RadioShack Pro 91 Handheld Trunking Scanner Owners Manual

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 (trunking channel activity bars) — each represents a
received trunking frequency or a data frequency while
trunk tracking (see “Channel Activity Bars” on Page 47).
-1- — appears when the weather service band is se-
lected.
-2- — appears when the amateur radio service band
is selected.
-3- — appears when the marine service band is se-
lected.
-4- — appears when the air service band is selected.
-5- — appears when the police service band is select-
ed.
— appears when a priority channel is selected.
BATT. Lo — blinks when the scanner’s battery is low.
 — appears when the data skip function is active.
SCAN — appears when you scan channels.
LIST— appears with numbers (1–5) during trunk
tracking. Numbers with a bar under them show which
ID scan list banks are turned on for scanning.
SVC— appears during a service search.
SEARCH — appears during a limit search and ID
search, and blinks when you monitor IDs (see “Monitor-
ing IDs” on Page 46).
PRI — appears when the priority feature is turned on.
HOLD — appears when you manually select a channel
or when the scanner is holding during a search.
DLY — appears when you program a delay.
L/O — appears when you manually select a channel or
frequency you locked out.
K/L (keylock) — appears when you lock the keypad.
Error — appears when you make an entry error.
P
DATA 
						

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MON— appears during search modes or when you
select a monitor memory. The number to the right of
this indicator shows the current monitor memory num-
ber.
MAN — appears when you press MAN.
PGM — appears while you store a frequency into a
channel, while you enter a frequency range during a
limit search, or when you program trunking frequen-
cies, fleet maps, or ID memories while trunk tracking.
HYPER— appears while Hyperscan or Hypersearch
is active during a direct or limit search.
t and s — appears during a limit, direct, or service
search, indicating the search direction.
 — appears when the battery save function is active
(during conventional scanning only).
UNDERSTANDING BANKS
Service Banks
The scanner is preprogrammed with all the frequencies
allocated to the weather, ham, marine, aircraft, and po-
lice (fire/emergency) services. This is handy for quickly
finding active frequencies instead of doing a limit
search (see “Service Bank Search” on Page 28).
Channel Storage Banks
To make it easier to identify and select the channels
you want to listen to, channels are divided into 5 banks
of 30 channels each. Use each channel-storage bank
to group frequencies, such as those for the police de-
partment, fire department, ambulance services, or air-
craft (see “Guide to the Action Bands” on Page 58).
For example, the police department might use four fre-
quencies, one for each side of town. You could pro-
gram the police frequencies starting with Channel 1
(the first channel in bank 1), and program the fire de-
partment frequencies starting with Channel 31 (the first
channel in bank 2).
S 
						

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Monitor Memories
The scanner also has 5 temporary memory locations
called monitor memories. You can use these monitor
memories to temporarily store frequencies while you
decide whether to store them into a channel. This is
handy for quickly storing an active frequency when you
search through an entire band (see “Searching For and
Temporarily Storing Active Frequencies” on Page 26).
While you are searching frequencies, the 5 numbers at
the top of the display indicate the 5 monitor memories.
MON appears and the number beside it that flashes in-
dicates the currently active monitor memory. 
						

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OPERATION 
TURNING ON THE SCANNER
AND SETTING SQUELCH
Note:
 Make sure the scanner’s antenna is connected
before you turn it on.
1. Turn 
SQUELCH fully counterclockwise.
2. Turn 
VOLUME/OFF clockwise until it clicks and you
hear a hissing sound.
3. Press 
MAN (manual) to stop the scanner from
scanning, turn 
SQUELCH clockwise, then leave it
set to a point just after the hissing sound stops. 
						

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STORING KNOWN FREQUENCIES 
INTO CHANNELS
Good references for active frequencies are Ra-
dioShacks “Beyond Police Call,” “Aeronautical Fre-
quency Directory,” and “Maritime Frequency Directory.”
We update these directories every year, so be sure to
get a current copy.
Follow these steps to store frequencies into channels.
1. Press 
MAN, enter the channel number where you
want to store a frequency, then press 
PROG. The
channel number appears. 
2. Use the number keys and 
 to enter the frequency
(including the decimal point) you want to store.
3. Press 
E to store the frequency into the channel.
Notes:
 If you entered an invalid frequency in Step 2,
Error appears and the scanner beeps three
times. Simply enter the frequency again.
1 
						

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 Your scanner automatically rounds the entered
frequency to the nearest valid frequency. For
example, if you enter a frequency of 151.473,
your scanner accepts it as 151.475.
 Press 
DELAY if you want the scanner to pause 2
seconds after a transmission ends before it pro-
ceeds to the next channel (see “Delay” on
Page 33). The scanner also stores this setting
in the channel.
4. If you want to program the next channel in
sequence, press 
PROG and repeat Steps 2 and 3. 
SEARCHING FOR AND 
TEMPORARILY STORING ACTIVE 
FREQUENCIES
If you do not have a reference to frequencies in your
area, use a limit, direct, or service search to find a
transmission. Also see “Guide to the Action Bands” on
Page 58.
Notes: 
While doing a limit, direct, or service bank
search, you can press:

