Circuit arrangement for the measuring of group delay and attenua

Details Circuit arrangement for the measuring of group delay and attenua Circuit arrangement for the measuring of group delay and attenua

1975-10-14

1976-10-26

Safourek, Benedict V.

H04B 100

Patent

active

039886786

ABSTRACT:
This invention relates to slave controlled forward, reverse or third point measurements of at least one of group delay and attenuation distortions of any of a number of transmission sections connected in a measuring loop between a local transmitter and a local receiver. A swept test carrier frequency signal and a fixed reference carrier frequency signal are amplitude modulated by the same modulating frequency and are applied to the transmission section under test in a periodically alternating sequence. After passing through the transmission section under test, the thus generated envelopes of both signals will have suffered a time delay as well as an amplitude degradation caused by the frequency dependent group delay and attenuation characteristics of the transmission section under test. If a remote transmission section should be measured, a remote control signal is supplied from the local transmitter to the remote receiver-transmitter set, which specifies parameters of the test signal to be delivered by said slave controlled remote transmitter. If an envelope signal detected by a remote receiver should be retransmitted to the local receiver, a second control signal is supplied from the local transmitter to enable the respective remote transmitter to remodulate said envelope signal onto a carrier signal, the frequency whereof is the reference carrier frequency and the amplitude whereof is constant. The selection between remote control and remodulation modes of any remote receiver-transmitter set is solely made by means of those two control signals from the local transmitter without the need of any operator in any remote receiver-transmitter set.

REFERENCES:
patent: 3875500 (1975-04-01), Wallace

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