Radio Shack PRO-197 User manual

PRO-197

Digital Trunking Base/Mobile Scanner

Catalog Number: 20-197

CONTENTS

Page

Specifications .................................................................................................................................................... 2

Block Diagram ................................................................................................................................................... 4

Alignment and Adjustment ................................................................................................................................ 5

Troubleshooting ............................................................................................................................................... 10

Printed Circuit Board ....................................................................................................................................... 15

Wiring Diagram ................................................................................................................................................ 20

Exploded View ................................................................................................................................................. 21

Mechanical Parts List ....................................................................................................................................... 22

Electrical Parts List .......................................................................................................................................... 24

Semiconductor Lead Identification ................................................................................................................. 66

Microprocessor (IC306) Port Format............................................................................................................... 72

Schematic Diagram ......................................................................................................................................... 73

RadioShack is a registered trademark used by RadioShack Corporation.

20-197

SPECIFICATIONS

Frequency Coverage 25.000-26.960 MHz 10 kHz steps (AM)

26.965-27.405 MHz 10 kHz steps (AM)

27.410-29.505 MHz 5 kHz steps (AM)

29.510-29.700 MHz 5 kHz steps (FM)

29.710-49.830 MHz 10 kHz steps (FM)

49.835-54.000 MHz 5 kHz steps (FM)

108.000-136.99166 MHz 8.33 kHz steps (AM)

137.000-137.995 MHz 5 kHz steps (FM)

138.000-143.9875 MHz 12.5 kHz steps (FM)

144.000-147.995 MHz 5 kHz steps (FM)

148.000-150.7875 MHz 12.5 kHz steps (FM)

150.800-150.845 MHz 5 kHz steps (FM)

150.8525-154.4975 MHz 7.5 kHz steps (FM)

154.515-154.640 MHz 5 kHz steps (FM)

154.650-156.255 MHz 7.5 kHz steps (FM)

156.275-157.450 MHz 25 kHz steps (FM)

157.470-161.5725 MHz 7.5 kHz steps (FM)

161.600-161.975 MHz 5 kHz steps (FM)

162.000-174.000 MHz 12.5 kHz steps (FM)

216.0025-219.9975 MHz 5 kHz steps (FM)

220.000-224.995 MHz 5 kHz steps (FM)

225.000-379.99375 MHz 6.25 kHz steps (AM)

380.000-419.9875 MHz 12.5 kHz steps (FM)

420.000-450.000 MHz 5 kHz steps (FM)

450.00625-469.99375 MHz 6.25 kHz steps (FM)

470.000-512.000 MHz 12.5 kHz steps (FM)

764.000-805.996875 MHz 3.125 kHz steps (FM)

806.000-823.9875 MHz 12.5 kHz steps (FM)

849.000-868.9875 MHz 12.5 kHz steps (FM)

894.000-939.9875 MHz 12.5 kHz steps (FM)

940.000-960.000 MHz 6.25 kHz steps (FM)

1240.000-1300.000 MHz 6.25 kHz steps (FM)

Unit Nominal Limit

Signal to noise ratio (FM and AM)

