Tandy Radio Shack Realistic PATROLMAN PRO-9 User manual

Please read befare using this equipment
OWNERS MANUAL
PROFESSIONAL
SERIES
PATROLMAN PRO-9
VHF 148-175 MHz FM TUNABLEjSCANNING
MON ITOR RECEIVER
Catalog No.
20-164

Contents
Page
1 - 2 General description and specification
3Installation
4-5
Front and Rear Panel Controls and
Operating Instructions
6Crystal Installation
7Block diagram
8Schematic diagram
GENERAL DESCRIPTION
Your Patrolman PRO-9 Tunable Scanning Receiver is a completely transis-
torized VHF FM single conversion superheterodyne receiver capable of autornati-
cally switching 7 crvstal-controlled channels. lts special circuit features consist of
a crystal filter, priority circuit, squelch control, channel lock-out circuit, scan delay
circuit and AC or DC operation.
It is designed for use in the narrow-band FM channels of public service
communications VHF band-police, fire, civil defense, forestry, weather and other
emergencies are just a few of the numerous services included in this band that
covers 148 to 174 MHz.
The PRO·9 Features both high sensitivity and selectivity, and a sophisticated
circuit which includes a 10.7 MHz filter which reduces or eliminates adjacent-
channel or strong-signal
interference which is experienced when operating in urban
and metropol itan areas or wh ere very strong and closelv placed signals are present.
An
important engineering achievement designed for practical appl ications, the
PRO·9 is remarkably easy to use, vet its up-tc-date. complex circuit consists of 41
separate transistors (one of which is an FET), seven integrated circuits are used in
the IF and Scanning sections along with 40 diodes and 2 zeners.
-1 -
GUARANTEE: The REAlISTIC guarantee is stated on the Fact Tag packed
with the equipment. It is in effect from coast to coast. At any time, REAlISTIC
equipment may be restored to new condition with original parts with MINIMUM
delay anywhere in the U.S.A., usually in your own neighborhood. It is NOT
necessary to return REAlISTIC equipment to our laboratories in 98% of the cases.
GENERAL SPECIFICATIONS
Note: These are given in general form only, since REAlISTIC does not believe
in
buying to or designing to numerical specifications. The latter are subject to
variables
not clearly related to performance, just as selectivity, the number of
transistors or IC's indicate in an average way the quality of a circuit but do not
prove one circuit will outperform another in real operating conditions. Our
philosophy is that apiece of equipment should be evaluated in terms of what it
does for the purchaser, its quality and relative value being based upon merit and
observed
performance in real Iife. Thus REALISTI C designs toward achieving a
certain r.esult ..... regardless of cost, regardless of lab measurements, regardless of
competitive advertising claims. Results are determined by your application of our
finished result. Good installation is extremely important since a poorly installed or
a
wrongly placed antenna can result in a 90% or even greater signalloss. And an
inadequate speaker system can be al most as effective in reducing equipment
performance. The following figures are offered only as a guide, not as a guarantee
of equipment performance.
This equipment is desiqned to operate from either 120 VAC or 12 VDC
negative ground. If it fails to operate, and there is no clear reason for the failure,
first check the supply switch. This switch entirely disconnects the supply
components that are not in use. Also, before connecting the PRO-9 receiver to a
DC
power supply, check the voltage polarities. Attempting to operate the
negative-ground PRO-9 from one of the rare positive-ground automotive or boat
electrical systems, or from a wronql, connected battery, will at least blow a fuse.
It may do further damage, so th at the expensive and time-consuming repairs are
necessary
befere the PRO·9 can be used again. The Radio Shack warranty
does not apply to any damage caused by this, inadequate lightning proteetion. or
other improper connections.

