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Tram used their own boards. They didn't buy from Cybernet or Uniden like Cobra or Midland. The D-64 is PLL controled but has an odd chip. Not the PLL-02A the generation before had. The AM transmitter is series pass modulated. The audio chip is also an older oddball and not as robust as the TDA7222AP. Performance was decent but easily surpassed by the first generation MB8719 boards.
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