the 732 it very closely matches the key assignments for of the RC mode Since Ihave a TM 732 installed in my car Ihad a chance to try this out and it s VERY convenient Everything from direct frequency entry with the F key to enabling X Band repeat I m really surprised they aren t marketing this feature of the radio 19 07 1998 ly Post Modification Spec Sheet Author Clayton Wagar KD4IDN Here is a small chart showing the measured specifictions of TH79 S N 60300272 after modificati
4. heard of people frying their HT s in repeat mode p3 01 1999 Ly TH 79 Save function amp packet file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 10 of 10 From OH2ZAZ OH2RBI FIN EU From some testing I ve done it looks like it s necessary to set the SAVE mode on the TH 79 s menu to OFF for proper packet radio operation When this function is ON my PR system misses the first FBB UNPROTO updates after an update request originating from my station unless another packet arriving in between the request and the first UNPROTO packet wakes up the TH 79 If not woken up the RX seems to miss some of the first update packet and Winpack shows only the second and following which generates repeated requests for an update of the message list The updates go to the FBB Unproto buffer but the BBS system keeps repeating them all over and over again including one final time when the first FBB UNPROTO update does happen to get registered and the buffer clears When I first got the TH 79 I measured current consumption and saw it going down during standby without a signal then when a signal was received the current would go up and stay high for a rather short while after the signal had disappeared and then it would go to sleep again This behaviour is present when the SAVE mode is enabled I assume the squelch is too slow for packet when the SAVE mode is en
5. the receive mode Finally the TH 79A D offers a timer that shuts down the radio completely if it hasn t been used for one hour All of these timers are programmable or they can be disabled altogether One interesting feature of the TH 79A D is not mentioned in the manual although it is mentioned in the advertising AM aircraft receive capability As it turns out the TH 79A D has a hot aircraft receiver Team members enjoyed listening to airliners in contact with Boston Center or on approach to Bradley International Airport near Hartford Connecticut The TH 79A D was judged awkward in only one respect the operation of the squelch There is no squelch control on the TH 79A D in the traditional sense a knob Instead you must select among several squelch levels by bringing up the appropriate program menu Most team members didn t find it too objection able but it might drive you up the wall if you re the type who often fiddles with the squelch Reprinted with permission from JULY 1995 QST ARRL 19 07 1998 Remote Base Operation with Kenwood 732 733 file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 8 of 10 Kenwood has now simplified remote base operation of their mobile rigs with the TH79 I will not give a step by step on how to control the mobile rigs since they are different Hoewever to really understand this feature I would first
6. 5 UHF RX 420 000 449 995 TX 420 000 449 995 Automatic repeater offset and shift selections remain normal If Iread the schematic right the green wire corresponds to W301 which also serves the same purpose as removing D308 More research needs to be done on other mods I m especially interested in extending UHF receive beyond 450 There is a row of diodes right below the uC which appear to be D302 through D308 the configuration straps HOWEVER I need to caution anybody thinking about playing with the diode straps that it will not be a casual operation For one thing the diodes are SMD 603 style extra extra tiny and the plastic board hold downs molded into the front case are right on the landings for most of the diodes This means that the board will have to be removed from the case a very involved procedure and working with the tiny diodes will require magnification tools as well as the correct micro tip iron It is not a job for the inexperienced or all thumbs Also as noted previously the non US versions of the TH 79 have an 800 MHz receive section All RF components of this section are not present in the US version Frankly it would easier to import a gray market version of the radio than it would be to attempt restoring this coverage in the US with parts mike musick NOQBF 19 07 1998 li Hidden options TH 79 Playing around with my Kenwood TH 79 handheld I discovered some hidden possibilities that are not m