SPECIFICATIONS
•Frequency Range 148 - 174 MHz
•Frequency Coverage 8 MHz, max. sensitivity (156 MHz ±4 MHz)
•Tunable
operation 148 -174 MHz
• Scanning Speed 10 eh/sec,
•Sensitivity 0.7 microvolt for 20 dB quieting
•Selectivity -6 dB ±9 KHz
-40 dB ±20 KHz
•Spurious Rejection More than 50 dB
• Image Ratio
More than 30 dB
•
Modulation Acceptance ±7 KHz
• IF Frequency 10.7 MHz
• Filter 10.7 MHz Crystal Filter
• Squelch Sensitivity 11lV
• Audio Power 2.0 Watts
• Power
120 VAC or 12-15V DC,
Negataive
Ground Only
• Accessories Supplied Mounting Bracket, Bracket Screws, DC Pow-
er Cabie, and
Instruction Manual
SEMICONDUCTOR COMPLEMENT
Transistors
01
02
03
04,6
05,7
08,9
010, 11
012
013
014,15
016,42
017, 18
019
020
183015
183016
183016
2SC373
2SC735
2SC373
2SC535
2SK19
2SC394
2SC371
2SC371
2SC373
2SC373
2SC373
RF.
Ampl ifier
Mixer
Local Oscillator
Switching
Switching
Switching
Cascade RF Amplifier
Mixer (FET)
Local Oscillator
Switching
IF Ampl ifier
Noise Amplifier
DC Amplifier for Squelch
Delay
Circuit
-2 -
021 2SC373
Audio Amplifier
022 2SC373 Squelch
Control
023
2SC373
Audio Amplifier
024
2SC735 Audio Amplifier
025
2SD235 Audio Power Amplifier
026
2SB435
Audio Power Amplifier
027 to 34 2SC373
Switching
035
2SC373
Switching
036
2SC735
Switching
037,38
2SC373 Mu
Itivibrator
039
2SC373 Delay
Circuit
040,41
2SC1173 DC Voltage Regulator
IC (I ntegrated
Circuit)
IC1,2
TA7060
IF Amplifier
IC3
N7404A
DC Amplifier for Squelch,
DC
Amplifier for Switching
Circuit
IC4
N7400A
Multivibrator
IC5,6
N7473A
Flip-Flop
IC7
N7408A
Switching
Diodes
D1 to 4
HV-80 Switching
D5 02Z6.2A
Voltage Regulator
D6
02Z7.5A
Voltage Regulator
D7 to 13 1S73
Switching
D14,15 HV-80 Detector
D16, 17
1N60
Noise Detector
D18 1N60
Switching
D19 HV-80
Regulator
D20 to 31
1N60
Switching
D32 1S1885
Switching
D33, 34 1N60
Switching
D35 to 37 HV-80
Switching
D38 02Z10A
Voltage Regulator
D39
to 42 1S1885 Power
Rectifier
D43 1S1885
Polarity Protector
D44
02Z10A
Voltage Regulator

INSTALLATION
A good installation will make the most of the PRO-9's capabilities. Loss of the
tiny signal at the antenna is avoided by correct antenna adjustments and by
installing a good quality foam coaxial cabie. The antenna that you choose, and
how you install it, will have a great effect on how weil your unit will work.
BASE INSTALLATION:
An antenna, such as a ground-plane (Cat. No. 20-176) mounted as high above
the
ground as practical will greatly increase the signaI strength. For proper
input matching, a 50 ohm lead-in coaxial cable such as RG 58/u [Cat, No.
278-970) should be used. A Motorola type antenna adapter plug (Cat, No.
278-208, or equivalent to Cinch-Jones No. 13B or H.H .Smith No. 1200) will
have to be installed on the receiver end of the cable in order to utilize the
antenna connector located on the rear (back) panel of the unit.
,.
~
VHF Mobile Mount
Complete with cutting chart.
Covers 130-174 MHz. Snap grip
mounting. Fits top or side of
trunk lid. Omni-directional capa-
bility avoids fading as vehicle
changes direction. Waterproof.
Specific frequency adjustment.
17-7PH stainless steel whip. 17'
cabie.
20-177
,
j
J
Dual Band Cowl-Mount
For mobile use. Chrome tete-
scopic whip (55" extended, 36"
collapsedJ, mounted on swivel
base. Center loaded
weatherproof
coil. 5' RG-58/U cabie. Termi-
nates with pin-type plug.
