9
TK-3402/3406/3407
CIRCUIT DESCRIPTION
1. Frequency Confi guration
The receiver utilizes double conversion. The first IF is
50.85MHz and the second IF is 450kHz. The fi rst Local os-
cillator is supplied from the PLL circuit.
The PLL circuit in the transmitter generates the neces-
sary frequencies. Figure 1 shows the frequencies
2. Receiver System
The receiver system is shown in Figure 2.
Fig. 1 Frequency confi guration
Fig. 2 Receiver system
TX/RX: 400~470MHz
34
9
.15~
41
9
.15MHz
400~470MHz
1st MIX
MCF
SP
MIC
CF
450kHz
ANT
ANT
SW
RF
AMP
IF
System
X3
Tripler
PLL
VCO
50.85MHz
50.4MHz
TX
AMP
RF
AMP
AF
AMP
MIC
AMP
Baseband
TCXO
16.8MHz
SP
ANT
IC400
IF,MIX,DET
Q404
1st MIX
ANT
SW
Q400
X3 Tripler
2nd Local
X1
TCXO
16.8MHz
Baseband
IC705
BPF1
BPF
Q405
RF AMP
XF400
MCF
Q403
IF AMP
IC70
9
AF PA
(INT)
BPF1
1st Local
BPF
CF401
2-1. Front End (RF Amplifi er) Circuit
The signal coming from the antenna passes through the
transmit/receive switching diode circuit (D201, D202, D203
and D204) and a BPF (L415 and L416), and is then ampli-
fi ed by the RF amplifi er (Q405).
The resulting signal passes through a BPF (L410,L411
and L413) and goes to the mixer. These BPF are adjusted by
variable capacitance diodes (D400, D401, D402, D403 and
D404). The input voltage to the variable capacitance diode is
a regulated voltage output from the DC amplifi er (IC704).
2-2. First Mixer
The signal from the front end is mixed with the fi rst local
oscillator signal generated in the PLL circuit by Q404 to pro-
duce a fi rst IF frequency of 50.85MHz.
The resulting signal passes through the XF400 MCF to
cut the adjacent spurious and provide the optimum charac-
teristics, such as adjacent frequency selectivity.
Содержание TK-3402
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