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TC-700P Service Manual
12
TX: The signaling generated by MCU is sent to the baseband processor. After mixed with the audio, the
signal is sent to VCO.
RX: After passing through the baseband processor, the demodulated signaling goes to a filter and then
to the MCU for decoding.
(
3
)
MSK
TX: The MSK signaling generated by the baseband processor is mixed with the demodulated audio
signal, and then sent to the VCO for modulation.
RX: The demodulated MSK signaling is amplified and sent to AK2346 for processing. Then the
signaling
is sent to MCU for decoding.
(
4
)
AF
TX: After amplified, the audio signal from MIC is sent to the baseband processor for further
amplification
and pre-emphasis, and then sent to the VCO for modulation.
RX: After amplified, the demodulated audio signal is sent to the baseband processor for further
amplification and de-emphasis, and then sent to the audio amplifier to drive the speaker.
The baseband processor AK2346 can realize functions such as Amplify,
Compandor, Amplitude Limit for the signal.
7. Control Circuit
U605 (CPU) operates at 9.8304MHz, and controls RX circuit, TX circuit, control circuit, as well as data
transmission among the peripheral circuits.
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