To install the PRO-9 in a base installation, simply conneet the AC line cord into a
110 - 120V AC 60 Hz power source.
MOBILE INSTALLATION:
Safety and operating convenience are the primary factors to consider when
mounting any piece of equipment in an automobile. Be sure th at the Receiver
controls may be easily reached ev the operator. Also be sure th at connecting
cables do not interfere with the oparation of the brake, accelerator, etc.
The Receiver may be mounted to the underside of the instrument panel or
dashboard
of a car, truck, boat, etc., by means of the special bracket that is
supplied
with the Receiver.
Mobile Station: CAUTION:BE AWARE OF THE BATTERY POLARITY.
For avehicle with a 12V DC negative ground svstsm. use the DC power cable
supplied
with the unit. Simply conneet the cable into the cigarette lighter
receptacle (Cat. No. 274-331) or directly to the DC power supply source.
IMPORTANT: If your car has been burning out headlamps and other bulbs at a
rapid rate, have the voltage regulator checked for proper output. Excessive voltage
(more than 16 volts) may cause serious damage to your Receiver.
MOBILE ANTENNA
Keep the following points in mind when installing your mobile antenna.
1.
Mount the antenna as high as possible, mounting in the center of the roof is
the best possible location.
2. Mount it rigidly, so it wil! remain vertical while in motion.
3. Mount as far as possible from the engine compartment; mounting on the rear
of the car is preferabie to mounting in place of the AM antenna.
- 3-
MOBILE NOISE SUPPRESSION
Noise:
This receiver is very sensitive, and will piek up signals that are extremely weak.
With this extreme sensitlvitv, you wil! find that the receiver will amplify weak
signais,
along with anv noise th at may be present.
When
operating areceiver in a vehicle, you will find that the vehicle generates
noise, and
this noise can become very objectionable. Mobile oparation will not be
as
quiet as base station operation, but steps can be taken that will greatly improve
the noise situation.
Electrical System:
Generally speaking, noise can be generated bv any device or conneetion that
carries electrical current. Any device th at generates a spark should also be
suspected. Bypass
anv suspeered wire to ground with a high quality 1~f coaxial
capacitor.
Probably the next most common souree of noise is the generator, or alternator.
This type of noise will sound like amusical whine, and will also vary with speed
of the engine. Generator and alternator noise can usually be reduced bv placing a
coaxial-type capacitor from the armature terminal to the metal case.
Ignition System:
The ignition system is the most common souree of noise. This noise can be
identified by the fact that its speed varles with the engine speed. Ignition noise wil!
sound like a series of "poppinq" sounds, while that engine is idling, and will speed up
to a buzzing sounds as engine speed is increased.
There are a nurnber of th ings that can be do ne for th is type of noise.
1. Use
radio suppression-type ignition wire, and resistor spark plugs.
2. Check high-tension leads etc.
for leakage, cracks, etc.
Replace any old wiring.
3. In extreme cases, kits may be purchased, that will completely shield all ignition
wiring. This will provide maximum noise suppression.

