Telex ENG-4 User's Manual
Contents
1. L 4 L BATTERY RELEASE BATTERY HOLDER POPS UP Figure 3 Rear Panel ENG 4 MIC Level Control Rotary screwdriver adjustable control which controls MIC Level Output to the front panel XLR receptical when selected by LINE MIC Switch 200 ohm balanced MIC Level Output LINE MIC Switch A slide switch that selects LINE or MIC level output for front panel XLR receptical Use supplied plastic screwdriver to operate slide switch to desired position Compandor IN OUT Switch A recessed slide switch that controls compandor operation Must be set to match transmitter operation Use supplied plastic screwdriver to slide switch to desired position Channel Selector Choice of 4 separate RF channels operating frequency Must be set to match transmitter channel or frequency Screwdriver adjustable Battery Release Squeeze to release slide locks Internal battery holder pops up through top of case WT 400 CONTROLS AND CONNECTIONS LOW BATTERY ada el LED TRAILING WIRE ANTENNA MICROPHONE JACK OFF ON SWITCH N D Telex WLM 200 or Equivalent ADAPTOR CABLE Connect to any Impedance Microphone 100 10k ohm NOT SUPPLIED MICROPHONE amp CHANNEL SELECTOR GAIN CONTROL Frequency Switch Figure 4 Top Panel WT 400 BATTERY COMPARTMENT RELEASE BATTERY 4 COMPANDOR IN OUT SWITCH in amp w ouT Figure 5 Internal View WT 42. Make sure Telex transmitter is turned on this will usually eliminate the interfering signal If problems persist with Telex transmitter on you will probably need to have your system s frequency changed to another channel Transmitter battery is possibly in need of replacement Receiver antenna possibly located incorrectly See Pages 16 and 17 for proper placement If using throw away batteries make sure they are alkaline Mallory MN1604 or equivalent If using nickel cadmium make sure it is an 8 4 volt 7 2 volt batteries won t work Refer to Page 15 If using throw away batteries make sure they are AA alkaline Mallory MN1500 or equivalent 1 4 BATTERY INFORMATION General Improper battery selection use in stallation and care are the cause of numerous wireless system failures Alkaline Batteries Alkaline batteries such as Mallory ss DURACELL or Eveready s ENERGIZER provide the most reliable operation in wireless transmitters The use of low cost carbon zinc batteries is NOT recommended Nickel Cadmium Batteries These batteries can save you money in the long run as they can be recharged but they can also cause disappointing wireless performance If you want to use rechargeable nickel cadmium batteries you must select a heavy duty nickel cadmium Conventional 9 volt sizesuch as GH or Radio Shack are only capable of providing 7 2 volts which
3. hiss which is undesirable LOW OUTPUT System produces a lower output level than wired microphone in sound system Reduce audio gain on the transmitter by ad justing gain control as suggested on Pages 11 and 12 Check the gain settings on both the transmit ter and receiver as indicated on Pages 11 and 12 they may be too low Check Compandor IN OUT Switch Check the gain settings on both the transmit ter and receiver as indicated on Pages 11 and 12 they may be too low TROUBLESHOOTING CONT PROBLEM SOLUTION FEEDBACK Moving around performing area produces squeal or howl in various locations DROPOUTS When moving around per forming area there seem to be locations where the signal swooshes or completely disappears INTERFERENCE System picks up signals other than wireless transmitter REDUCED DISTANCE System doesn t operate as far as it once did System doesn t operate as well as you think it should BATTERIES DON T LAST TRANSMITTER BATTERIES DON T LAST RECEIVER If you are unable to solve the problem contact the dealer from whom you purchased the system for assistance Reduce gain settings on wirel ss system and sound system Readjust nearby loud speakers Make sure the antenna is connected and fol low the location suggestions on Pages 16 and 17 Change the location of the receiver antenna or avoid the bad area with the transmitter
