TK-3202
6
■
Attaching the antenna receptacle to the chassis
Screw the antenna receptacle to the chassis in the order
shown in the drawing so that the antenna receptacle
comes to the center of the case hole.
DISASSEMBLY FOR REPAIR / CIRCUIT DESCR
I
PTION
■
The nuts of the volume knob and channel knob
Note that the shapes, materials and heights of nuts of the
volume knob and channel knob are different from one an-
other. (The nut of volume knob is stainless steel, and the
nut of channel knob is brass.)
Use the following jig when removing the nuts of the vol-
ume knob and channel knob.
Jig (Part No.: W05-1012-00)
Tighten this screw first
Tighten this screw second
Volume Knob
(Stainless steel)
Channel Knob
(Brass)
ANT
TX/RX : 440~470MHz (E)
400~430MHz (E3)
ANT
SW
RF
AMP
TX
AMP
RF
AMP
1st MIX
MCF
38.85MHz
CF
450kHz
IF
SYSTEM
AF
AMP
SP
RX:
401.15~
431.15MHz (E)
361.15~
391.15MHz (E3)
PLL
VCO
MIC
AMP
MIC
TX: 440~470MHz (E)
400~430MHz (E3)
38.4MHz
X3
multiply
TCXO 12.8MHz
1. Frequency Configuration
The receiver utilizes double conversion. The first IF is
38.85MHz and the second IF is 450kHz. The first local oscil-
lator signal is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the necessary
frequencies. Fig. 1 shows the frequencies.
Fig. 2
Receiver section
2. Receiver
The frequency configuration of the receiver is shown in
Fig. 2.
ANT
ANT
SW
BPF
PCTV
RF AMP
Q205
MIXER
Q204
IF AMP
Q203
BPF
PCTV 1st Local
MCF
XF201
IC201
IF, MIX, DET
IC301
AQUA-L
Q1
X3 multiply
X1
TXCO
CF201
2nd Local
12.8MHz
AF VOL
IC302
AF PA
SP
Fig. 1
Frequency configuration
■
Front End (RF AMP)
The signal coming from the antenna passes through the
transmit/receive switching diode circuit (D103, D104, D106
and D122), passes through a BPF (L229 and L228), and is
amplified by the RF amplifier (Q205).
The resulting signal passes through a BPF (L214, L212 and
L211) and goes to the mixer. These BPFs are adjusted by
variable capacitors (D203, D204, D205, D206 and D210). The
input voltage to the variable capacitor is regulated by voltage
output from the microprocessor (IC405).
TX-RX UNIT
Component side view
u
i
t
y
o
q
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w
!0
!1
e
■
Screw sequence for mounting the TX-RX unit to
the chassis
Attach the TX-RX unit to the chassis using the screws in
the order shown in the drawing below.