FRONT AND REAR PANEL CONTROLS
FRONT
VIEW FIG-'
REAR VIEW FIG-2
-4 -
A -Power Switch and Audio Volume Control
B -Priority Channel Selector
C -Squelch Control
D -Manual Channel Selecter Switch
E -Priority Switch
F -Auto or Manual Selector Switch
G -Channel Switch (Ch, 1 - Ch.8)
H -Mobile Mounting Bracket
I -Easily Removable Knurled Mounting Screws
J
-Channel Indicator
K -Tuning Dial & Pointer
L -Tuning Knob
M -Tuner Switch
N -AC Line Cord
o -Motorola Type Antenna Jack
P
-Crystal Compartment
Q -RCA Type Tape Output Jack
R
-DC Power Jack
S
-External Speaker/Phones Jack

OPERATING INSTRUCTION
Set controls as follows: (Ref. FIG.-1 & FIG.-2)
1. VOLUME (A): OFF position
2. SQUE LCH (C): Minimum position (Counter-c1ockwise)
3.
AUTO/MANUAL (F): AUTO (pushed in)
4.
PRIORITY CHANNEL SELECTION (B): Any suitable position
5. PRIORITY (E): OFF (pushed out)
6. CHANNEL SWITCH (G): ALL ON (all 8 switches pushed in)
7.
ANTENNA JACK (0): Connect antenna to antenna jack
8. AC LI NE COR D (N): Line Cord into AC outlet (110-120V AC 60 Hz)
Volume Control with Power Switch (A):
The main power switch is located on the Volume Control. By rotating the
control in a clockwise direction, the set is turned "ON" and the volume can be set
to a
comfortable listening level by continuing the clockwise rotation. No waiting
time is necessary for warm-up.
Squelch Control (C):
The squelch eliminates background noise output until a signaI is received.
Slowly rota te the control clockwise (making sure there is no station transmitting
on the frequency) until the background noise just disappears. If the control is
increased past
this point (clockwise), it will take a much stronger signal to override
the squelch, thereby not permitting weaker signals to be heard. Your unit will now
start to scan.
Scan
Delay Circuit:
The Pro-ê has a built-in 2 second delay feature which virtually eliminates
missed replies. This circuit holds the monitor on the channel you are monitoring
for a period of 2 seconds af ter the signal has gone off the air before resuming
normal scanning operation. This circuit is fully automatic and can not be disabled.
Automatic Operation:
The Auto/Manual button (F) is pushed in for automatic scanning. To
activate a particular channel (provided there is a crvstal installed for that channet),
the push
button switch directly below the channel number (G) must also be
pushed in. In
addition, the receiver must be squelched for proper scanning action.
Turn the squelch control clockwise until all the background noise is just eliminated
from the speaker.
Manual Operation:
When the Auto/Manual button is out, the channel is selected manually. First,
activate the channel vou want to monitor. Then, push in, momentarily and release
the Manual Channel
Selector button (D). Repeat pushing in the Manual Selecter
Button until the desired channel number is lighted. Each time the Manual Selector
Button is pushed in, the Scanner moves over one active channel, unless there are
inactive channels (button out). The scanner will skip over these and go to the next
active channel. The receiver can be either squelched or unsquelched when manual
channel selection is used.
-5 -
TUNABLE OPERATION:
Set the Auto/Manual switch (F) in the Manual (out) position. Activate the
tuner section of the PRO-9 by pushing the Tuner Switch (M) in. Push and release
the channel selector button until the indicator light over tune and the dial light
come on. Set the Squelch Control (C) fully counter-c1ockwise, and adjust volume
Control (A) to a comfortable noise level. You can now tune manually from
148-174 MHz using the Tuning Knob (L) and by observing the tuning dial (K).
Since most VHF-FM stations do not transmit continuously, tuning should be done
very slowly to avoid missing a station.
Af ter locating the station you wish to monitor, wait for aNO-signal eendition.
then adjust the Squelch Control clockwise until the background noise just
disappears.
The
tunable receiver in the PRO-9 now acts like a crystal-controlled channel
and can be used
to monitor stations you do not have a crystal for. Once you have
tuned in the station you wish to monitor, you can also operate your scanner in
the automatic mode once you have selected a station. Press the AutolManual
Switch (F) in to the automatic position and the PRO-9 will scan all 8 channels;
the seven crystal controlled and one tuned channel.
PRIORITY OPERATION:
Priority is an optionally selected mode of operation.
In most areas there is usually one channel which you will want to monitor
consistently. The priority function allows you to do this while still enabling you to
scan
the other channels on the monitor.
When the Priority Switch (E) is depressed the scanner will operate as usual in
scanning across channels 1 th ru 8
looking for an active channel. However, if it
should stop on any channel other than the priority channel for more than two
seconds, it wi 11 automatically scan back and check the priority channel.
The priority channel number is selected with priority switch B.
This priority channel sampling occurs virtually instantaneously and if the
priority channel is not active, the scanner returns to the channel being monitored
previously. This scan-back takes only six-hundredths of a second, so there is
scarcely a noticeable interruption to the signal you were monitoring.
If the priority channel is active the scanner will continue to monitor it until it
clears, and
then return to the channel previously being monitored.
A unique feature of your PRO-9 monitor receiver is that it provides not only
manual crvstal-controlled channel selection and automatic scanner operation, but
continuous tuning as weil.

Crystal Installation:
Due to the numerous frequencies or channels available, crvstals are not installed
by the factory, but by the seller or owner of the unit. Because of the accuracy
required it is recommended that the crvstals be ordered from Radio Shack
Stores,
specifying the model number of the set and the frequency you wish to
receive.
Allow 3 to 4weeks delivery. Order crvstals under Catalog No. 20-002.
Crvstal soekets are provided inside the front end of the unit. Unscrew the plate at
the Rear of the cabinet to insert the crvstals, To receive a signaion a specific
channel, insert proper crvstal into the proper soeket (Channel 1= socket marked 1
on the circuit board, and sa on). Refer to Fig. 3.
BACK (
PANEL
XTAL
o
XTAL LOCATION
CHANNEL NO.
Frequency Coverage: (IMPORTANT)
For maximum sensitivity, the channel frequencies specified should be within
plus or minus 4 MHz of 153 MHz. However, for channel frequencies outside of
this range, the unit will stilloperate, but with some loss in sensitivity. This 8 MHz
range can be moved up, or down, in the band, in which case the RF section
(Front End) of the receiver would have to be realigned.
Special
Instructions for 162.55 MHz Weather Channel:
The 162.55 MHz weather channel broadcasts a continuous 24 hour carrier
signa!. When set for automatic scan, your PRO-9 will stop and remain on weather
channel until manually "stepped" to another frequency. To prevent automatic
locking on the weather channel, deactivate the channel by releasing the push
button control for the channel to the "out" position. then, when you want the
weather report, reactivate the channel with the push button control.
Note: Insome areas more than one transmitter is operating and because they are
so close an
alternate frequency may be used for weather.
The alternate frequency is 162.400 MHz.
Check with your local Weather Bureau or local FCC office.
FIG-3
Crystals should be ordered from Radio Shack stating channel frequency and
model number.
Radio Shack is not responsible for poor operation wh en crvstals of another
manufacturer are used.
- 6-