4. Telex Operating Instructions Professional Wireless Microphone System ENG 4 WT 400 TELEX INTRODUCTION WHAT IS A WIRELESS MICROPHONE SYSTEM Microphone This is an electro acoustic transducer which responds to sound waves and deliver essentially equivalent electrical waves These electrical waves are sent to the belt transmitter or handheld unit Transmitter The transmitter generates and amplifies an RF Radio Frequency carrier signal modulates this carrier with the microphone signal and radiates the modu lated RF carrier SIGNAL MICROPHONE TRANSMITTER Figu RF CARRIER Receiver The FM VHF receiver is tuned to the frequency of the transmitter The receiver picks up the radiated RF signal from the transmitter through the antenna and converts the RF signal into audio vol tages for use with PA Line Network etc The receiver frequency must be matched to the transmitter frequency CUSTOMER SUPPLIED ae eae eS AUDIO MIXER SPEAKER LAMPLIFIER i FM RECEIVER are rel Block Diagram of Typical Wireless Microphone System WHAT FREQUENCY BAND DOES THE TELEX SYSTEM OPERATE IN The Telex ENG 4 System features dual channel crystal controlled transmitters and four channel receivers operating in the VHF Band between 150 216 MHz There are 10 standard frequencies available Your system operates on a fixed frequency which can be compu
5. OE E e Ea aaa ee Adjustable 7 dB Maximum 200 ohms 12 kHz deviation 21 dB Minimum 200 ohm 12 kHz deviation Battery u ov csin s soss pa ose eete Four AA alkaline or nickel cadmium required for interne use WT 400 TECHNICAL INFORMATION General Description A belt worn battery Features Small size lightweight and is self powered VHF FM Transmitter ideally contained suited for any activity requiring a cordless portable microphone Controls and Connections Front Panel Power OFF ON Switch Low profile slide switch allows access to power OFF ON Microphone Gain Control s ssess Screwdriver adjust for microphone gain control Frequency SWE ason annaa Slide switch choose either channel A or B Frequency Microphone Connect vs iia eine nea eases eE EEEa mere 4 pin LEMO connector PGND iren 59 56 5 WERT ES ROCEPRNEB EES OERE Permanent strain relief flexible wire type Controls and Connections Internal Compandor INJOUT Swieb ii lt asxdnastsessniaevndemwgueay aaa ven Ea Slide switch AHEDBR os ie shin 9005 Wa sisia s Flexible wire type permanently attached to the front panel top Battery Compartment lt 000cccseces For 9 volt alkaline Mallory MN1606 or equivalent Average life is 6 8 hours minimum Battery Tests sess sisi A red LED is mounted on the front panel A fresh battery will cause the LED to flash one time when the transmitter is turned on A week battery will illuminate the LED constantl
6. WT 400 When ordering antenna order b holder the frequency of the receiver Order No 64480 000 ENG 4 Replacements Earphone Assembly For ENG 4 for 150 158 MHz Order No 57032 005 monitoring incoming audio from 158 165 MHz Order No 57032 006 transmitter s microphone Four separate 165 175 MHz Order No 57032 000 parts 175 185 MHz Order No 57032 001 Cord CMT 98 185 195 MHz Order No 57032 002 Order No 60013 015 195 205 MHz Order No 57032 003 B Eartip ET 1 205 216 MHz Order No 57032 004 Order No 35608 000 C Earloop AEF 2 WT 400 Replacement Order No 09252 000 150 216 MHz Order No 70277 000 D Earphone RTW 04 Order No 60012 005 p CF For the ENG 4 20
