RadioShack Pro 91 Handheld Trunking Scanner Owners Manual

Owner’s ManualCat. No. 20-521
PRO-91 150-Channel
Handheld Trunking Scanner
Please read before using this equipment. 

2
FEATURES
Your RadioShack PRO-91 150-Channel Handheld
Trunking Scanner is one of a new generation of scan-
ners designed to track Motorola Type I and Type II
(such as Smartnet and Privacy Plus) and hybrid ana-
log trunking systems, which are extensively used in
many 800 MHz communication systems. 
Trunking communications systems let a large group of
2-way radio users (or even different groups of 2-way ra-
dio users) efficiently use a large range of frequencies.
Instead of selecting a specific frequency...

3
Five Channel-Storage Banks — you can store up to
30 channels in each of 5 different banks to group chan-
nels so you can more easily identify calls.
Five Scan Lists — you can store up to 50 trunking IDs
in each trunk tracking bank.
Two-Second Scan Delay — delays scanning for about
2 seconds before moving to another channel, so you
can hear more replies that are made on the same chan-
nel.
Lock-Out Function — lets you set your scanner to skip
over specified channels or frequencies when scanning
or...

4
Flexible Antenna with BNC Connector — provides
excellent reception and is designed to help prevent an-
tenna breakage. Or, you can connect an external an-
tenna.
Monitor Memories — let you temporarily store up to 5
frequencies or IDs.
Memory Backup — keeps the frequencies stored in
memory for an extended time if the PRO-91 loses pow-
er.
Three Power Options — let you power the scanner
using internal batteries, external AC power using an
optional AC adapter/charger, or DC power using an op-
tional DC...

5 We recommend you record your scanner’s serial num-
ber here. The number is on the back panel.
Serial Number: ___________________________ 
FCC NOTICE
Your scanner might cause radio or TV interference
even when it is operating properly. To determine wheth-
er your scanner is causing the interference, turn off
your scanner. If the interference goes away, your scan-
ner is causing it. Try the following methods to eliminate
the interference:
 Move your scanner away from the receiver 
 Connect your scanner...

6
quires that scanners be manufactured in such a way as
to not be easily modifiable to pick up those transmis-
sions. Do not open your scanners case to make any
modifications that could allow it to pick up transmis-
sions that it is not legal to listen to. Doing so could sub-
ject you to legal penalties.
We encourage responsible, legal scanner use.
CONTENTS
Preparation ............................................................  10
Power Sources .................................................  10...

7
Special Features  ....................................................  34
Delay ................................................................  34
Turning Channel-Storage Banks On and Off  ...  34
Locking Out Channels  ......................................  35
Priority ..............................................................  35
Using the Keylock  ............................................  37
Using the Display Backlight ..............................  37
Changing Search Speeds...

8Frequency Conversion  63
Troubleshooting   64
Resetting the Scanner  .....................................  67
Care and Maintenance  ..........................................  68
Specifications ........................................................  69 

9
PREPARATION
POWER SOURCES
You can power your scanner from any of three sources: 
 Internal batteries (not supplied) 
 Standard AC power (using an optional AC adapter) 
 Vehicle battery power (using an optional DC
adapter) 
Using Internal Batteries
You can power your scanner using four AA batteries.
For the longest operation and best performance, we
recommend alkaline batteries (such as Cat. No. 23-
552).
You can also use four rechargeable nickel-cadmium
batteries (Cat. No. 23-125). Before you use...

10
3. If you are installing alkaline batteries, use a
pointed object such as a pencil to set 
ALKALINE
 JACK   NI-CD 
inside the compartment to
ALKALINE. Or, if you are installing nickel-cadmium
batteries, set it to 
NI-CD.
Warning:
 Never set 
ALKALINE  JACK  NI-CD
to NI-CD if you are installing non-rechargeable bat-
teries. Non-rechargeable batteries can get hot or
explode if you try to recharge them.
4. Install two batteries in the compartment and two in
the cover as indicated by the polarity symbols...