Broadcasting (Oct 1931-Dec 1932)

Record Details:

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keep your station on tlie' straight and narrow 39 GOVERNMENT ASSIGNED FREQUENCY . . . install a Western Electric Frequency Monitoring Unit! (Federal Radio Commission Approval No. 1453) In accordance Avith General Order No. 116 issued by the Federal Radio Commission, all broadcasting stations must be equipped for positively testing adherence to government assigned frequencies. The Western Electric No. 1A Frequency Monitoring Unit — holding approval No. 1453 from the Federal Radio Commission — accurately checks the frequency of radio transmitters. It incorporates . a precise source of radio frequency energy, which is used as a stand, ard for comparison, and an accurate meter for indicating deviation from the assigned frequencv. Input may come from either a modulated or an unmodulated source. Engineered by Bell Telephone Laboratories and made by Western Electric — pioneers in the field of precise crystal controlled frequency oscillators. Western Electric RADIO TELEPHONE BROADCASTING EQUIPMENT Distributed by GRAYBAR Electric Company \June 1, 1932 • BROADCASTING Western Electric No. 1A Frequency Monitoring Unit Consists essentially of Western Electric No. 700A Quartz Crystal Oscillator, two stages of screen grid amplification, detector and visual indicator which registers frequency difference between oscillator in transmitter and oscillator in monitoring unit. Distinctive Features 1. All apparatus contained in a compact metal cabinet. Being a precision instrument, it is designed primarily for use on the operator's desk. Where desired it may be mounted on a standard 19" rack by means of a shelf which the Western Electric Company has available. 2. All A. C. operation. Complete power apparatus included for operating from either 110 or 220 volt supply. No "A" or "B" batteries. 3. Improved modern temperature control circuit. New gaseous relay tube avoids use of mechanical relay and danger of overheating. Fixed mercury thermostat requires no adjustment. 4. Flexibility. May be connected into any stage of the transmitter or used entirely apart from it by means of an antenna since accuracy is not affected by modulation. 5. Direct audible as well as visual indication of frequency difference is available. 6. Inherent accuracy. Actual frequency difference utilized directly without intermediate steps. Accuracy independent of aging of tubes and input level. Frequency scale open and effectually utilized. GRAYBAR ELECTRIC CO. Graybar Building, New York, N. Y. Gentlemen: Please send me full information and booklet on the Western Electric No. 1A Frequency Monitoring Unit. name ADDRESS CITY 6-32~| Page 25