Equipment information

Gates Radio Company M-5790 BC-1T Transmitter
Manufacturer:
Model:
M-5790 BC-1T
Date:
1961
Category:
Group:
Description:
1000/250W Broadcast Transmitter

Information

THE FOLLOWING SPECIFICATIONS ARE TYPICAL AND MAY VARY SLIGHTLY WITH VARIOUS MODES OF OPERATION: 1. Rated power output: 1000/250 watts. Capable of 1100/275 watts where directional systems induce losses. 2. Frequency range: 1600 Kc to 5^0 Kc at the frequency you ordered. 3. Power input: 230 volts, 3 wire, solid neutral, single phase, either 50 or 60 cycles. Provide #4 or larger primary wiring from entrance box to Transmitter. Transmitter will consume approximately 4000 watts at 100% modulation. 4. Frequency stability: + 10 cycles. 5* Audio input: + 12 db + 2 db for 100% modulation for both output powers. The output of a Gates SA-39B limiter should be correct for this. If other limiter or audio Amplifier is used, be sure and check output capabilities. 6. Input audio impedance: As supplied, 600 ohms, which will also match 500 ohm impedance. It may be connected for 150/250 ohms if desired. 7- Distortion: Rated at 3% from 50 to 10,000 cycles but capable of much better at many frequencies. 8. Noise: 60 db or better below 100% modulation. 9» Carrier shift: 3% or less between 0 and full modulation-provided wire size in Point 3 (above) is followed and R.F. load is correctly tuned. 10« R.F. output impedance: Will match loads from 50 to 70 ohms. An Antenna coupling unit is usually necessary to match the Antenna tower. OTHER HELPFUL DATA: (a) Provision for 2 vacuum type crystals and holders. If you wish a spare, order M5602, giving your frequency. (b) The inbuilt dummy Antenna will accept 100% modulation and is for 51*5 ohms. See Par. 4 under "How Can We Help You?" in the-back of this manual, entitled "Computing Power Output". The dummy Antenna is substituted for the tower. (c) THE TWO TOP SUCTION FANS can do their best in cooling performance by periodical replacement of the removable air filters located at the front bottom of the Transmitter. Order Type M5825 and two are required. The time cycle in replacing filters depends on dust conditions. Normally about three times annually.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
73
Size:
5.15 Mbytes (5396455 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
17 February 1961
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
14 May 2015
MD5:
ae5b5bcbdd8ee8b6e120da54ee08b9b6
Downloads:
773

Information

AIR FILTERS ... 18 Antenna COUPLING ... 16 AUDIO INPUT ... ... ... 7 CRYSTALS AND ADJUSTMENT ... 5, 17 DUMMY ANTENNA ... 9 FEEDBACK ... . 8 FILAMENT RHEOSTAT ... ... 16 FLOOR WEIGHTS ... 3 FREQUENCY MONITOR ... 6 GROUND SYSTEM ... 4 INSTALLATION HINTS ... 3 INTERMEDIATE POWER Amplifier ... 9 METERS ... 18 MODULATION MONITOR ... 7, MODULATOR BIAS, ADJUSTING ... 7, 16 NEUTRALIZING ... 6, 12, 13 PARTS LIST ... 1 thru 6 PLATE RHEOSTAT ... * 16 POWER Amplifier MD TUNING ... 6, 14 POWER SUPPLIES: HIGH VOLTAGE ... 9 INTERMEDIATE ... 9 MODULATOR BIAS ... 8 PRIMARY LINE ... 4 PROTECTION: MODULATOR ... . ... 8 POWER Amplifier ... 7 RELAYS ... 8, 18 READYING CHECK LIST ... 9 REMOTE CONTROL ... 9, 20,21 SPECIFICATIONS, TYPICAL ... 2 SUCTION FANS ... 2, 18 TEST EQUIPMENT ... 18 Transmitter BASE ... 3 TUBES ... 3 TUNE-UP PROCEDURE ... 11,12,14, 15 VOLTAGES, AND CURRENTS ... 14,16,22

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