Kenwood TK-5210G Service Manual page 25

8. Signaling Circuit
8-1. Encode (QT/DQT/DTMF/2TONE /MSK)
Each signaling data signal of QT, DQT, DTMF, 2TONE and
MSK is generated by the DSP circuit, superposed on a mod-
ulation signal and output from IC10. The modulation balance
of the QT/DQT signal is adjusted by the D/A converter (IC502)
and the resulting signal is routed to the modulation input of
the VCO and VCXO (X301). The each deviation of the TX QT,
DQT, DTMF, 2TONE and MSK tone is adjusted by changing
the output level of the IC108 and the resulting signal is rout-
ed to VCO and VCXO. The RX DTMF tone is routed to the
receive audio signal system, and is output from the speaker.
8-2. Decode (QT/DQT/DTMF/2TONE/MSK)
The audio signal is removed from the FM detection sig-
nal by ASIC (IC10), and resulting signal is decoded by DSP
(IC3).
9. Compander Circuit
The term "compander" means compressor and expand-
er. The compander reduces noise by utilizing a compressor
and an expander. The transceiver contains a DSP (IC3) to
perform this operation. The transceiver compander can be
turned on or off using the FPU.
CIRCUIT DESCRIPTION
TK-5210 ( G )
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