Kenwood TS-60S Service Manual page 10

CIRCUIT DESCRIPTION
IC3 KCDOB
1
1
1 1
-
..
Y
+
L T I
SSB. AM. CW
IC2 KCDO4
-
F M
S M
FM
Fig. 9 S-meter and AGC circuits
Transmitter Circuit Configuration
The audio signal from the microphone enters CN15
of the TX-RX unit. The signal then goes t o 0 3 8
(2SC3722K) of the microphone amplifier, and is split
and directed t o the SSB and FM systems. In the SSB
system, the signal, its gain properly adjusted by VR7, is
amplified by Q40 (2SC2712(Y)), balance-modulated
with the CAR signal (10695MHz) input from CN1l by
IC8 ( K P C ~ O ~ ~ H A ) , passed through 0 4 2 (2SC2712(Y)).
and sent t o the ciystal filter in the X48-3110-00 unit.
The SSB signal passing through the filter is amplified
by Q43 (3SK131 M).
The 62.35-MHz LO2 signal from the PLL unit is input
from CN3 of the TX-RX unit, and mixed with the
10.695-MHz signal amplified by Q43. 046, and 0 4 7
(3SK131 (M)) to produce
a
73.045-MHz signal. The LO1
signal from the PLL unit is input from CN2 of the TX-RX
unit, and mixed with the 73.045-MHz signal by 0 4 8
and 0 4 9 (3SK184(R)) to generate the desired signal.
The signal passes through the band-pass filter and is
amplified by 0 5 0 (2SC2954) to produce the drive out-
put, which goes t o the final unit from CN19.
The signal is amplified t o the appropriate power
level for the type by the final unit. Harmonic compo-
nents are attenuated by the filter unit, and the signal is
output from the antenna connector.
In FM mode, the audio signal amplified by micro-
phone amplifier Q38 and Q39 is input to CN1 of the
PLL unit, and passes through the pre-emphasis and
IDC circuit ofIC201 t o modulate LO2 (6235MHr).
In A M mode, the signal is generated by unbalancing
the carrier of SSB balance modulator IC8.
In CW mode, Q59 of the TX-RX unit is switched by
the key, and the signal is input to IC1 of the digital unit.
The sidetone monitor signal is generated by X59-4000-
00 in the TX-RX unit, and output from the speaker. The
CW control signal is output from IC1 of the digital unit,
and input from CN17 of the TX-RX unit to switch 0 4 6
and 0 4 7 and generate the CW signal. (Fig. 10)
I