Tandy Radioshack Realistic PRO-2026 User manual
ervlce
PRO-2026
100-CHANNEL DIRECT ENTRY
PROGRAMMABLESCANNER
•
·.
..,
Catalog Number :20-148
CONTENTS
Page
Specifications 2
Block Diagram 4
Alignment Procedures 4
Troubleshooting 12
Printed Circuit Boards 14
Wiring Diagram .........................................................................................•.......................17
Electrical Parts List 18
Disassembly/Exploded View 34
Mechanical Parts List 35
IC and Transistor Voltage Chart 36
Semiconductor Lead Identification 38
Schematic Diagrams 39
IC Internal Diagram 43
11
©1992Tandy Corporation.
All Rights Reserved.
Radio Shack and Realistic are registered trademarks used by Tandy Corporation.
SPECIFICATIONS
General
12 Bands plus Weather Channel
100 channels (20 ch x 5 Banks)
to 29.7 MHz (10 Meter Amateur Band)
to 50 MHz (VHF Low Band)
to 54 MHz (6 Meter Amateur Band)
to 136.975 MHz (Aircraft Band)
to 144 MHz (Military Land Mobile)
to 148 MHz (2 Meter Amateur Band)
to 174 MHz (VHF High Band)
to 420 MHz (Federal Government Land Mobile)
to 450 MHz (70-cm Amateur Band)
to 470 MHz (UHF Standard Band)
to 512 MHz (UHF "T" Band)
to 956 MHz (Public Service Except Cellular Band)
29
29.7
~'i-l./
0'
f·'1
(./:1'
50
~'
-{,
I,
__.,
j
71/,[)
'~i
108
C/'1
rJ",ÀU~7
137
---.
j
'C'-
'
r,
rr '
-
CfS6.0
M
riL
~:~
406
420
450
470
806
Frequency Range:
Band Coverage:
Display:
Weather Service Channel (162.400 to 162.550 MHz)
LCD (With Back Light) 10 Digits and special Annunciator
(Bank 1 - 5, Police, FIRE/EMG, AIR, WX, MRN, SCAN, MAN,
PGM, MON, UO, PRI, DLY, SRCH ...
T,
P)
Keys (PROGRAM):
(OPERATION):
Controls/Switches:
Total1 set 12 keys ("0" to "9", "ENTER", ".")
Total 16 keys (Scan, Manual, UO Decimal/Delay, Limit, Priority,
WX, s, V, Clear, Marine, Police, Fire, EMG, AIR, Program,
Monitor)
Volume Control, with Power ON/OFF Switch
Squelch Control
External Jacks:
Internal Speaker:
Power Requirements:
ANT. Jack (BNC Type)
Earphone Jack (3.5
<1»
8ohm,3W
12VDC ±10%
Operating Temp. :
Size:
Weight:
- 4°F (-20°C) - 140°F (60°C)
W:
6-1/4" (160 mm) x H : 1-5/8"
(41
mm) x D : 7-3/8" (188 mm)
2.2 1b
(1
kg)
M~asurement
Conditions
Power Source:
Antenna Impedance:
Test Temperature:
Modulation Frequency:
Deviation:
Mean Signallnput Level:
Audio Output Load:
Standard Ret, Audio Output:
12VDC
50 ohm
77°F(25°C)
1 kHz
FM±3 kHz Dev. &AM 60% tor Aircraft Band
100 I!V
8 ohm Resistive Load
125 mW (1V)
-2-
Item Unit Nominal Limit
-.
Sensitivity (12 dB SIN)
VHF Low Band 30
-50.0
MHz /lV 0.5 2.0
VHF High Band 140.0 -170.0 MHz
/lV
0.7 3.0
UHF Band 410.0
-510.0
MHz /lV 0.7 4.0
Aircraft 118.0 -135.0 MHz /lV 1.6 8.0
Public Service Band 810.0
-950.0
MHz /lV 0.8 5.0
Threshold and Tight Squelch (SIN)
VHF Low Band at 40.0 MHz uvIdB
0.4/25
1.0 I 20
VHF High Band at 155.0 MHz
/lV/dB
0.5 I 25 1.2 I 20
UHF Band at 460.0 MHz
/lV/dB
0.4 I 25 1.8 I 20
Aircraft at 127.0 MHz uvIdB
0.4/15
2.0 110
Public Service Band at 860.0 MHz /lV IdB 0.9 I 25 3.0 I 20
Signal to Noise
VHF Low Band at 40.0 MHz dB 50 35
VHF High Band at 155.0 MHz dB 45 30
.,
UHF Band at 460.0 MHz dB 35 25
Aircraft at 127.0 MHz dB 45 30
Public Service Band at 860.0 MHz dB 33 25
Audio Frequency Response
-6
dB (at 155.0 MHz)
Low Hz 250 150 - 350
High Hz 2200 1500 - 3500
Audio Output Power (at 155.0 MHz)
Max. Output Power mW 1100 500
10% THD Output Power mW 970 400
..,
Distortion at 155 MHz, 1 mV Input %1.5 6
Modulation Acceptance at EIA RS-204-A kHz
±12
±5
Selectivity (155 MHz)
-6 dB kHz ± 11
±15
-50 dB kHz
±15
±20
IF Rejection at 155 MHz dB 60 50
.,
Residual Noise (at saOpen) mV 0.2 5
Scan Rate CH ISec. 14 12
Scan Delay Sec. 21- 3
Current Drain
(at tuil output)
mADC
420 300 - 500
(squelched)
mADC
230 300
(keep alive) /lA DC 3 50
Note: Nominal specs represent the design specs. All units should be abIe to approximate these - some will
exceed and some may drop slightly below these specs. Limit specs represent the absolute worst condition that
still might be considered acceptable; in no case should a unit tail to meet limit specs.
