I bit the bullet and opened my PSR-500 and found the Discriminator. Being a GRE radio I took a wild guess and tried looking for a "TP-4" and sure enough, there it was on the main board an inch below the volume/squelch control.
I connected this to a CD-1 PL decoder and a data slicer and it worked as well as other radios for decoding PL, DPL, DTMF and 3600 baud trunked control channels.
To access this remove the four screws on the rear case after removing the battery and battery door. You may wish to use a pigtail type jack connection or try to mount a jack on the radio someplace.
Standard disclaimers: Your radio, your risk etc. This will probably void your warranty. Your mileage may vary. Void where prohibited or taxed and in Vermont. Winner responsible for taxes and fees.
I connected this to a CD-1 PL decoder and a data slicer and it worked as well as other radios for decoding PL, DPL, DTMF and 3600 baud trunked control channels.
To access this remove the four screws on the rear case after removing the battery and battery door. You may wish to use a pigtail type jack connection or try to mount a jack on the radio someplace.
Standard disclaimers: Your radio, your risk etc. This will probably void your warranty. Your mileage may vary. Void where prohibited or taxed and in Vermont. Winner responsible for taxes and fees.
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