Filter
Top Products
4-8
Maintenance
Block Diagram - RF PCB
RF AMP
Q21
1st MIX
Q22
FILTER
F3
1st IF AMP
Q23
2nd IF MIX AMP DET
IC9
DE-EMPHASIS
IC10
16.9MHz
BUFF AMP
Q25
OSC
Q24
MULT
49.54MHz
16.445MHz
FILTER
F4
70cH
AF OUT
BUSY 2
TONE DET
IC11
1050Hz
DET
FREQ ADJ
1st MIX
Q19
FILTER
F1
1st IF AMP
Q20
2nd IF MIX AMP DET
IC7
21.6MHz
BUFF AMP
D9 Q14
21.545MHz
FILTER
F2
ALLcH
AF OUT
BUSY 1
RF AMP
D12-D16
Q18
DE-EMPHASIS
( 1/2 )
IC8
DISC OUT
SQ INP
DC AMP
( 2/2 )
IC8
VCP
DIVIDER
L37
D/L SW
D11 Q17
RF AMP
Q16
LPF ANT SW
D1 D2
LOCK DET
IC5 D10
UNLOCK
PLL
IC4
LOOP FILTER
IC3 Q10-Q12
VCO
SW
D7 D8
VCO T/R SW
Q9
BUFF AMP
Q13
12.8MHz
CLOCK
DATA
LE1
LOOP SW
VCO T/R
RIPPLE
Q8
FILTER
IDC
IC6
MOD ADJ
BUFF AMP
Q2
DRIVE
Q1
POWER AMP
IC1
APC
IC2
MIC/DSC
Q3
D4-D6
Q5-Q7
ANT
HIGH
POWER
LOW
ADJ
RF DET
Q4
POW LOW
RF DET
DSC MOD
MOD ADJ
8V REG
IC12
5V REG
IC13
SW
Q28 Q29
POWER ON/OFF
RL1
6V REG
IC14
SW
Q33 Q34
SW
D19 Q30-Q32
T8V
R8V
PTT
R5V
6V
5V
8V
RF ON/OFF
RY ON/OFF
D17 D18
Q26
Q27
BATT +
BATT -
EXT +B OUT
SQ ADJ
D/L
455kHz
455kHz