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****** Page 1 ****** BOGEN@ A DIVISION OF LEAR SIEGLER, INC. MODEL RM350A FMIAM MONO RECEIVER DESCRIPTION The Bogen Model RM350 FM/AM Mono Receiver is a 35-watt receiver which may also be used as a multi-purpose paging arn- plifier. Inputs are provided for use with an auxiliary microphone, Bogen intercoms or with telephone lines, when used with ap- propriate accessories. In addition, the RM350 provides inputs for phono, tape/cassette deck and TV audio. Multiple outputs are provided for 4, 8, and 16 ohm speakers, 25 V and 70V constant-voltage systems. A front panel switch selects local and/or remote speaker systems. Tape and Booster outputs are a.lso available on the rear panel, OPERATING INSTRUCTIONS POWER The power on-off switch is part of the SPEAKER switch. To turn the receiver off, set switch to POWER OFF. The receiver is turned on in a-II other positions. SPEAKER SELECTION Rotate SPEAKER switch to LOCAL or REMOTE, depend- ing on which speakers you wish to use. If you want all speakers to operate, set switch to LOCAL REMOTE. AM RECEPTION Set FUNCTION switch to AM. The AM indicator LED will light. Rotate the tuning knob to the approximate frequency in KHz of the station desired. Clockwise rotation will increase the frequency. As the station frequency is approached, the signal strength meter will have more bars illuminated. Continue to rotate the knob until the peak is reached. FM RECEPTION Set FUNCTION switch to FM MUTE; the FM indicator LED will light. Rotate the tuning knob to the approximate frequency in MHz of the station desired. Clockwise rotation will increase the frequency. Carefully adjust TUNING knob until Tuning Meter is at the green (center) LED. NOTE Muting removes the annoying noise between FM stations. The muting circuitry may not distinguish a very weak signal from interstation noise. To tune in very weak stations, defeat the mute circuit by rotating the FUNCTION switch to FM. AUDIO SELECTION Set FUNCTION switch to either PHONO or AUX. The PHONO position selects the magnetic phono cartridge con- nected to the PHONO MAG jack on the rear of the unit. The AUX position selects the component (tape/cassette player, TV, etc.) connected to the AUX/INPUT jack. VOLUME The Volume control is used for all program sources except microphone. To increase volume, rotate control clockwise towards MAX position. To decrease volume, rotate toward MIN position. TONE The BASS and TREBLE controls determine the overall ton- al balance. With the controls in the mid position (detented), the audio response is normal or “flat”. To increase or decrease bass response, rotate BASS control toward MAX or MIN, re- spectively. To increase or decrease treble response, rotate TREBLE control toward MAX or MIN, respectively. MICROPHONE When not using a microphone, leave MICROPHONE con- trol at the in position. To use a microphone, pull out the con- trol. Rotate the control clockwise to increase microphone volume or counterclockwise to decrease microphone volume. NOTE It is not necessary to touch any other controls when using a local microphone. Pulling out the MICROPHONE control or closing an external mic precedence switch (shorting mic precedence remote terminals) automatically mutes all other program inputs.
