The transmitter.
TR 20 (OSC) sends a 10.240 Mhz (Reference freq) signal to IC 3 (TX mixer). With the channel selector set to channel 1 a set of frequencies of 16.725 to 17.165 Mhz (fundamental freq) is also sent to IC 3. We now have our basic transmit frequency.
If we add:
16.725
+10.240
=26.965 Channel 1)
The signal is then passed to TR 16 (Buffer amp) TR 15 (Driver amp) and then to TR 14 (Final amp) From here it is sent to the antenna.
TX audio
The speech signal is pick up by the mic and carried to TR 17 (mic amp). This amplifies the speech signal and passes it off to IC 4 (audio chip). From there the signal is applied to the collectors of TR 15 and TR 16 for RF amplituse modulation.
__________________
RT.
|