RF input: 100 μV 25-54 MHz dB 40 30

Dev. 3 kHz at 1 kHz 108-136.99166 MHz dB 40 30

Mod.: 60% at 1 kHz 137-174 MHz dB 40 30

216.0025-299.99375 MHz dB 40 30

300-512 MHz dB 35 25

764-960 MHz dB 35 25

1240-1300 MHz dB 35 25

Squelch sensitivity

at threshold (AM/FM) μV 0.5 2

at tight (FM) dB 25 15

at tight (AM) dB 20 10

Data decode sensitivity

WX Alert 1050 Hz tone 3 kHz Dev. at 162.4 MHz μV 0.3 1

Unit Nominal Limit

Signal Stalker II sensitivity at 450 MHz dBm -60 -50

Sensitivity

FM: (S+N)/N=20 dB 25-54 MHz μV 0.3 1

Dev.: 3 kHz at 1 kHz 108-136.99166 MHz μV 0.3 1

137-174 MHz μV 0.5 2

216.0025-224.995 MHz μV 0.5 2

225-299.99375 MHz μV 0.5 2

300-405.9875 MHz μV 0.8 3

406-512 MHz μV 0.5 2

764-960 MHz μV 0.7 3

1240-1300 MHz μV 0.7 4

AM: (S+N)/N=20 dB 25-54 MHz μV13

Mod.: 60% at 1 kHz 108-136.99166 MHz μV13

137-174 MHz μV 1.5 5

216.0025-224.995 MHz μV 1.5 5

225-299.99375 MHz μV26

300-405.9875 MHz μV310

406-512 MHz μV26

764-960 MHz μV26

1240-1300 MHz μV312

Selectivity AM 25-27.995 MHz -6 dB kHz ±4 >±2.5

-50 dB kHz ±6 <±12

Other frequency -6 dB kHz ±7 >±4.5

-50 dB kHz ±13 <±18

Spurious rejection (Except Primary image) at 154.1 MHz dB 40 30

Acceptable radio frequency displacement (EIA RS-204D) kHz ±6 ±3

Residual noise Volume control, set to its minimum, squelched mV 2 5

Scanning rate without trunking channels/sec. 55 45-66

Search rate at 162.25-167.25 MHz steps/sec. 90 80-100

Scan delay time Default setting sec. 2 1-3

Audio output power 10% THD W 1.5 1.0

Working memory 1,800 programmed object using flexible scannable object system

Display Liquid crystal display (16-charactor x 4-line, plus icon)

Receiving system Triple conversion PLL super-heterodyne,

1st IF: 380.8 MHz/2nd IF: 21.4 MHz/3rd IF: 455 kHz

Power source 13.8V DC negative ground only

Jacks Antenna, earphone, PC/IF, external speaker, and power

Dimensions (HWD) 2 1/4 x 7 1/4 x 5 5168 inches (55 x 185 x 135 mm)

Weight apporox. 42.3 oz. (1200 g) without antenna and batteries

Note: Nominal specs represent the design specs. All units should be able to approximate these specifications.

Some units will exceed while some may drop below these specs. Limit specs represent the absolute worst condition

still considered acceptable. A unit should NEVER fail to meet limit specs.

BPF

Attenuator

D1,D2

RF Amp

Q3,Q4

1st Mix

IC2

2nd Mix

2nd IF Amp

Q10

Noise Amp

IC6a

Ceramic

Filter

CF1

AGC Amp

Q11

AM/FM

Switching

IC9a,9b,10a,10d

Pre Amp

IC8a

Mute

IC10b,Q32

Audio Amp

IC11

Voltage

Regulator

IC12

Regulator

Switching

IC13

DC-DC

Converter

IC5

AGC Amp

Switching

Q5,Q6

Switching

Band Select

Att. Control

IC1

Switching

Q21

VCO1

Q20

VCO2

Q22

Switching

Q23

Buffer

Amp

Q24

PLL

IC4

Low-Pass

Filter

Q25,Q26

Buffer

Amp

Q30

VCO3

Q29

Low-Pass

Filter

Q27,Q28

LCD

Keyboard

CPU

IC307

Voltage

Detector

IC303

Memory

IC301

SAME Data

Filter

IC306c,d

WX Alert Data

Filter

IC306a,b

Hi Speed Data

Filter

IC305a

Low Speed

Data Filter

IC304,305b

Oscillator

IC4

3rd IF Amp Noise Amp

3rd Local Mixer

Quadrature Detector

IC7

Buffer Amp

IC8b

PWR

13.8V

Ceramic

Filter

CF2

Filter

Switching

Q31

25-54MHz

108-225MHz

225-406MHz

406-512MHz

764-1300MHz

1st IF

(380.650-380.86875MHz)

XF 1

2nd IF

21.4MHz

XF 2

20.945MHz

455kHz

3.3V

12.75MHz

X 1

11.0592MHz

X301

PLL Data

SQ IN

Filter SW

FM/AM/Digital

Mute

Keytone

3.3V

Data

Cont.Data

1st

Local

2nd

Local

Zeromatic

Switching

Q14,D23

Switching

Q13,Q17

2nd IF Amp

Q15,Q16

Detector,

Comparator

D27,28,IC3

SQ 2

B+ (8V)

LED Driver

Q302,303

304,306,307

LED

Reset

Q305

Switching

Q12

Scan Cont.

Search Cont.

Switching

Q18,Q19

ANT

DSP

IC310

Flash

Memory

IC311

CODEC

IC313

Voltage

Regulator

IC309

Voltage

Regulator

IC308

Shift

Resister

IC312

3rd Local

Swithing

IC9c,9d

3rd Local Cont.