****** Page 2 ****** INSTALLATION UNPACKING Inspect the shipping container for indications of improper handling. The Model RM350 was carefully checked before leaving the factory. Carefully unpack the carton and inspect the unit for damage. If it is damaged, make an immediate claim to the dealer or distributor from whom it was purchased. If the unit was shipped to you, notify the shipping carrier with- out delay and place your claim. POWER LINE CORD. The receiver has an ac line cord terminated in a three-prong plug. Connect the plug to a three-wire grounded outlet providing a nominal 120v acj 60 Hz power source. If only a two-wire outlet is available, use an adaptor (such as Leviton No. 5017) to convert the outlet for use with three- wire plugs. A circuit breaker is mounted on the rear panel. Allow the unit to cool before resetting. AUXILIARY POWER RECEPTACLE. Model RM350 has an ac receptacle for supplying power to another component in the system. This receptacle is controlled by the power switch and any component connected to this receptacle can be turned on and off by the POWER switch on the Model RM350. Do not connect any component that requires more than 250 watts to this receptacle. HI-Z ANTENNA WKRE o 3000 FM ANTENNA FM 300 0 O GND DISCONNECT LINE ANTENNA O AM 1374-2873-01 Figure 2–Connecting Indoor FM Antenna, 300 ohm system EXTERNAL FM ANTENNA. If you are installing a standard 300-ohm antenna system, connect the twin-lead transrmssion line as shown in figure 2. If conditions require use of a coaxial transmission line, such as RG-11 or RG-59, connect the cable as shown in figure 3. Coaxial cable must be used when the transmission line is run in conduit. For optimum performance, a separate FM antenna is re- commended. If a TV antenna must be used for both FM and TV reception, install an FM signal splitter at the end of the transmission line, as shown in figure 4. ANTENNA DISCHARGE UNIT GROUND CLAMP INSULATOR INSULATED FM LEAD-IN r 3000 oo GND AM FM ANTENNA ANTENNA GROUND DISCHARGE CLAMP UNIT MAST GND WIRE 73 0 FM ANTENNA DOWNLEAD OR LEADIN WIRE RG 11 SHIELD OR RG59 FM 30001 GROUNDING ELECTRODE DRIVEN 8′ (2.44M) INTO THE EARTH B74-2 874-01 Figure 1 —Connecting Outdoor AM Antenna and FM Line Antenna ANTENNAS Articles 810 and 820 of the National Electrical Code, ANSI/NFPA No. 70-1978 provides information regarding an- tenna grounding. The RM350 is designed for connection to various antenna systems, as illustrated in Figures 1 to 4. CAUTION Use No. 8 AWG aluminum wire, or larger, as ground wires for both mast and lead-in and secure to building structure with insulators spaced from 4 to 6 feet (1.22m. to 1.83m.) apart. Mount antenna discharge unit as closely as possible to where lead-in enters building structure. FM LINE ANTENNA. The RM350 line cord may be as an internal FM Line Antenna for receiving FM broadcasts (see fig. l). For improved reception, particularly in weak signal areas or for tuners mounted in consoles or racks, installation of an outdoor FM or “T” antenna is necessary. IMPORTANT Always disconnect the FM Line Antenna when using an external FM antenna. GROUND -e- CLAMPS GND GROUNDING ELECTRODE DRIVEN 8′ (2.44M) INTO THE EARTH DISCONNECT LINE ANTENNA oo AM B74-2871-Oi Figure 3–Connecting Outdoor FM Antenna, 75 ohm system AM ANTENNA. A high-Q ferrite loopstick antenna, located on the rear of the unit, provides for receiving normal or strong AM signals. Rotate the antenna in a horizontal plane only, to avoid damage to the mechanical linkage. No connections are necessary for AM reception with this antenna. For weak signal areas or for receivers enclosed in a metal rack, connect a standard outdoor antenna to the AM terminaL as shown in figure 1. AUDIO INPUTS PHONO MAG. The PHONO MAC jack is designed to accom- modate the low-level output from a magnetic phonograph cartridge. Use a single-conductor, low-capacity, shielded cable terminated in a standard phono plug (Bogen 85-1005-01, or equivalent). Stereo phono cartridges should be paralleled with a “Y” connector, then connected to the RM350. 