7. EZQ 19 07 1998 li Umbau TH79e auf 9k6 From DG3MMU DBOKCP BAY DEU EU Andreas file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 6 of 10 Hier kommt ne Anleitung zum Umbau des TH 79e auf 9k6 1 Oeffnen des Ger tes Alle Stecker incl Antennenkabel abziehen den Akku entfernen Auf der Rueckseite des Geraetes die 3 Schrauben loesen ebenso wie die kleine Schraube an der Seite beim Antennenanschluss Vorsichtig das Gehaeuse oeffnen Nun die Haelfte mit der LCD Anzeige nach links legen und die andere nach rechts wer haette das gedacht Falls ein CTCSS Modul drinne ist kommt das auch raus 2 RX Modifikation Die vier Schrauben in der ich nenn sie mal Power Haelfte mit den beiden HF Hybrids und dem vielen Kupferblech rausschrauben und vorsichtig rausnehmen Dazu muss noch die BNC Buchse weggeloetet werden Auf der Unterseite gibts nen IC Marke Motorola MC3372D Demodulator der ist fuer UHF Das RX Kabel wird da am Pin 9 angeloetet Damit ist der RX Ausgang vom UHF Empf nger IC schon mal fertig 3 TX Modifikation Im zweiten Gehaeusedeckel mit den Potis und den MIC Lautsprecher Buchsen gibt es eine Tochterplatine die den Mikrophon Amp beherbergt Einfach die Platine runtermachen ein Draht an den Widerstand neben dem IC 308 TA75W558F und das ist die TX Einspeisung Ich hoffe in der kleinen Zeichnung kann man wa
8. H 79 Page 5 of 10 0 0 0 0 0 0 0 0 2 2 3 4 5 6 7 8 2 X component present no diode here R Resistor D Diode R 402 and R 502 are only displayed for reference Hint in the SCHEMATIC DIAGRAM you received with your radio there is also a diode program diagram wich lists the E3 version and other versions also For example the K version is the American version Please note that in this table D 302 and D 305 are not drawn and have to be present Background information I chose for the E3 type because i had a modification note of the TM 733 In this note i read what the different type s letters had for operating RX TX frequency s So if you want to find out what the other types would do see if you can put your hand on this TM 733 modification note WARNING The radio you purchased is very expensive don t give me the blame if something does not work If you diside to make this modification is on your risk only THIS IS A SPECIALIST JOB BE WARE OF THE TINY COMPONENTS For stations who live nearby i can give assistence REMARKS Only the normal TH79E HARDWARE is capable of receiving 900 MHz This is not possible for the other versions FINALY I hope you will enjoy these hidden options In case I do discover more of them I will share them with you On the other hand if you have further information on hidden options and or modifications I would be please to know them as well Best 73 from Ron PEIOZH PI8
9. Modifications for the Kenwood TH 79 Page 1 of 10 Modifications for the Kenwood TH 79 Picture s of Kenwood TH 79 19 07 1998 TH 79 clone memory contense of two radio English language 19 07 1998 TH 79A extended RX and TX range for new radio English language 19 07 1998 TH 79A Wide Band Modification English language 19 07 1998 MARS CAP modification for the new Kenwood TH 79A English language 19 07 1998 Hidden options TH 79 English language 19 07 1998 TH 79 WIDEBAND RX ONLY English language 19 07 1998 Umbau TH79e auf 9k6 German language 19 07 1998 Kenwood TH 79A D Review English language 19 07 1998 Remote Base Operation with Kenwood 732 733 English language 19 07 1998 Post Modification Spec Sheet English language 19 07 1998 Cross Band Repeat English language 03 01 1999 TH 79 Save function amp packet English language 19 07 1998 li TH 79 clone memory contense of two radio Dear friends Hope a lot of you enjoy to play with the TH 79 I want to explain how to clone the memory contense of two radios on the air The clone procedure is same with all others use of DTMF tones do not disturb transmission etc You must take care that both radios are really same both have extended range or not both are E version or not etc It will cause some problems if you try to clone i e an E version without expansion into a A or J version If you have both radios please hold down the 0 key PAG L Key w
