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GTR8000 P25 Repeater can 2 different NACs be programmed to a channel to trigger the repeater to relay the signal?

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casper809

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So we have a new digital public safety radio system that has 8 GTR8000 units that operate in Mixed Mode. On the analog side the 8 repeaters are programmed with the correct corresponding Standard interoperable CTCSS codes which has been standard practice for agencies in California for years. When the system's digital side was recently added the vendor appears to have basically shot from the hip and made up NACs instead of using the standard interoperable NACs that allow interoperabiltiy for outside agencies. So we have over 200 HTs 100 mobiles and 8 GTR8000 repeaters and a control station spread out over 6300 square miles that should be updated to correspond to the Standard NAC plan.

1684869304412.png

My thought is that if we can set up each repeater to relay traffic with either the currently programmed non-standard NAC, or the correct corresponding standard NAC then a fairly seemless transition can occur. First the repeaters would be reprogrammed by adding the correct corresponding NAC. Then the Control Station can be reconfigured to operate with the correct NACs. This will allow for gradually reprogramming the mobiles and handhelds over time as they will work both before and after being reprogrammed,
 
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casper809

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mikewazowski said:
You could always use:

  • 0xf7f ($F7F) - a repeater receiver set for this NAC will allow all incoming signals and the repeater transmitter will retransmit the received NAC.
Click to expand...
Actually that won't work because then transmissions to the other repeaters that I don't want to go through would re-transmit as well....
 
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kf8yk

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If you have the CA01950AA Multi NAC/Multi PL option you can put up to 16 different NAC/PL/DPL combinations on a single channel.

The CA01947AA Receiver Scan option should also work, put the old NAC on channel 1 and the new NAC on channel 2 then enable scan.
 
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