2
****** Page 3 ****** TV ANTENNA GROUND CLAMP ANTENNA DISCHARGE UNIT MAST GND WIRE DOWNLEAD OR LEAD-IN WIRE DISCONNECT LINE ANTENNA o GND o AM 3000 TWIN LEAD GROUND CLAMPS GROUNDING ELECTRODE DRIVEN 8′ (2.44M) INTO THE EARTH TV/FM SIGNAL SPLITTER TO TV SET B74-2872-01 Figure 4 —Connecting Outdoor TV/FM Antenna AUX INPUT. This jack is designed to receive an input from a high-level (0.1 V) source such as a tape recorder having a built- in preamplifier or the sound section of a YIV receiver. Use a single-conductor shielded cable terminated in a standard phono plug (Bogen 85-1005-01, or equivalent). HI-Z MICROPHONE. Any high-impedance dynamic micro- phone may be connected directly to the MIC INPUT con- nection on the rear panel. Refer to figure 5. HI-Z MICROPHONE 1 1 1 1 BOGEN 85-0124-01 2 1 B74-2846-01 Figure 5A—Connecüng Hi-Z Microphone BOGEN 85-1024-01 LO.Z MICROPHONE 2-CONDUCTOR SHIELDED CABLE (BOGEN 1008 OR EQUIVALENT) 3 2 1 B74-2846-01 Figure Lo-Z Microphone LO-Z MICROPHONE. A low-impedance microphone may connected to the receiver by relcxating the switch (LO-Z or HI-Z selecting slide switch) to the low-impedance pcxition. HI-Z LOW-Z FRONT Figure 6 Relocating LO-Z/HI-Z Switch WARNING Removing the cover presents an electrical shock hazard. Only a qualified technician should perform this installation. l) Remove receiver cover. 2) Relocate switch to the LO-Z as shown in fugure 6. 3) Connect microphone as shown in fugure 5B. MICROPHONE PRECEDENCE. The microphone can take precedence locally, by pulling out the MICROPHONE switch, or remotely by operating a switch connected across the MIC PREC REMOTE on the rear of the Model RM350. The switch on the microphone may be used if it is a double pole type or if an extra pair of leads for controlling an external circuit is available. STANDARD TELEPHONE PAGING. To connect a standard telephone line, a matching transformer — Bogen Model WMT- 1 —is required* For installation, see W MT-I Instruction Sheet (Bogen No. 54-5215), and make the necessary modifications for microphone input described therein. An additional pair of wires is required to provide a contact closure when the access number is dialed. These are connected at the precedence ter• minals, and are used to mute the program and turn on the microphone input. BOGEN PAGING mPUTS. The TIS/TIM INPUT jack on the rear panel may be used to permit pagain from TIS/TIM tele- phones or from IE intercoms. The telephone and intercom systems are available from Bogen as optional accessories. To connect any of these systems, remove the internal jumper and refer to the applicable installation instructions and drawing. Remove RM350 cover and cut the wire jumper between the TAPE OUT and the TIS/TIM jacks (see fig. 7). Replace cover and connect cables as shown in figure 8. TIS/TIM Intercom Phone. The use of a TIS or TIM series in. tercom phone requires installation of a Bogen TPA-I O Paging Adapter (see figure 8). These adapters permit the telephone page to override all other inputs to the RM350. TIS/TIM INPUT JACK CUT JUMPER TAPE oun JACK A74-2838-01 Figure 7—Modifying RM3SO for Telephone or Intercom Paøng
****** Page 4 ****** [E/lntercom. The use of a Series IE intercom requires in- stallation of a Bogen TBRe1A Paging Relay which allows the intercom page to override all other inputs to the RM350. After removing the jumper (as in figure 7) in the RM350, connect the RM350 to the TBR-IA, as shown in figure 13. If desired, one or two speakers in a constant ‘ioltage system may be wired to provide page replies back to the intercom system. These speakers must present an impedance of ap- proximately 5000 across the SPKR and COM terminals of the TRB-IA as shown. Speakers wired for page reply wül receive pages from any intercom master but will not receive program output from the RM3 50A AUDIO OUTPUTS CABLES. Low-impedance speakers may be connected with flexible line cord (zip cord) for distances up to 100 feet, or with unshielded twisted pair Bogen Type 1401 S, or equiva- IMP SEL 160/ 25 v 80 COM GND BOOSTER LOCAL t— REMOTE 70V GND LESS THAN 100′ SPEAKER BOGEN 1401s OR EQUIV A74-2879-01 lent). TO TIS/TJM JUNCTION BOX MODEL TPA- 10 MODEL RM.350 TAR BOGEN 85-1005-01 (Typ) SINGLE-CONDUCTOR SHIELDED CABLE B74-2878-01 Figure 8—Connecting RM350 to Bogen TIS & TIM Telephone System SPEAKERS. There are two terminal strips on the rear of the Model RM350 that permit connections to conventional 4, 8t or 16-ohm speakers, 25 V or 70V constant-voltage distribution systems. Refer to the paragraph applicable to your system. 