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Enhanced talkgroup scan algorithm

  • US 5,214,790 A
  • Filed: 03/11/1991
  • Issued: 05/25/1993
  • Est. Priority Date: 03/11/1991
  • Status: Expired due to Term
First Claim
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1. A method for a radio to scan a conventional radio system and a trunked radio system, said conventional radio system emitting an unsquelch code, said trunked system including a control channel and a plurality of trunked channels and emitting subaudible low speed data signals, said trunked system control channel emitting one or more scan markers, each scan marker comprising an outbound signalling word which marks the start of voice activity for the trunked radio system, the method comprising the following steps:

  • (a) monitoring the trunked radio system control channel to determine all channel assignments;

    (b) thereafter, monitoring all trunked channels;

    (c) determining when it is time to monitor the conventional radio system;

    (d) when (c) occurs, then saving the identity of the trunked channel currently being received;

    (e) when the proper unsquelch code is detected on said conventional radio system, then monitoring the conventional radio system;

    (f) determining when it is time to return to the trunked radio system;

    (g) when (f) occurs, then returning to the trunked channel saved as in (d).

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