VHF
ANTEN NA
JACK
Model PRO-9 Block Diagram
Jl
e;:" SWITCHING VHF FRONT ENO SWITCHING IF AMP.
XTAL IF AMP.
v:::7 CIRCUIT -
148-174 MHz
C----
CIRCUIT
f----
10.7 MHz -
f----
10.7 MHz 1---'>--
DETECTOR
I---
~
01,2,3
-
014,15
016,42
FILTER
IC1,2
I
,,/
~
SoUELCH @
CONTROL
TRANSISTOR NOISE AMP. SoUELCH SOUELCH
>/
AUDIO AMP.
SWITCHING -DETECTOR
'---
DC AMP. f---- AF AMP.
~
04 - 9 017,18 019,IC3
021,22
023, 24, 25
VOLUME
CONTROL
I
l-.@)
RF AMP. 1 OUT OF SCANNING
DELAY AMP
MIXER 8 DECORDER
-
148-174 MHz - -
,----
027 - 34 -GENERATOR -
010,11
012 IC5, 6, 7 IC4
IC3,4
I
I
XTAL LOCAL SKIPPER POLARITY
f------o
I
OSCILLATOR
c-
013
IC3,4
PROTECTOR
PRIORITY
REGULATED DC RIPPLE FILTER
~~>--
POWER SUPPLY
----0
-CONTROL TO ALL EXCEPT - VOLTAGE REG.
IC3,4, 036-39
AUDIO CIRCUIT
Q41,42
RECTIFIER
-7 -
J2
TAPE OUTPUT
JACK
SPEAKER
J3
PHONE
JACK
J4
12-15 VDC JACK
NEGATIVE GND
ONLY
117V, 60Hz

Model PRO-9 Schematic Diagram
SW 1-8 PLI-8(sOmA 14V) @
1APE OUTPUT
1J 2
SW 1-8: CHANNEL SELECTO
SW9 PRIORITY CHANNEL SELECTOR
SWIO PRIORITY ON/OFF SWITCH
SWII MANUAL SELECTOR
SWIZ AUTO/MANUAL SI/',"TCH
T
025 250235(01
026 258435(01
DI9 HV-80
RSZ 10K
REMARKS
FUNCTIONS:
JI ANTENNA JACK
J2 TAPE OUTPUT
J3 PHONE JACK
J4 OC POWER CONNECTOR
VR I SQUELCH CON TROL
VR 2:VOLUME CONTROL
W/POWER SW.(SW-13)
035 37 HV-80
038 02ZIOA
02123 25C373 Q24 2SC735(Y)
RESISTANCE VALUES IN OHM. K=IOOO
CAPACITANCE VALUES IN MF. P= MMF
ALL VALUES AND RATI NG ARE SUBJCT TO CHANGE FOR
I
MPROVEMENT WITHOUT NoTleE.
""
Q404125C789
I
RI24 RI26 RI 27'k., 039~43 ISI885 -~ OCJACK
;JJ)- ~ ","''';,>':+ I~ ~'~----K-------rW' <,
1- )0 ~ ~04' ~/ lSW "~ D43 T -6 o:~_q J4 ,Z-15VOe
ij~ NEGATIVE
~~b- ~ ~ ~~ ~ ID39 ~/O: ~;;~IIQ"~ GNO ONLY
~ ê~~~LS- il :"
~ 0p",_ ~ 117V-60Hz
r-, <8 ~ ~ D4D
§ D38: ITr-- Cl) 0"> 042
co I I~ e ~
RI(3.3M)
TP-2
IC - 3 N 7404A
Q20 2SC 373
018 IN - 60
/'C -
25C373
25C735
25C373
N 74ü4A
N 7400A
N 7473A
N740BA
RI23 471 Y2)
sw 10
I OUT OF 8 DECORDER, SKIPPER B PRIORITY
Q 27"'35
036
Q37~39
IC 3
IC 4
IC
5.6
IC 7
Cl401
8:\J
SW9 ,
07-13 1573 013 2SC394(Y)~8
,.1012 13 X TAL
I 011 ;. f-o-iL1~
08~~ ~ I-<>
07 r" 1--0
I-<>
I---
-8 -