Block Diagram - Radio Shack PRO-197 Service Manual

25-54MHz
Switching
108-225MHz
225-406MHz
406-512MHz
764-1300MHz
ANT
Attenuator
BPF
J1 D1,D2
Switching
Q5,Q6
Band Select
Switching
Att. Control
Q1
IC1
Voltage
Regulator
IC309
Flash
Memory
IC311
Shift
Resister
CODEC IC312
IC313
LED
Keyboard
Q2
RF Amp
(380.650-380.86875MHz)
Q3,Q4
1st Mix
IC2
RF Amp
Q7
AGC Amp
Q8
12.75MHz
X 1
Buffer
Oscillator
Amp
IC4
Q24
Switching VCO1 PLL
Q21 Q20 IC4
Low-Pass
Switching VCO2
Filter
Q23 Q22
Q25,Q26
Voltage
Voltage
X302 Regulator
Detector
18.432MHz IC308
IC303
DSP
IC310
CPU
IC307
LED Driver
Q302,303
304,306,307
11.0592MHz
LCD
X301

BLOCK DIAGRAM

1st IF
XF 1
2nd Mix 2nd IF Amp
Q9 Q10
Switching Switching
Q14,D23
Q13,Q17
Buffer
Amp
2nd IF Amp
Q30
Q15,Q16
VCO3
Q29
Detector,
Comparator
D27,28,IC3
Low-Pass
Filter
Q27,Q28
Switching
Q18,Q19
DC-DC
Converter
IC5
Memory
IC301
Low Speed
Data Filter
IC304,305b
WX Alert Data
Filter
IC306a,b
Hi Speed Data
Filter
IC305a
Reset
Q305
SAME Data
Filter
IC306c,d
Zeromatic
4
2nd IF
21.4MHz
XF 2
3rd IF Amp Noise Amp
3rd Local Mixer
Quadrature Detector
IC7
X2
20.945MHz
Ceramic
Buffer Amp
Filter
IC8b
3rd Local CF1
Swithing
455kHz
IC9c,9d
Ceramic
Filter
CF2 AM/FM
Switching
AGC Amp
IC9a,9b,10a,10d
Q11
Filter
Switching
Q31
Switching
Q12
Audio Amp
IC11
3.3V
Voltage
Regulator
IC12
Regulator
B+ (8V)
Switching
IC13
Noise Amp
IC6a
SQUELCH
VR201
Pre Amp
IC8a
VOLUME
Mute
IC10b,Q32
VR202
Power SW
J201
J202
PC/IF
J2 EXT SPK
Speaker
J3 PWR
13.8V DC