4, 8, 16 Ohm Speakers 1) Connect IMP SEL lead to terminal of left-hand strip that corresponds to impedance of your speaker. Figure 9 shows the impedance connection for a 40 speaker and figure 10 shows the connection for an 80 speaker. 2) Connect one speaker lead to either LOCAL or REMOTE terminals on the second strip. This depends upon whether you want the speaker to operate from the LOCAL or REMOTE position of the speaker selector switch. Connect the other speaker lead to GND. Figure 9 shows a 40 speaker connected for local operation, while figure 10 shows an 80 speaker connected for remote operation. 3) Note the link between the COM and GND terminals in figures 9 and 10. This is the standard condition for un- balanced lines with one line grounded. If you wish to use two-conductor shielded cable, remove the link and connect the cable shield to GND. In this case, connect the speaker wire to COM, not GND. NOTE Refer to the “SPEAKER INSTALLATION” sheet (Bogen Publication 54-5001) for further details on constant-voltage systems. Figure 9—Matching 4-0hm I Speaker 25V & 70V Systems 1) Figure 11 shows the connections to a 25 VII 6-ohm con- stant-voltage system. The speaker leads may be connected to REMOTE or LOCAL, as required. 2) Figure 11 shows connection for a 70V constant-voltage system. The speaker lead may be connected to REMOTE or LOCAL, as required. CAUTION. Don’ t. operate when no load ! TAPE OUTPUT, The TAPE OUT jack may be used to record programs from the receiver. To do this, connect the input of a tape recorder to the jack, using a single-conductor shielded cable terminating in a standard phono plug. BOOSTER OUTPUT. If more output power is required than the 35 watts delivered by the RM350, the booster output may be applied to the auxiliary input of a standard PA ampli- fier or the Hi-Z input of a booster amplifier. The booster out- put is under control of the tone (Bass/Treble) controls and the Volume control and will provide a maximum of 5 V to a high* impedance input. To use the booster output, connect a single-conductor shieldedcable from the BOOSTER terminal to the PA or bo- oster amplifier. Ground the cable shield to the GND terminals With this arrangement, the RM350 may continue to be locaded to its full power and the booster amplifier may also be simul- taneously loaded to its rated output. IMP SEL BOOSTER 160/ 25 v 80 40 COM GND O LOCAL SPKRS REMOTE 70V GND LESS THAN 100 SPEAKER BOGEN 1401S OR EQUIV A74-2880-01 Figure 10—Matching 8-0hm Remote Speaker
****** Page 5 ****** BOOSTER e I—LOCAL SPEAKERS REMOTE 70v e GND COM GND NOTE IMP SEL 160/ 25 v 80 40 S GND 25V LINE-MATCHING XFMRS TWISTED PAIR SPEAKERS JMP SEL 160/25V LINE-MATCHING XFMRS T%QSTED PAIR SPEAKERS 80 COM GND BOOSTER SPEAKERS LREMOTE 70V GND Ø REMOVE LINK FOR BALANCED SYSTEM B74-17S9-01 Figure 11 —Matching 25V System REMOVE LINK FOR BALANCED SYSTEM B74-2881-01 Figure 12—Matching 70V Constant-Voltage SY8tem AUW INPUT O PHONO MAG TiS/ TIM INPUT O- TAPE OUT IMP SEL 160/ 25 v COM BOOSTER SPKRS REMOTE ……-…….l 70V UNBALANCED SYSTEM MUST BE USED WITH PAGE REPLY OPTION. IF PAGE REPLY IS NOT REQUIRED, ANY RMS50 SPEAKER CONFIGURATION MAY BE USED. MODEL TBR-IA LINE LINE CND 2 1 PAGE INPUT FROM IE MASTER STATION. SEE INTERCOM MANUAL OR TBR-IA INSTRUCTION SHEET I PRK-4S RACK PANEL BRACKETS o o S AUX MUSIC COM PA OUT MATCHING XFMR THAT PRFSENTS APP. 5000 to TBR-IA LINE-MATCHING XFMR LOCAL SPEAKER (NOTE 1) PROGRAM & PAGE REWfOTE SPEAKERS (NOTE 1) PAGE REPLY OPTION TALK-BACK SPEAKER (NOTE 1) i PAGE & REPLY C74-2882-01 Figure RM3 5 OA to Model TBR-IA for Intercom Paging The receiver may be installed in a standard 19 equipment rack* using Bogen Model RPK-47 Rack Mounting Brackets. DIAL CORD RESTRINGING Refer to figure 14 and proceed as follows: a) Remove front panel by pulling off knobs and removing four Phillips-head screws. b) Connect eyelet end of dial cord at lower drum hook shown in diagram. c) String dial around nylon pulleys and tuning shaft, as il- lustrated in figure 14, then times around drum and attach dial cord securely to upper drum hook. Make certain cord winds around tuning shaft from rear toward front. 5
****** Page 6 ****** MAINTENANCE WARNING There are no user-serviceable parts inside the unit and re- moval of the cover presents an electrical shdck hazard. Interior servicing should be attempted only by a qualified technician. BOGEN SERVICE We are interested in your Bogen receiver for as long as you have it. If trouble ever develops with your unit, please do not hesitate to ask our advice or assistance. Write to Service De- partment, Bogen Division, Lear Siegler, Inc., P.O. Box 500, Paramus, New Jersey 07652. When communicating with us, give the model number and series of your unit. Describe the difficulty encountered and the effect each operating control has upon the trouble symptoms. Include details on electrical connections to as- sociated equipment, and list such equipment. When we receive this information, we will send you service information if the trouble appears to be simple. If trouble requires servicing, we will send you the name and address of the nearest Bogen authorized service agency to which you can send your unit for repairs. When shipping your unit, pack it carefully, using the or- iginal shipping carton or similar container and filler material to prevent damage in transit. Send the unit, fully insured and prepaid, via any responsible carrier. The unit will be promptly repaired and returned to you. 6. ROLLER 1. DIAL DRUM 2. ROLLER 3. ROLLER 5. ROLLER 4. TUNING SHAFT turns) B74-2877-01 Figure 14 —Dial Cord Restringing 6
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****** Page 8 ****** ctn FROM FM IF GENESCOPE INPUT TERMINAL ALIGNMENT T202 COIL FM LO TRIMMER TRMIOI o TIM FM ANT O AM ANT FM RF LO TRIMMERS T201 AM LO COIL COIL The following instruments (or equivalent) are required for a complete alignment of the receiver. DC VTVM, RCA WV 98-C AC VTVM, HP 4m1) FROM FM IF GENESCOPE OUTPUT TERMINAL Figure 16—RF Section Circuit Board General Purpose Oscilloscope AM Signal Generator, Measurements Corp 65-B. FM Sweep Generator, Measurements Corp 88 or Boonton Radio corp 202H AM, FM IF Genescope. TABLE 1 — AM ALIGNMENT CHART Step 1 2 3 4 5 6 7 Band & Dial Setting Pointer at extreme right end of dial. Right end of dial Left end of dial. Pointer at 14m kHz. Pointer at 6m kHz. Genentor Freq. 455 kHz, mod at 4m Hz. Out- put level approx Freq. 1650 kHz, mod at Hz. Out- put level uv Freq.535kHz, mod at 4.m1–1z. Output level n uV. Signal Input Figure 16 Figure 16 Figure 16 Repeat Steps 2 & 3 above, until all outputs are peaked at the proper frequency. Freq. 14mkHz, mod at 4m Hz. Output level 5(X) uV. Freq. kHz, mod at 4m Hz. Out- put level uv. Figure 16 Figure 16 Indicator & Connection Signal strength meter as indicator Signal strength meter as indicator Signal strength meter as indicator Signal strength meter as indicator Signal strength meter as indicator Adjustment Adjust T202 and T 203 for max indication on meter. As a gain check, audio output should be approx. O.SV for an RF input of 20 u V. Adjust AM OSC TRIM for max indication on meter. Adjust T201 for max indication on meter. Adjust AM ANT TRIM for max indication on meter. Adjust AM ANT coil T503 for max indication on meter. Repeat Steps 5 & 6 above, until there is satisfactory tracking at both frequencies. PREPARE: l. Use a plastic ADJ. driver for all adjustment. 2. Function switch to “AM” 3. Volume to MINIMUM.
