Circuit arrangement for protecting a control channel from...

Details Circuit arrangement for protecting a control channel from... Circuit arrangement for protecting a control channel from...

H - Electricity

04

B

325/36, 325/41

H04B 17/00 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 1180053

Abstract of the Disclosure: In a circuit arrangement of a control station in a radio communication system comprising a plurality of substations, such as a land mobile telephone system, a measuring circuit measures an intensity of electric field in an up control channel to the control station during each quiescent period of signals in the up channel to detect jamming waves. Each quiescent period preferably appears in the up control channel in response to selected control signals of a down control channel to the substations. On detection of the jamming waves, the con- trol channel is switched to a preselected one of speech channels between the control station and substations by switching circuits to use the preselected speech channel as a new control channel.

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