7. is going to be moving among various locations you will inevitably run into occasional frequency conflicts In either case when you re not using the wireless microphone turn the gain down on your audio mixer just as you would a wired microphone If a mixer control is not avail able turn the receiver off when the trans mitter is not in use This will prevent the reception of undesired signals If a mixer control is not available and the system must be left on the transmitter should be left on to prevent the receiver from picking up outside interference ENG 4 TECHNICAL INFORMATION General Description A fully transportable Features Small size light weight and is self VHF FM receiver ideally suited for electronic contained news gathering film or sound recording or other such activities Controls and Connections Front Panel Rotary Function Switch Meter ecceeeeeeenes 4 position rotary switch with meter Position OPE ore cone came recto ce mero ese Non functional no current drain SHEE EE Ll EE T eked eiaponce nie paceuatoate toveseansieeee Built in meter monitors audio output PG SETTER pean ore r n E vant Savon atore E A A tency ons Built in meter monitors RF received Position BAT Pisses estas ve paws suienes nacre Built in meter monitors battery voltage SVE MOTILO zeant ENEN ANEO E AIEEE Adjusts volume to headphone output jack Antenna dack ausecsai asas BNC jack supplied with flexible anten
8. 00 Microphone Jack The WT 400 was designed to Trailing Wire Antenna A fully flexible 14 wave easily interface with dynamic or electret antenna with a permanent strain relief microphones in the 100 10k ohm impedance range A 10k ohm resistor is permanently wired to the audio Microphone Gain Control Screwdriver circuit to provide a source for electret microphones adjustable Adjusts the Audio Gain of the No XLR adaptor cable is provided with this system microphone either up or down baea hned ie galee the Pae WOMI Channel Selector Frequency Switch A slide switch which allows the user to select either Channel OFF ON Switch A low profile slide switch is A or B frequency Screwdriver adjustable ided to all OFF a ACCHA SOPOTE AAN Battery Compartment Release Depressing the Low Battery Indicator LED Fart of the battery two side spring latches and pulling the bottom of the check circuit When the power switch is placed in the case downward exposes the battery compartment ON position the LED will flash one time if the r battery is good A poor battery will cause the LED to Compandor IN OUT Switch Internal switch be illuminated continuously and a bad or unusable allows the user to control the WT 400 compandor battery will not cause any illumination at all operation Must be set to match receiver operation oe FOR LINE LEVEL CONNECTION Less Common This connection is identical to MIC LEVEL connection with the foll
9. 08 METER FRONT PANEL OF ENG 4 TOO HIGH TOO LOW CCW TURNS CW TURNS AUDIO GAIN AUDIO GAIN DOWN UP Figure 15 High Level and Low Level Gain Adjustment 12 Receiver Gain Setting After the trans mitter gain has been properly set you are nov ready to set receiver gain NOTE Insure that the Compandor IN OU switch on the receiver agrees with the trans mitter Compandor IN OUT Switch Set the LINE MIC Switch as required In th LINE position thereis no adjustment The Lin output level is fixed In the MIC position th output level is adjustable via the MIC Leve Control screwdriver slot Refer to Figure 3 Adjust the level to accomodate the mixer o other audio system NOTE This control does not affect the ENG 4 meter indication If monitoring is required plug the earphone supplied into the Monitor Jack on the front o the ENG 4 receiver and adjust the Monito Level Control for comfortable listening Adjusting the Monitor Level DOES NOT affec the MIC LEVEL They are independent functions Refer to Figure 2 SYSTEM WALK THRU General Now that you have successfully set up your Telex Wireless System and turned on your sound equipment amplifier mixer video cam etc you are ready to test the overall performance by Walking the Telex transmitter through the areas in which you will be using it The system walk thru can detect the following RF problems Weak signa
