PRC677: Microprocessor Board

uProcessor board for PRC677A

The custom masked ROM microprocessor control all functions of PRC: e.g. channels frequency, modulation index, ATU and a low-pass filter.

The synthesiser chip and the prescaler are also on this board; the reference frequency also serves as a clock for the microprocessor.

A hybrid circuit, under microprocessor control, adjusts the level of modulation at various frequencies