RadioShack Pro 91 Handheld Trunking Scanner Owners Manual

11
If BATT.Loflashes and the scanner beeps every 15
seconds, replace (standard/alkaline) or recharge (re-
chargeable nickel-cadmium) the batteries.
Caution: Always dispose of old batteries promptly and
properly. Do not bury or burn them.
Charging Nickel-Cadmium Batteries
The scanner has a built-in circuit that lets you recharge
nickel-cadmium batteries while they are in the scanner.
To charge the batteries, set 
ALKALINE  JACK  NI-
CD
 to NI-CD, install the nickel-cadmium batteries in the
scanner, and...

12
Important: At the end of a rechargeable battery’s use-
ful life, it must be recycled or disposed of properly.
Contact your local, county, or state hazardous waste
management authorities for information on recycling or
disposal programs in your area. Some options that
might be available are: municipal curb-side collection,
drop-off boxes at retailers such as your local Ra-
dioShack store, recycling collection centers, and mail-
back programs.
Using AC Power
You can power the scanner from a standard AC...

13
1. Turn VOLUME/OFF counterclockwise until it clicks
to make sure the power is turned off.
2. Plug the adapter’s 3.4 mm outside diameter/1.3
mm inside diameter barrel plug into your scanner’s
POWER jack. 
3. Plug the other end of the adapter into a standard
AC outlet.
If rechargeable batteries are installed and 
ALKALINE 
JACK  NI-CD
 is set to NI-CD, the adapter powers the
scanner and recharges the batteries at the same time.
Using Vehicle Battery Power
You can power the scanner from your vehicle’s...

14
1. Turn VOLUME/OFF counterclockwise until it clicks
to make sure the power is turned off.
2. Set the adapter’s voltage switch to 9V.
3. Connect the 3.4 mm outer diameter/1.3 mm inner
diameter tip to the adapter cord, matching TIP to –.
4. Plug the adapter’s barrel plug into your scanner’s
POWER jack. 
5. Plug the other end of the adapter into your vehi-
cle’s cigarette-lighter socket.
If you have installed rechargeable batteries and
set 
ALKALINE  JACK  NI-CD to NI-CD, the
adapter powers the scanner...

15
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 slots around the antenna’s connector with
the tabs on the scanner’s BNC connector.
2. Slide the antenna’s connector down over the scan-
ner’s connector and rotate the antenna connector’s
outer ring clockwise until it locks into place.
Connecting an Optional Antenna
The scanner’s BNC connector makes it easy to connect
a variety of optional antennas (such as an...

16
CONNECTING AN EARPHONE/
HEADPHONES
For private listening, you can plug an earphone or
mono headphones (such as Cat. No. 33-178 or 20-
210) into the   jack on top of your scanner. This auto-
matically 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 per-
manent hearing loss. 
 Set the volume to the lowest setting before...

17
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
scanner easier to use when you are on the go. Use a
Phillips screwdriver and the supplied screws to attach
the belt clip to the scanner. Then slide the clip over your
belt or waistband. 

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ABOUT 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 determine the type of communications you want
to receive, then set the scanner to scan those commu-
nications.
Afrequency
 is the tuning location of a station (ex-
pressed in kHz or MHz). To find active frequencies,
you use the search
 function. 
Besides searching within a frequency range you deter-
mine, you can also...

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A LOOK AT THE KEYPAD
Your scanner’s keys might seem confusing at first, but
this information should help you understand each key’s
function.
HOLD— holds the frequency search; holds on the cur-
rent ID in the trunk tracking mode.
SCAN — scans through the stored channels. 
MAN (manual)— stops scanning and lets you directly
enter a channel number or frequency.
PROG (program) — stores frequencies into channels;
programs the trunking frequency, fleet map, and ID
memories.
TRUNK— switches between...

20
DELAY— programs a 2-second delay for the selected
channel, a limit search, or each service scan; programs
a 5-second delay while trunk tracking.
t — searches down through a selected frequency
range during a frequency search; selects options dur-
ing program operation; changes the ID location number
while trunk tracking.
s — searches up through a selected frequency range
during a frequency search; selects options during pro-
gram operation; changes the ID location number while
trunk tracking.
Number...