-3-
BLOCK DIAGRAM
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
L _
1
1
1
1
1
VLO.
29.0000-54.
0000
l
~
AIR'
10e.
0000-136.
9750
I5
1>
VHI.
137.0000-17".0000
ICD
UHF'
406.0000-512.0000
:
~
600 I
a06.
0000-823.9375
I
~
851.
0000-868.
9375
:
'96.
1125-956.
0000
:
~
1
CONV.
: t t
ICI1
:
1 1
1 "
ALIGNMENT PROCEDURES
5?501
I-----t-è,
PWR SW
1
1
1
2.
~
1
1
1i
1
.,
1
1
1J
Preparation tor Alignment
Change to Test
Mode:
Turn on the power switch while pressing and holding 3 buttons -
[gJ,
[[], and I
UOUT
I.
Confirm that test frequencies (Tabie 1 ) have been called to each memory channel.
Attention: Incorrect operating sequence or method often results in a display of the error indicator
"Error" or an incorrect indication of frequency.
Table 1
CH FREOUENCY CH FREOUENCY
1 30.05 MHz 14 66.450 MHz
2 40.84 MHz 15 76.825 MHz
349.90 MHz 16 87.425 MHz
4138.15 MHz 17 157.800 MHz
5162.40 MHz 18 482.3625 MHz
6 173.225 MHz 19 29.000 MHz
7 406.875 MHz 20 54.000 MHz
8453.25 MHz 21 806.000 MHz
9511.9125 MHz 22 857.200 MHz
10 108.500 MHz 23 888.9600 MHz
11 118.800 MHz 24 911.500 MHz
12 127.175 MHz 25 954.9125 MHz
13 135.500 MHz
Table2
CH FREOUENCY DC VOLTAGE(volts)
VHF(Low) Adjust 1 30.05 MHz
1.2±0.1
Confirm 2 40.84 MHz
5.4±0.5
Confirm 3 49.9 MHz
8.6±0.5
Confirm 4 138.15 MHz
3.6±0.5
Confirm 5162.4 MHz
9.2±0.5
Confirm 6173.225 MHz
11.2±0.5
Confirm 7 406.875 MHz
4.9±0.5
Confirm 8453.25 MHz
8.5±0.5
VHF (High) /UHF Adjust 9 511.9125 MHz 12.5 ±0.1
-4-
...--------------------------
Set
Frequency Counter
TO TP1
S.G.
Alignment of PLL
Test Equipment Required and Connections
• DC Power Supply : 12.0 V • Oscil/oscope
• Signal Generator: S. G. • Frequency Counter
Oscilloscope
DC Power Supply
12.0V
Alignment Procedure
Step
Presetto Adjustment Remarks
1CH
:24
CT4
• PLL adjustment.
•Connect oscilloscope and frequency counter to TP1
(R118).
•Adjust CT4 to 10.350000 ±0.00001MHz.
2CH
:25
CT6 •Adjust CT6 to 10.349850 ±0.00001MHz.
3CH
:25
No Alignment •Connect oscilloscope to TP1.
Check
tosee
if the waveform makes asinusoidal
wave and the peak to peak voltage is 450 ±100mV.
~
Alignment Point Locations (PLL and Main PCB)
R23
91GNOI
G-ITP11
R118
CT4~~CT6
-5-
S.G.
Set I I
1--7-1
ANT
èJ501 TO TP2
~
.....
z-:
4
.....
II
De
Power
Supply
1'711--7-1
qQ
L-
Alignment
of
VCO
Test
Equipment
Required
and
Connections
• DC Power Supply :12.0 V • Digital Voltmeter.
•Signal
Generator:
S. G.
Digital
Voltmeter
Alignment
Procedure
12.0V
Step
Presetto
Adjustment Remarks
•ConnectSG to ANT terminal.
