Regency Polaris 88 The Regency Polaris 88 is a vintage marine VHF radio. Because it's not a very recent radio, channels 87 and 88 have been programmed as duplex channels, which enables the reception of AIS signals. The discriminator IC is, like the Regency Touch M100 scanner a 18 pin DIL-IC, marked with 'Regency 600-565'. The baseband audio can be found on pin 10. Regency Polaris 88
  Pin 10 of the 600-565 carries the unfiltered audio
The discriminator output
Follow the next steps to make the discriminator output:
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