10. 50 uS de emphasis EE ETOC UONE ace ers KOEIE RD EAEEREN E EREA O ENERE EAS 10 7 MHz ER Sec Vit serora r Ere E ANEN NENNEN 9 pole filter 150 kHz wide 6 dB 370 kHz wide 60 dB aake rin WEE E r A r N E A A N 1 0 uV or less 0 5 aV typical for 12 db SINAD MMB ge REjSChOny anea oumas S Eo ENEN AANE ASEE ARESE ERENER IN IA AOT RON ENANS 90 dB Spur OuS KOJEC OE e E SETE AS ESETE A GREE RTSO E AERA EEEE EEE EEA 70 dB SiON SL to NOBe RANO sones y oA NIEREN ASEE EATE EA ars E lala aE EEEE ES ultimate Commn a ndore ao Mey KE ATAA IE ETE EA ERNE EAE NE ar 104 dB Uncompandored ceases an aH Ses OTS a GSO CUED BO AE TE 68 dB Seqwuelch Threshold ec ois ovine snn nA NMA EONA RINE Nea aNS see eess Internal set at 1 0 nV Suet ct tol oN 279 Uc SE tT A Mee ep T PRR SE Sc Rh Ue cE eo era els aed sa ce tt A Sa ee S 100 dB ERATE oA R A oT aes de edna S ip aes RMP A EIN fbn cit EEO Rc ultimate Ref 12 kHz deviation 104 dB PA ERR ET IPO UN pycee eg eaan oa Ges oe ae a ae Ref 12 kHz deviation 164 dB ARN OTO PPI SUOLTION crcrsyae garcia asus panniers OERA A OA 1 or Less 0 5 typical at full output 1 kHz Audio Fregneney RESPONSO cris araea Ean EEA ane 1 dB 100 15000Hz Headphone Onteat Jack Power 6 cscs cs caesie s nies ipese rosaman da EAEN E EE aea 1 kHz 350 mW 8 ohm load 200 mW 16 ohm load 100 mW 32 ohm load Line Eevee l OUE oicso 2 3eccainressssjarem sarna eies 14 dBm Maximum 12 kHz deviation Mic Level Quitas eso eeni EE EEE
11. d now be STEP 1 ready a set optimum signal gain settings on Turn the ENG 4 receiver Function Switch to the each unit ryan an RF position Set the WT 400 power switch to the ON position The ENG 4 meter should indicate in the GREEN area Turn the ENG 4 Function Switch to the AF position See Figure 14 27049 A 009 pe ENG 4 FUNCTION SWITCH TO RF POSITION 3 ENG 4 METER NEEDLE IN GREEN BAND 4 FUNCTION SWITCH TO AF POSITION URI LPT CONTINUE TO NEXT STEP Figure 14 Checking Incoming RF Signal Abts STEP 2 The microphone GAIN Control on your WT 400 has been factory set for normal or average audio levels High Level Setting If your application is in a high SPL Sound Pressure Level area such as singing or instrumentation the factory gain setting is probably too high and will result in overload or distortion This will be indicated on the ENG 4 receiver meter between 0 to 3 red Low Level Setting If your application is in alow SPL area the factory gain setting is probably to low This will beindicated by low meter indication on the ENG 4 meter 20 or below white To correct either a too high or too low setting adjust the Microphone Gain Control screw driver slot on the front panel of the WT 400 so that average audio causes the meter to indicate between 20 to 5 An occasional overshoot into the RED area is allowable Refer to Figure 15 27049 A 0
12. gure 7 Rotary Function Switch Meter Display ROTARY FUNCTION SWITCH 4 position switch OFF Position Non Functional no current drain AF Position Indicates relative modulation of the system Audio Output RF Position Indicates when the ENG 4 is receiving a transmitter signal Carrier Indicator Indication is relative only Red bar normally indicates weaker RF Signal Green bar normally indicates stronger RF Signal BATT Position The meter indicates the relative battery condition Red bar indicates weak or marginal batteries Green bar indicates good batteries 5 METER DISPLAY A tri color meter relative indication of Audio Output AF received signal RF or battery condition Selectable via the Rotary Function Switch Earphone Jack Connect to supplied earphone for monitoring incoming audio from transmitter s microphone Level Monitor Control Adjusts volume to earphone output jack DOES NOT AFFECT MIC OR LINE LEVEL XLR Receptical Output to audio sound system Amplifier Mixer Video Cam etc Output is adjust able for MIC Output by means of the MIC Level Control MIC LINE Switch must be in the MIC position to be adjustable Refer to Receiver Output Connection pages 9 and 10 MIC LEVEL CONTROL E EEN MIC fever Faa COMPANDOR LINE Ty ic IN I Out D LINE MIC SWITCH COMPANDOR IN OUT SWITCH CHANNEL SELECTOR 27049 A 004
