TA-12B transmitter, MP-28B Modulator and RA10DA receiver details:
Transmitter Description  (80k)
Block Diagram  (40k)
Tuning  (91k)
MP-28B Modulator Circuit  (74k)
TA-12B Circuit  (51k)
Modulator and Receiver Description  (89k)
Receiver block diagram  (26k)
RA10DA Receiver circuit  (48k)