Amplifiers – With pilot frequency control means
Patent
1996-05-31
1998-04-21
Mottola, Steven
Amplifiers
With pilot frequency control means
330129, 330289, H03F 366, H03G 330
Patent
active
057422028
ABSTRACT:
The automatic gain control circuit of the present invention improves upon conventional techniques using a pilot carrier for control by monitoring for the presence of the pilot carrier. If the pilot carrier level is at an undetectable level, it will switch control of the level control section of the automatic gain control circuit to the equivalent thermal setting by means of a switch. The switch connects the output of a temperature-sensing network to a Bode driving circuit that approximates attenuation of a given transmission medium over temperature. The gain setting will therefore be based on an approximation of what the cable losses should be at the detected temperature of the amplifier housing. The present invention provides dynamic gain adjustment, even in the event of pilot carrier signal loss.
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Massaroni Kenneth M.
Mottola Steven
Pezdek John Victor
Powers, III Frederick W.
Scientific-Atlanta, Inc.
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