13. he Telex Model WT 400 Transmitter is Type Accepted under United States Federal Com munications Commission Parts 90 and 74 The receiver ENG 4 is Type Accepted under Part 15 of the Federal Communications Commission Licensing of Telex equipment is the user s responsibility and licensability depends upon the user s classification user s application and frequency selected Telex strongly urges the user to contact the appropriate telecommunica tions authority for any desired clarification CAUTION Changes or modifications made by the user could void the user s authority to operate the equipment eral ee aces lt bi ACCESSORIES Lapel Microphone Electret type comes with Nickel Cadmium Battery For WT 400 tie clip and lapel clip holder Transmitter 8 4 Volts WLM 100 Order No 63852 000 Order No 63912 000 WLM 200 Order No 63852 001 PH 22 Headworn Microphone Close talk ing noise cancelling electret Order No 64327 002 Carrying Case For the WT 400 Trans mitter Order No 59756 000 Adaptor Cable SLR to LEMO adaptor cable for WT 400 Order No 63841 000 Carrying Case For the ENG 4 Receiver Order No 70372 000 27049 A 936 ee ry ts BC 2 Battery Charger For charging nickel cadmium battery used in WT 400 Order No 64267 000 aroas aore REPLACEMENT PARTS Battery Sled Assembly For ENG 4 Antenna Replacements For ENG 4 anc Receiver Replacement or for extra battery
14. is not sufficient to power the Telex WT 400 transmitter Nickel Cadmium Memory Effect For maximum performance and longer life from nickel cadmium batteries you should completely discharge them whenever possible This can be done by simply leaving the Telex transmitter turned on overnight If nickel cadmiums are not discharged on aregular basis they will remember how long you use them for each performance and will not have the ability to retain their original performance ENERGIZER is a registered trademark of Union Carbide Corporation DURACELL is a registered trademark of Duracell Inc 15 Tapoca Tie Conventional RAY O VAC Not Carbon Zinc Recommended Does Not Work 1 to 2 Hours per charge Alkaline MALLORY MN1604 or Equivalent GE or Radio Shack Nickel Cadmium Rechargeable Varta or Gould Again and Again Nickel Cadmium Rechargeable Table 1 Battery Information for WT 400 Oe RE 6 8 Hours Alkaline EVEREADY E91 or Equivalent EVEREADY Nickel Cadmium CH15 or Equivalent 45 Hours Table 2 Battery Information for ENG 4 GE is a registered trademark of General Electric Company Radio Shack is a registered trademark of the Tandy Corp SROH HHIHHIHHII RES nr ES SPREE PD SE tS ANTENNA INFORMATION Antenna Alignment To align the antenna properly refer to Figure 16 27049 8 O16 Figure 16 Antenna Alignment Do and Do
15. l strength caused by 1 Poor antenna location 2 RF Trouble Spots 3 Operating distance beyond System capability 4 Malfunctioning system Carrier Indication Under normal condi tions with the Rotary Function Switch in the RF position the carrier indication on the meter should always be center scale or higher green area with the transmitter ON See Figure 14 Weak Signal conditions will result in low meter indication with the potential of actually hearing this in the sound system Audio Feedback The system walk thru can also uncover locations in the performing area which are prone to audio feedback usually sounds like a squeal or a howl Feedback can be a problem for any microphone whether wired or wireless To eliminate feedback observe placement of the microphone and any nearby loudspeakers i In 99 of allinstances you will set up your Telex Wireless System walk it through and achieve error free performance If in the rare instances your Telex System does not pass during your walk thru evaluation refer to the last two sections of this manual which deal with Antenna Information and System Trouble shooting TROUBLESHOOTING Reread the sections of this manual to make sure you have completed system set up properly PROBLEM SOLUTION DISTORTION System s audio quality seems distorted at medium to high input levels HISS System seems to produce a