10. abled I need to have the squelch at position 4 btw because of digital noise on 144 675 MHz Does anybody else have the same experience with the TH 79 SAVE mode and the FBB UNPROTO updates tu es 73 de Arjen OH2ZAZ OH2RBI Current QTH Helsinki KP20LD Have you any tips trick or modifications you can t find here please E mail them to me or use the mail form Can t you find a mods please don t e mail to me All mods 1 have is listed on this site Back to start page file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010
11. cies the handheld should have been modified in my case I provisionally did cut the green wire I hope you will enjoy these hidden options In case I do discover more of them I will share them with you On the other hand if you have further information on hidden options and or modification I would be please to know them as well Best 73 from Hans PA3ESZ PI8SVNW 19 07 1998 TH 79 WIDEBAND RX ONLY Yeahh this is the modification you all have been wating for Recently I purchased a TH 79A in the United States having the idea that is was possible to convert it to a model TH79E After some research i discovered that it was possible to make a TH79E Inspired by this succes i wanted to have the extra RX possibilities and after the so called green wire cut i had the wanted RX but also TX Because of government regulations this extra TX it is not allowed in Holland So i searched a little farther and fixed the job The following modification is called the E3 modification This modification gives you TX 430 440 MHz and TX 144 146 and RX for all built in frequencies that the hardware of your radio is capable to receive What to do Find some one that can manage very tiny SMD components Cut the green wire and change your diodes under the CPU so that it looks like this X X X X X X X file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood T
12. entioned in the user manual A Clone Action to be taken by both stations Switch power off Press both the PTT and the VFO key and keep them pressed while switching the power on Switch power off again Press the PAG L key figure zero and keep pressed while switching on the power again Now in the display the indication CLONE will appear ann As soon as the station that will transmit presses the PTT switch for a while cloning will start This will take several minutes After cloning is finished the transmitting station s display will return to normal whereas the file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 4 of 10 display of the receiving station will indicate END B Switching to other VFO s other bands As you may know in the menu 4 VFO s are possible namely menu nrs 13 14 20 and 21 Menu 13 and 14 being the standard VFO s for vhf and uhf and menu 20 and 21 for the bands 300 399 Mc and 800 999 MHz It appeared to me that the vhf band menu 13 can be switched to 300 399 Mc menu 20 whereas the uhf band menu 14 can be switched to 800 999 Mc menu 21 Just make the band you like to change the active band PTT indication in the display near to the frequency and then first press the function key followed by pressing the LOW hi lo el key Needless to say that in order to be able to receive those alternative frequen
13. hen you switxh on the radio So you see the letters CLONE on the display Please push the ptt on the radio which has to be the master It takes a time to transmit all memory with maybe names call sign etc After Clone is finished you see END written in Display Best is to switch of both radios After switching on again you will have two same radios Enjoy it and best wishes 73 from hanno 19 07 1998 b TH 79A extended RX and TX range for new radio Remove diodes D304 and D307 Thats all Don t cut the green wire or install any jumpers as before Just take out these diodes A WHOLE lot easier than moving and jumpering With this mod the capability is same as the other mod ie 67 174 995 and 400 511 995 RX 136 174 995 and 400 511 995 TX Mine wouldn t recieve all the way down to 67 MHz but it did go to 85 MHz It changes to AM receive below 136 MHZ automatically My TX power was gone above 505 MHz but was solid elsewhere in VHF and UHF file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 2 of 10 Enjoy but don t create problems with the new capability Wouldn t it be nice if Kenwood would make a RX only mod with these capabilities and we wouldn t have to worry about accidental transmissions where we shouldn t be transmitting I for one don t want or need to TX just RX 73 Cole AA7RDAugust 11 1994 19 07 1998 TH 79A Wide Band Modif