Voice

X302

18.432MHz

SQUELCH

VOLUME

PC/IF

J201

Power SW

VR201

VR202

J202

J2 EXT SPK

Speaker

BLOCK DIAGRAM

ALIGNMENT AND ADJUSTMENT

ALIGNMENT AND TEST POINT

ALIGNMENT PREPARATION

Test Equipment Required

zOscilloscope

zDC SSVM

zFM signal generator

zFrequency counter (800 MHz)

Notes:

zUse non-metallic tuning tools.

zThe test equipment and receiver should be warmed up for at least 10 minutes before proceeding with alignment.

zThe signal level from the generator should be kept as low as possible to obtain a usable output.

zTo tune the frequency, press TUNE, frequency number including decimal point, then press ENT.

If you make a mistake, press CL to delete a single digit or hold CL about 2 seconds to start over.

Main PCB

TP1

TP6 TP4 TP5

VR1

VR4

VR3

VR2

VR5

TC1

L24

L23

L26

L18

TP2

TP3

ALIGNMENT PROCEDURES

PLL2 VCO Alignment

PLL1 VCO1 Alignment

PLL1 VCO2 Alignment

Table 1

Figure 1 Figure 2

DC SSVM

TP2Unit

Under Test

DC SSVM

TP3Unit

Under Test

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Adjustment of Coils L23, L24, and L26

Notes:

zBe very careful when doing coil pitch adjustment

because it greatly affects the frequency.

zSecure the coil with glue after alignment. Be sure

the glue is dry and the coil is secured. Also, be

sure that the environmental temperature is nor-

mal. Then, repeat VCO (PLL2 and PLL1) align-

ments on Page 6.

Each coil should be adjusted carefully by changing the

pitch of the coil little by little using a non-metallic tuning

tool as shown in Figure 3.

Increase the pitch of the coil when the measured volt-

age at TP2 or TP3 is higher than the voltage listed in

Table 2 for the PLL2 VCO alignment, PLL1 VCO1 align-

ment, and PLL1 VCO2 alignment.

Decrease the pitch of the coil when the measured volt-

age at TP2 or TP3 is lower than the voltage listed in Table

2 for the PLL2 VCO alignment, PLL1 VCO1 alignment,

and PLL1 VCO2 alignment.

Figure 3

Table 2

Reference Frequency Osc. Confirmation

Note: Care should be taken not to make any contact between TP1 and the shield case.

455 kHz FM Discriminator Coil Alignment

Figure 4

Figure 5

Use

non-metallic

tuning tool

PCB

Coil

Frequency Counter

TP1

Unit

Under Test

FM Signal

Generator

ANT. Jack

Unit

Under Test

DC SSVM

TP4

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Frequency Counter

TP5

Unit

Under Test

ANT

FM Singal Generator

IF (380.8 MHz) Trap Adjustment

FM Signal

Generator

ANT. Jack

Unit

Under Test

Oscilloscope

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Headphone

Jack

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Signal Meter Alignment

Figure 8

FM Signal

Generator Unit

Under Test

TP6

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DC SSVM

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Power ON

Is the display

normal?

Is EEPROM check

program OK? Defective IC301.

Defective IC307, LCD

and/or associated

circuit.

Is the voltage

of TP2 about 18 V at

960 MHz?

Defective

PLL circuit

(IC4) or

VCO

circuit.

Proceed to Microprocessor

check.

YES

Power on the scanner.

Press 0while the scanner shows -Welcom To-

Object Oriented Digital Trunking RadioShack.

The scanner shows System Tests: Select a

Test... Exits if no key is pressed. Then press 5.

The scanner shows EEPROM Test Erase

Momory ENTER if APPROVE CLEAR to EXIT.

Then press ENT.

The scanner shows Testing, and automatically

starts the EEPROM test program.

The scanner initializes the working memory.

Is the voltage

of TP2 about 20 V at

1300 MHz?

Is the voltage

of TP3 about 2.0 V at

512 MHz?

YES

EEPROM check program

procedure as follows:

Note: This procedure clears all information you

stored in the scanner's working memory.

TROUBLESHOOTING

Reception Check

Does the

display work

properly?

YES

Does display

freeze showing Waiting

for DSP or DSP

Loder ....

Proceed to DSP

section (Boot

section) check.

YES

The scanner shows GLOB EEPROM area

initialized to defaults. Press any key. Then press

any key.

The scanner shows Initializing the File system

then File system initialized to defaults. Press any

key. Then press any key.

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