16. n t Antenna Polarization The Telex Wireless System is Vertically Polarized This means both the transmitting and receiving antennas should operate in the vertical position 27049 A O17 RECEIVER ANTENNA TRANSMITTER me Figure 17 Vertically Polarized Antenna Antenna Placement Keep the distance between the transmitter and the receiver s antenna as short as possible The greater the distance the weaker the signal 27049 B 024 Figure 18 Distance Between Transmitter and Receiver Make sure the signal path between the transmitter and receiver s antenna is unobstructed You should always be able to visibly locate the antenna at all times 2704 4 0r8 Figure 19 Keeping Site Clear to Antenna E Attempting to operate the wireless system 27049 8 021 through or around walls ceilings metal objects etc will reduce system range and performance 27049 B 020 WALLS CEILING METALLIC OBJECTS ETC CAN SIGNAL REFLECTION OFF A METAL OBSTRUCTION De r PRA gt CAUSES REDUCED SIGNAL AND MULTIPATH ene a Figure 20 Fi s gure 21 Operating Through Obstructions Multipath Reception Dropouts Picket Fencing A signal dropout can occur at any operating distance and is caused by the direct signal from the transmitter and reflected signals from the transmitter called multipath arriving at the receiving antenna out of phase FCC REGULATION T
17. na for frequencies installed PQS VDO JACE rea TEE ET EE EEE T NEEE EAN E ONTAS For external power input Accepts 9 to 28 VDC center pin is positive RER Connector wii smorord enva For MIC or LINE level output selectable via MIC LINE Switch Line Output ese tni esas EE A E a E EEE For 600 ohm balanced line output Mic Level Output 200 ohm balanced mic level output adjustable via Mic Level Control Controls Rear Panel EERE N T E N OREN E E EE O Controls mic level output to front panel XLR Connector Screwdriver adjustable rotary type ENED MIC SWI areen CENNAIS Slide switch that selects LINE or MIC level output for front panel XLR connector Screwdriver adjustable Compandor IN OUT esr eaey E ea Slide switch that controls compandor operation Must be set to match transmitter operation Screwdriver adjustable Channel A B C D i reireroiuscirecaianin RF Channel operating frequency selection Must be set to match transmitter channel or frequency Screwdriver adjustable rotary type Battery Relegem ori iE eNi atic rA DE EA EATE Squeeze to release slide locks Internal battery holder pops up through top of case ENG 4 Specifications ES e VAE EE iat E E T E P OER T E E r EO E Single conversion superheterodyne THERE TIS TU y RANEE ins cic cinco r a ws a a A E e EA A renee A ARS 150 216 MHz Any 1 of 4 frequencies selectable by external switch 0 005 crystal stability WET o a aD AAN TERA Frequency modulation 12 kHz Nominal
18. owing exceptions Place the output level switch in the LINE position A 2 conductor phone plug will be needed on the Mixer Amplifier end of the audio cable to connect to the inch line input jack See Figure 11 After you have selected either MIC or LINE operation turn the Monitor Level Control down counterclockwise and attach a monitor earphone if desired Adjust listening level to suit NOTE MIC output is 200 ohms adjustable level via the MIC LEVEL Control LINE output is 600 ohms fixed level Set the Channel Selector Switch to match the transmitter 27049 A 013 TO AMPLIFIER Nxir CONNECTOR CABLE NOT SUPPLIED STANDARD XLR TYPE CONNECTIONS GROUND COMMON 2 AUDIO IN PHASE 3 AUDIO OUT OF PHASE Figure 11 LINE LEVEL Connection TRANSMITTER SET UP AND CONNECTIONS Battery Installation Insure that the power switch is in the OFF position Depress the two spring latches See Figure 12 on each side of the case Pull the front panel assembly forward until the transmitter is removed from the case Insert the battery as shown in Figure 12 making sure the proper polarity is observed 27049 A 005 DEPRESS BOTH BATTERY COMPARTMENT RELEASES WHILE PULLING ON THE BASE TO REVEAL THE BATTERY COMPARTMENT BATTERY Figure 12 CompandorIN OUT Determine whether it is desired to operate with the compandor IN or OUT Basically this is a personal choice Some operators p