14. ication Following is a modification for the Kenwood TH 79A Dual Band HT which opens it up to tuning from 67 174 MHz and 400 511 MHz Actual receive was 85 135 995 AM and 136 179 995 FM with reasonable 0 5 microvolt or better sensitivity at all the points I measured Transmit was 136 179 995 and 400 511 with power dropping off at the ends but still usable about 0 5w on the high scale at the band edges This mod is the official one from Kenwood taken from a data sheet put out by them It supercedes an earlier one I posted involving moving some diodes As usual I take no responsibility for the mods or your use of the unit after mod Please exercise good judgement and don t endanger our ham bands with your irresponsible actions WARNING CAUTION LOOKOUT ETC The diodes to be moved are microscopic About 1mm long by 0 5mm wide This mod should be done by professionals on a closed track only Children do not attempt this at home Requires extremely small soldering tools and MUCH skill 1 Open the unit by removing three screws from the back and one under the DC power input cover Carefully separate the front and back pieces The two case halves may be disconnected by pulling the wired plug and by prying the brown latch on the ribbon cable connector up enough to release it 2 On the front PC board in the lower right corner as viewed from the rear with the knobs pointing up there are seven spots for diodes in a row with one diode missing
15. on The measurements were made with an IFR 1200S Service Monitor on the bench with a 6V power supply Your milage may vary these are just what happened with mine and I would suspect that most units are pretty similar 73 de Clayton KD4IDN Band VHE Frequency Sens uV Power Mode 108 4 A3 10 2 15 75 x 20 40 i 25 30 30 30 35 30 5 40 12 2 9 F3 45 T2 229 file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 9 of 10 150 13 2 8 m 55 15 2 4 i L60 18 149 x 65 20 1 45 70 sal 1 10 75 30 0 85 a 79 995 35 0 70 Band VHF 2 set to 300Mhz Frequency Sens uV Power Mode 300 50 75 A3 F3 320 4 20 u 340 3 6 u 360 2275 380 2 6 o 400 2h eto Y Band UHF Frequency Sens uV Power Mode 400 11 1 0 F3 410 4 1 9 420 1 1 85 s 430 2 2 2 435 12 2 3 7 440 10 2 9 445 10 29 450 10 2 5 455 15 2 3 460 16 2 3 2 465 20 2 0 470 45 1 58 480 1 1 6 s 490 2 13 3 500 6 1 1 a 510 no RX over 509 0 8 P 19 07 1998 b Cross Band Repeat from Chuck Scott NSDNX The TH 79 does go into X Band repeat Press the F key then the MONTI key to enter repeat mode Use the same to return to normal There is a 10 min transmit limit so it s not useable for long duration monitoring of a continuous transmission That s understandable in light of the number of horror stories I ve
16. s erkennen Der Draht wird am oberen Kontakt vom R angeloetet wo das R steht der betreffende Widerstand ist ein groesserer Widerstand als es die andren sind R 4 TARRAT 08 l KkK RH 1 RH TE Steckkontakt zur grossen Platine Wenn fertig wieder die Platine auf den Kontakt stecken 4 Letzte Schritte So die typischen 2 Draehte sind angeloetet ist auch keine Bruecke unerwuenscht entstanden OK dann das ganze Geraet in umgekehrter Reihenfolge wie beim Zerlegen unter Punkt 1 wieder zusammenbauen kurzer Funktionstest und dann kann das ganze schon an das FSK Modem angeschlossen werden Gedanken muss man sich nur noch ber die Verbindung zur Aussenwelt machen entweder einen kleinen Platinensteckverbinder 3 polig und einen Pol davon abfeilen oder eine 2 5mm Monobuchse passt wahrscheinlich ebenso nur abgefeilt rein ins Geraet reinbauen file C Documents and Settings rodolfo Desktop Articoli IW2BSF Rtx kenowood 03 09 2010 Modifications for the Kenwood TH 79 Page 7 of 10 Ich uebernehme keine Verantwortung fiir die Richtigkeit der in der Anleitung gemachten Angaben und fiir Schaeden die im und am Geraet durch die Modifikation entstehen Die Anleitung ist etwas groesser geworden dafiir aber hoffe ich einfacher und auch fiir Nicht Profis etwas Loeterfahrung braucht man schon verst ndlich Ok 73 de Andy DG3MMU DBOKCP BAY DEU EU 19 07 1998 li Kenwood TH 79A D Review
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