****** Page 9 ****** AM ALIGNMENT. To completely align the AM section, start with the last AM IF transformer and work back toward the antenna. In order to limit the effect of the AGC circuit, continually reduce the generator signal level to the minimum required for an output indication. Make the adjustments listed in Table 1. 2mPF FROM GENERATOR FROM GENERATOR 560 ISOQ 8 Figure 17 GND A-74-2437-01 —AM Antenna Test Figure 18—Dummy Antenna for FM Alignment FM ALKIGNMENT. To align the FM section, follow the procedure given in Table II, l. Connect generator as in Fig. 17; deviation ± 75 kHz at 2. Connect scope and AC VT VM at tape output jack. 3. Tune to extreme left and set the dial pointer to “O”. TABLE — FM ALIGNMENT CHART 1 2 3 4 5 6 7 DIAL POINTER Off station Right end of dial Left end of dial GENERATOR ouv 109 MHz level at 20 uv; increase if needed 87.5 MHz level at 20 uv; increase the level if necessary to see clean output CONNECTION 1. Connect generator as in Figure 17 deviation ± 75kHz at 2. Connect scope and AC VTVM at tape output jack. as above as above Repeat steps 2 and 3 until the proper tracking at both frequencies is obtained. 106 MHz 90 MHz MHz; reduce level as needed to keep the output signal appearing noisy MHz; reduce level as needed to keep the output signal appearing noisy. Repeat stpes 5 and 6 until maximum sensitivity is obtained. MUTING TEST 8 9 98 MHz Off station 1 mV ouv as above as above AC VT VM at output Function switch to “FM MUTE”. ADJUSTMENT Tuning meter should read zero. If not, adjust TS for zero reading. Adjust oscillator trimmer until clean Hz sine wave is visible and the tuning meter indicates center (green LED) Adjust osc. coil until clean 4m Hz sine wave is visible and the tuning meter indi- cates center (green LED) Adjust antenna and RF trimmers and IF Coils (T 103) for max. output or min. noise on scope. Adjust antenna Coil (T 101) and RF Coil 0102) and IF Coils 0103) for max. output or min. noise on scope. Read signal level Noise should be attenuated by at least 35 db from the previous reading
****** Page 10 ****** SAFETY INSTRUCTIONS l. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Read Instructions-All the safety and operating instruc- tions should be read before the appliancq is operated. Retain Instruction-The safety and operating instructions should be retained for future reference. Heed Warnings-All warnings on the appliance and in the operating instructions should be adhered to. Follow Instructions-All operating and use instructions should be followed. Water and Moisture-The appliance should not be used near water-for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc. Carts and Stands-The appliance should be used only with a cart or stand that is recommended by the manu- facturer. Wall or Ceiling Mounting-The appliance should be mounted to a wall or ceiling only as recommended by the manufacturer. Ventilation-The appliance should be suitated so that its location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings. Heat-The appliance should be situated away from heat sources such as radiators, heat registers, stoves or other appliances (including amplifiers) that produce heat. Power Sources-The appliance should be connected to a pqwer supply only of the type described in the operating instructions or as marked on the appliance. Grounding or Polarization-The Precautions that should be taken so that the grounding or polarization means of an appliance is not defeated. Power-Cord Protection-Power-suppiy cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the ap- pliance. Cleaning-The appliance should be cleaned only as re- commended by the manufacturer. Power Lines-An outdoor antenna should be located away from power lines. Antenna System-This receiver, tuner or tuner-amplifier is designed for connection to an antenna system, in- cluding outdoor antennas or community antenna televi- Sion (CATV) system, installed to provide some protec- tion against voltage surges and built up static charges. Section 810 and 820 of the National Electrical Code, ANSI/NFPA No. 70-1978, provides information with respect to proper grounding of the mast and supporting structure, the lead-in wire to an antenna discharge unit, and a coaxial cable system; size of grounding conducts, location of antenna-discharge unit, connection to grounding electrodes, and requirements for the ground- ing electrode. If an outside antenna is cönnected to the antenna terminal of the tuner; be sure the antenna system is grounded in a manner • similar to the accompanying Figure. (See Figure) EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE INSTRUCTIONS GROUND CLAMP tnWNIEAD OR LEAD.m WIRE a.b. ro RECEIVER MAST GROUND WIRE Use No. 10 ANTENNA 7 DISCHARGE UNIT GROUND CLAMPS GROUNDE•.JG ELECTRODE DRIVEN 8tNTO TI-U EARTH (2.44 METERS) AWG (5.33mm2) copper, No. 8 AWG B. C. 16. 17. 18. 19. (8.4mm2) aluminum or No. 1 7 AWG (1.0mm ) copper- clad steel or bronze wire, or larger as ground wires for both mast and lead,in. Secure lead-in wire from antenna to antenna discharge unit and mast ground wire to building structure with- stand-off insulators, spaced from 4 feet (1.22meters) to 6 feet (1.83meters) apart. Mount antenna discharge as closely as possible to where lead-in building sfructure. Nonuse Periods-The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time. Object and Liquid Entry-Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. Damage Requiring Service-The appliance should be service by qualified service personnel when: A. The power-supply cord or plug has been damaged; or B. Objects have fallen, or liquid has been spilled into the appliance ; or C. The appliance has been exposed to rain: or D. The appliance dose not appear to operate normally or exhibits a marked change in performance; or E. The appliance has been dropped, or the enclosure damaged. Servicing-The user should not attempt to service the ap- pliance beyond that described in the operating instruc- tion. All other servicing should be referred to qualified service personnel.
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