RadioShack Pro 90 TrunkTracker Scanner Owners Manual

11 When you finish using the DC cigarette-lighter power ca-
ble, disconnect it from the cigarette-lighter socket, then
disconnect it from your scanner.
Note: If the scanner does not operate properly when you
connect  a  DC cigarette-lighter power cable, unplug the
power cable from the cigarette-lighter socket and clean
the socket to remove ashes and other debris.
CONNECTING THE ANTENNA
Follow these steps to attach the supplied flexible anten-
na to the connector on the top of your scanner.
1. Align the...

12
Connecting an Optional Antenna
The scanner’s antenna jack makes it easy to use the
scanner with a variety of antennas. Instead of the sup-
plied antenna, you can attach a different one, such as an
external mobile antenna or outdoor base station anten-
na. Your local RadioShack store sells a variety of anten-
nas.
Always use 50-ohm coaxial cable, such as RG-58 or
RG-8, to connect an outdoor antenna. For lengths over
50 feet, use RG-8 low-loss dielectric coaxial cable. If
your antenna’s cable does not...

13
CONNECTING AN EARPHONE/
HEADPHONES
For private listening, you can plug an earphone or head-
phones with a 1/8-inch mini-plug (such as Cat. No. 33-
175 or 20-210) into the   jack on top of your scanner.
This automatically disconnects the internal speaker.
Listening Safely
To protect your hearing, follow these guidelines when you
use an earphone or headphones.
• Do not listen at extremely high volume levels.
Extended high-volume listening can lead to perma-
nent hearing loss. 
• Set the volume to the...

14
CONNECTING AN EXTENSION 
SPEAKER
In a noisy area, an extension speaker (such as Cat. No.
21-549), positioned in the right place, might provide
more comfortable listening. Plug the speaker cable’s 
1/8-
inch mini-plug into your scanner’s   jack.
ATTACHING THE BELT CLIP 
You can attach the supplied belt clip to make your scan-
ner easier to carry when you are on the go. Use a Phil-
lips screwdriver and the two supplied screws to attach
the belt clip to the scanner. Then slide the belt clip over
your...

15
UNDERSTANDING YOUR SCANNER
Once you understand a few simple terms we use in this
manual and familiarize yourself with your scanner’s
features, you can put the scanner to work for you. You
simply find the communications you want to receive,
then set the scanner to scan them.
A frequency
 is the tuning location of a station (ex-
pressed in kHz or MHz). To find active frequencies, you
can use the search
 function. 
You can also search the service-search banks, which
are preset groups of frequencies...

16
SCAN — scans through the stored channels. 
MANUAL — stops scanning and lets you directly enter a
channel number or frequency. 
TRUNK — switches between conventional and trunk
tracking modes.
SVC (service) — selects a service bank.
SPEED/PRI (speed/priority) — turns on and off the Hyper-
search mode; sets and turns on and off the priority fea-
ture.
LOCK/  — locks the keypad to prevent accidental pro-
gram changes. Also turns on the display light for 15 sec-
onds.
Number Keys — each key has a...

17
A LOOK AT THE DISPLAY
The display has indicators that show the scanner’s cur-
rent operating status. A good look at the display will help
you understand how your scanner operates.
BANK — appears with numbers (1–10). Numbers with a
bar under them show which channel-storage banks are
turned on for scanning.
TRUNK — appears when the scanner is in the trunk
tracking mode.
 (channel activity indicators) — each represents a re-
ceived trunking frequency or a data frequency in the
trunk tracking mode (see...

18
SRCH — lights steadily during a limit search and ID
search, and blinks while HyperSearch is active and
when you monitor IDs (see “Monitoring IDs” on
Page 39).
PRI — appears when the priority feature is turned on.
HOLD — appears when you manually select a channel
or when the scanner is in the hold mode during a search
or service bank scan or during a limit search.
DLY — appears when you program a delay.
L/O — appears when you manually select a channel or
frequency you locked out.
 — appears when you...

19
UNDERSTANDING BANKS
Channel Storage Banks
To make it easier to identify and select the channels you
want to listen to, channels are divided into 10 banks of
30 channels each. Use each channel-storage bank to
group frequencies, such as the police department, fire
department, ambulance services, or aircraft (see “Guide
to the Action Bands” on Page 52). For example, the po-
lice department might use four frequencies, one for each
side of town. You could program the police frequencies
starting with...

20
OPERATION 
TURNING ON THE SCANNER
AND SETTING SQUELCH
Note:
 Make sure the scanners antenna is connected
before you turn it on.
1. Turn 
SQUELCH fully clockwise.
2. Turn 
VOLUME/OFF clockwise until it clicks and you
hear a hissing sound.
3. Press 
MANUAL and turn SQUELCH counterclockwise,
then leave it set to a point just after the hissing
sound stops.
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