19. refer to operate with the compandor OUT even at the expense of signal to noise ratio and other advantages of compandor operation In any case place the internal compandor switch See Figure 5 to the IN or QUT position as desired NOTE Double check to be sure that the receiver compandor switch is in the same position as the transmitter either IN or OUT Microphone Connection Reinsert the transmitter into the case until the latches are secure Plug the microphone into the transmitter Refer to Figure 13 If the microphone brand that you are using is other than Telex request Technical Bulletin No PA 84 1 for interface information Using the screwdriver provided set the Frequency Switch to A or B to match the receiver Battery Check Set the power switch to the ON position Note that the battery LED gh i ici a 5 labeled LOW should flash one time on a good 1 SHIELD 27049 A 010 battery A poor battery will cause the LED to be 1o PEREIS illuminated continuously and a bad or unusable 4 NC a er eens battery will not cause any illumination at all Set the power Switch to the OFF position Refer to Figure 4 Assuming that you have set up the receiver previously proceed to the Setting System Gain Levels section Figure 13 Microphone Connection SETTING SYSTEM GAIN LEVELS Introduction If you have followed the Transmitter Gain Setting instructions up to this point you shoul
20. ter selected to provide interference free operation Up to seven systems can be operated in a single location simultaneously without intermodulation OFTEN ASKED QUESTIONS Question Can more than one microphone be used simultaneously ae Yes but never on the same fre quency You will need to have different fre quencies for every receiver transmitter combination All units are factory set for specific frequencies Ohoestion Is the system more sensitive in any one particular direction Aga No the transmitter s antenna radiates equally in all directions but the sig nal is attenuated by your body walls or other surrounding objects The receiving an tenna is essentially sensitive in all directions as well except when using a directional an tenna Kestim Can the receiver receive other transmissions when the transmitter is turned off Ay Yes it can The Telex ENG 4 sys tem operates in VHF band between 150 216 MHz However it is not susceptible to radio wave skip CB ers or standard FM radio transmissions 29 The frequency on which your system operates can be computer selected for least interference but there is no such thing as a 100 clear channel all the time anywhere in the U S A forever If the system is going to be used in a per manent fixed location the system should operate interference free until such a time or date when someone else begins using the same frequency If the system
21. y A dead or unusable battery will show no indication WT 400 Specifications TIPE ies ho gS is ees ee TR Ea THAD ONES Es CEN E Direct FM x 9 multiplication FROGUERCY RADE 6 000 0 0 rona aee 150 216 MHz one of two frequencies selectable from front panel switch A or B 0 005 crystal stability RE POMS RIOT ai gis a in Paine BA ESOC E eRe ee SS 50 mW maximum 45 mW typical MOHOR cn en ae sacked gt EA are Maw AORERE Frequency Modulated 12 kHz deviation Nominal 50 S pre emphasis Microphone Input 100 10k ohm dynamic or electret 5 volts bias available Microphone Gain Screw driver adjustable 0 007 V RMS input required for 100 modulation 1 0 V RMS maximum acceptable input MOTtaan On LAO S ooa be es ATE ES eo Internal Compressor Compandor System DRY oara EREE SEENA EAE Senses LNE aN EES E ES AEG 9 0 Volts nominal Current Grant aeo 56cm t s coends E ae Keach sence eraRuNomees cases 40 mA typical ENG 4 CONTROLS AND CONNECTIONS 27049 A 003 ROTARY FUNCTION SWITCH METER DISPLAY RF ARE 5 OFF 7 28 VOC FOR EXT OC REMOVE BATT 1 XLR RECEPTICAL Output to Audio yata i l EXTERNAL LLEVEL MONITOR POWER JACK CONTROL EARPHONE JACE ames BATTERY PACK Figure 2 Front Panel ENG 4 Antenna Jack BNC type receptical Refer to Antenna Connection Page 9 and Figure 9 External Power Jack For external power source 9 VDC to 28 VDC 100 mA Refer to Fi
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