Circuit arrangement for the evaluation of the pilot in carrier frequency systems

摘要

In this arrangement, the received pilot controls a group amplifier. The pilot DC is applied to a first alarm generating circuit. To achieve that a keyed pilot can be evaluated without influence from channel signals, the settling times of the pilot rectifier arrangement are shorter than the keying interval of the keyed pilot. The pilot DC is applied to a second trigger circuit which responds to the keying interval of the keyed pilot. Both alarm generation circuits are logically combined with one another by an OR gate.