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Front and rear views of DeForest Frequency Monitor unit for broadcast station use.
DeForest Frequency Monitors and Control Units
TO the designs and specifications of the Radio Research Company, Inc., of Washington, D. C, DeForest adds engineering refinements and true craftsmanship in realizing the utmost precision in its Frequency Monitoring and Frequency Control Units. Precise visual means of determining frequency shift of a broadcast station during operation, from almost any part of the control room because of a large meter which allows wide-angle reading range, is afforded by the DeForest Frequency Monitor. Precise driving of a broadcast transmitter well within limits set by General Orders 116 and 119 is accomplished by the DeForest Broadcast Frequency Control.
Precision equipment — custom built to meet individual station requirements— not stock items built down to a price, these DeForest units are intended for broadcasters seeking to render the highest type service. Two outstanding features serve to eliminate the usual major sources of error in monitor crystals:
Crystals of Greater Accuracy
There are two kinds of monitor crystals available, namely, those cut on X axis and those on the Y axis. The latter are cheaper and can be employed in units built to a price. However, such crystals are more apt to possess spurious frequencies. The X cut crystal is more expensive but there is a minimum chance of frequency change. DeForest units employ X cut crystals exclusively.
Precise Temperature Control
Since the frequency of the controlling crystal is dependent upon temperature, it is of prime importance that the temperature control at the crystal be exact. To insure this prerequisite, DeForest groups the crystal, thermometer and thermostat in the double wall crystal box, and provides a fan arranged to maintain uniform temperature throughout the enclosure. This allows for very close control, as contrasted with the scattered components and still air of the usual double wall crystal box built to a price.
Front and rear views of DeForest Broadcast Radiophone Frequency Control unit.
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Technical data covering the DeForest line of Frequency Monitor and Frequency Control Units as designed by Radio Research Company, Inc., of Washington, D. C, is available to broadcasters and engineers writing on their firm letterheads. Also, the DeForest engineering staff is ready to cooperate on transmitting, frequency control and station synchronization problems.
DeForest Radio Company
Passaie, New Jersey
(AUDIONS)
RECEIVING AND TRANSMITTING TUBES
February 15, 1932 • BROADCASTING
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