Kenwood TK-7100 Service Manual page 18

TK-7100
■ Wide/Narrow Switching Circuit
The Wide port (pin 65) and Narrow port (pin 64) of the CPU
is used to switch between ceramic filters. When the Wide
port is high, the ceramic filter SW diodes (D303, D302) cause
CF301 to turn on to receive a Wide signal.
When the Narrow port is high, the ceramic filter SW di-
odes (D303, D302) cause CF302 to turn on to receive a Nar-
row signal.
IF_IN
CF301
(Wide)
CF302
(Narrow)
D303
Narrow
IC101 64pin
Fig. 3 Wide/Narrow switching circuit
■ AF Signal System
The detection signal from IF IC (IC301) goes to D/A con-
verter (IC161) to adjust the gain and is output to AF filter
(IC251) for characterizing the signal. The AF signal output
from IC251 and the DTMF signal, BEEP signal are summed
and the resulting signal goes to the D/A converter (IC161).
The AFO output level is adjusted by the D/A converter. The
signal output from the D/A converter is input to the audio
power amplifier (IC252). The AF signal from IC252 switches
between the internal speaker and speaker jack (J1) output.
IC301 IC161
W/NO
(EVOL2)
D/A
IF IC
CONV.
Fig. 4 AF signal system
IC401 : PLL IC
PLL
DATA
16.8MHz
18
CIRCUIT DESCRIPTION
IC301
IF System
MIX_O
R318
Wide
IC6 65pin
R317
D302
IC251 IC161 IC252
AF D/A
AF PA
Filter CONV.
5kHz/6.25kHz
1/N
Phase
comparator
REF
OSC
1/M
5kHz/6.25kHz
■ Squelch Circuit
The detection output from the FM IF IC (IC301) passes
through a noise amplifier (Q301) to detect noise. A voltage is
applied to the CPU (IC101). The CPU controls squelch ac-
cording to the voltage (SQIN) level. The signal from the RSSI
pin of IC301 is monitored. The electric field strength of the
receive signal can be known before the SQIN voltage is input
to the CPU, and the scan stop speed is improved.
IC301
AFO
IF
SYSTEM
RSSI
PLL Frequency Synthesizer
The PLL circuit generates the first local oscillator signal for
reception and the RF signal for transmission.
■ PLL
The frequency step of the PLL circuit is 5 or 6.25kHz. A
16.8MHz reference oscillator signal is divided at IC401 by a
fixed counter to produce the 5 or 6.25kHz reference fre-
quency. The voltage controlled oscillator (VCO) output signal
is buffer amplified by Q410, then divided in IC401 by a dual-
module programmable counter. The divided signal is com-
pared in phase with the 5 or 6.25kHz reference signal in the
phase comparator in IC401. The output signal from the
phase comparator is filtered through a low-pass filter and
passed to the VCO to control the oscillator frequency. (See
Fig. 6)
■ VCO
The operating frequency is generated by Q406 in transmit
mode and Q405 in receive mode. The oscillator frequency is
controlled by applying the VCO control voltage, obtained
from the phase comparator, to the varactor diodes (D405 and
SP
D406 in transmit mode and D403 and D404 in receive mode).
The TX/RX pin is set low in receive mode causing Q408 and
Q407 to turn Q406 off, and turn Q405 on. The TX/RX pin is
set high in transmit mode. The outputs from Q405 and Q406
are amplified by Q410 and sent to the RF amplifiers.
LPF
D405,406
Charge
pump
D403,404
Fig. 6 PLL circuit
Q301
NOISE AMP D301
DET
Fig. 5 Squelch circuit
Q406 Q404
TX VCO
AMP
Q410
BUFF
AMP
Q405
RX VCO
Q407,408
T/R SW
IC101
SQIN
CPU
RSSI