1
CH:9
L23 ·Connectosellloscopeor DC voltmeter to TP2 (R52).
• Adjust L23 to 12.5±
0.1
V.
2 CH
:7,8
No Alignment • Checkif vce is at each channel voltage.
(Referto Table 2.)
3
CH:
4, 5, 6 No Alignment •Check if vce is at each channel voltage.
(Referto Table 2.)
4
CH:
1L22 • Adjust L22to 1.2Vat TP2.
5CH
:2,3
No Alignment •Check if vce is at each channel voltage.
(Referto Table 2.)
Alignment
Point
Locations
(PLL
and
Main
PCB) l
R52
cri
TP21
L22L23
DO
R23
crlGNOI
II I
-6-
Alignment of Discriminator
Test Equipment Required and Connections
•.
De
Power
Supply
:
12.0
V • Digital Voltmeter
•Signal
Generator:
S. G.
S.G. Set
Digital Voltmeter
ANT
J501
TD
TP3
Alignment Procedure
DC Power Supply
12.0V
Step
Presetto
Adjustment Remarks
CH:2
• Conneet SSG to ANT. terminal.
1SG : 40.84MHz L27 • Conneet digital voltmeter to TP3 (R132).
1mV No Mod. • Adjust L27 to 2.0 ±0.05V (OC).
CH
:24
2 SG : 911.5MHz CT4 • Adjust CT4 slightly to 2.0 ±0.05V (OC)
1mV No Mod. on voltage of TP3.
CH
:25
3SG : 954.9125MHz CT6 • Adjust CT6 slightly to 2.0 ±0.05V (OC)
1mV No Mod. on voltage of TP3.
Alignment Point Locations (Main PCB)
IGNOI
9R23
CT41ê}~CT6
ITP31
G-
R132
D
L27
-7-
Alignment of IF
Test Equipment Required and Connections
•
De
Power Supply : 12.0 V • Oscilloscope
•Signal
Generator:
S. G.
S.G. Oscilloscope
Set
ANT
J501 TO TP3
Alignment Procedure
De
Power Supply
12.0V
Step Preset to Adjustment Remarks
ca .12 • Adjust L9 to AF output maximum reading on
SG : 127.175MHz L9
2uV oscilloscope.
Alignment Point Locations (Main PCB)
L9
o
IGNOI
9R23
ITP31
CT-
R132
-8-
Alignment
of
Receiving
Test
Equipment
Required
and
Connections
• DC
Power
Supply :12.0 V •
SSVM
•Signal
Generator:
S. G. • SINAD
S.G. Set
ANT
J501 +
I-----+-n
PRESET:
SQUELCH
Minimum (counterclock wise)
SIGNAL
FM : 1 kHz, ±3 kHz deviation
AM : 1 kHz,
60°/6
moduJation
Audio
Output
Level:
125
mW
(1V across 8Q resistor)
Conneet
SSG
to ANT. terminal.
Alignment
Procedure
DC Power Supply
12.0V
Step Preset to
Adjustment
Remarks
CH:5
Volume • ConneetSSVM to audio output terminal.
1SG : 162.4MHz Control • Adjust volume control to 125mW
O.4IlV,FM
(1
V across se resistor).
CH:5
• Conneet SINAD meter to audio output terminal.
2SG : 162.4MHz L16,L19 • Adjust coils to the best SINAD.
O.4IlV, FM • Then adjust SSG to 12dB SINAO level and check
if the output voltage of SSG is less than O.8IlV.
CH:2
• Conneet SINAD meter to audio output terminal.
3 SG : 40.84MHz L14, L18 • Adjust colls to the best SINAD.
O.3IlV, FM • Then adjust SSG to 12dB SINAD level and check
if the output voltage of SSG is less than O.8IlV.
CH:8
CT1, CT2,
4SG : 453.25MHz •Same as step 2.
O.6IlV, FM CT3 •Adjust CT1, CT2, CT3, to the best SINAD.
-9-
[@)CT3
@DCT2
Step Preset
te
Adjustment
Remarks
CH:
7, 9
5SG : 406.875MHz CT3 •Adjust CT3 to equal SINAD for CH7 and CH8.
511.9125MHz
0.6I!V, FM
CH:
7, 8, 9 No Alignment •Confirm that 12dB SINAD sensitivityis less than
6
SG:FM
1.01!V
for each channel.
7CH : 21, 23, 25 No Alignment • Confirm that 12dB SINAD sensitivity is less than
SG:FM
1.01!V
for each channel.
CH : 10, 11, 12, 13 Aircraft
8
SG:AM
No Alignment •Confirm that 12dB SINAD sensitivity is less than
1.61!Vfor each channel.
Alignment Point Locations
L14 L16 CT1
D D lé'I
R52 §
9'ITP21
DU8
~L19
o
L9
-10-
'<...}/
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