DELAY if you want the scanner to pause 2 seconds
after a transmission ends before it proceeds to the
next frequency (see “Delay” on Page 33).
  if you want the scanner to skip data signals
(such as fax or modem signals) and search only
for audio (voice) signals (see “Skipping Data Sig-
nals” on Page 38).
Limit Search
A limit search lets you search within a specific range
of frequencies. 
-L- appears during a limit search.
1. Press 
PROG, then LIMIT.Lo and 29.000 MHz
appear.
DATA 
						

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2. Enter the frequency that is the lower limit of the
range you want to search (including the decimal
point), then press 
E.
3. Press
 LIMIT.Hi and 956.000 MHz appear.
4. Enter the frequency that is the upper limit of the
range you want to search (including the decimal
point), then press 
Eagain.
5. Press t to search from the upper to the lower limit,
or s to search from the lower to the upper limit.
6. When the scanner stops
on a transmission,
quickly press either:

HOLD to stop search-
ing so you can listen
to the transmission.
HOLD appears.

MON/CLEAR to store
the displayed fre-
quency into the cur-
rent monitor memory.
To release hold and continue searching, press
HOLD or hold down t or s for at least 1 second. Or,
if you did not press 
HOLD, simply press t or s to
continue searching. 
Direct Search 
Direct search lets you search up or down from the cur-
rently displayed frequency.
1. Press 
MAN.
2. Use the number keys to enter the frequency you
want to start the search from. Press 
 to enter a
decimal point. 
						

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Notes:
 If you want to start the search from a frequency
already stored in one of your scanner’s chan-
nels, press 
MAN or PROG, use the number keys
to enter the channel number, then press 
MAN or
PROG again.
 If you enter an invalid frequency, the scanner
displays 
Error. Simply repeat this step.
3. Press t to search downward or s to search upward
from the selected frequency. 
-d-,SEARCH, and t
or s appear.
4. When the scanner stops on a transmission,
quickly press either:

HOLD to stop searching so you can listen to the
transmission. 
HOLD appears.

MON/CLEAR to store the displayed frequency
into the current monitor memory.
To release hold and continue searching, press
HOLD or hold down t or s for at least 1 second. Or,
if you did not press 
HOLD, simply press t or s to
continue searching. 
Note: To step through the frequencies while 
HOLD
is displayed, press t or s.
Service Bank Search
You can search for weather, ham, marine, aircraft, or
police (fire/emergency) transmissions even if you do
not know the specific frequencies being used in your
area. The scanner is preprogrammed with all the fre-
quencies allocated to these services. To use this fea-
ture, press 
SVC.SVC appears and the scanner
searches through the weather service band. To select
a different service bank, press the desired service bank
key (
WX1,HAM2,MRN3,AIR4, or POL5). The corre-
sponding service band number (
-1-,-2-,-3-,-4-,
or 
-5-) appears, and the scanner starts searching the
band. 
						

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When the scanner stops on a transmission, quickly
press either:

HOLD to stop searching so you can listen to the
transmission. 
HOLD appears.

MON/CLEAR to store the displayed frequency into
the current monitor memory.
To release hold and continue searching, press
HOLD or hold down t or s for at least 1 second. Or,
if you did not press 
HOLD, simply press t or s to
continue searching. 
Note: 
Because there are many different frequencies al-
located to fire and police departments, it takes several
minutes to search all these frequencies.
Search Skip Memory
You can skip up to 20 specified frequencies during a
limit or direct search and up to 20 specified frequencies
during a service bank search. This lets you avoid un-
wanted frequencies or ones you have already stored in
a channel.
To skip a frequency, press
S/S when the scanner
stops on the frequency dur-
ing a limit, direct, or service
search. The scanner stores
the frequency in memory
and automatically re-
sumes the search.
To clear a single frequency from skip memory so the
scanner once again stops on it during a limit, direct, or
service bank search:
1. Press 
HOLD to hold the search.
2. Press t or s to select the frequency. 
L/O ap-pears.
3. Press 
S/S.L/O disappears.
To clear all the skip frequencies at once while search-
ing, press 
HOLD, then hold down S/S until the scanner
beeps twice (about 3 seconds). 
						

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Notes:
 If you marked all frequencies to be skipped within
the search range, the scanner beeps 3 times and
does not search.
 If you program more than 20 frequencies to skip,
each new frequency replaces one you already
stored, starting from the first frequency you stored.
 Press t or s to select a skipped frequency while
HOLD appears. L/O appears when you select a
skipped frequency.
LISTENING TO THE MONITOR 
MEMORIES
You can listen to the fre-
quency you stored in any
one of the five monitor
memories by pressing
MAN,MON/CLEAR, then
the number of the moni-
tor memory you want to
listen to (1–
5).
Note: To listen to the
monitor memories, the
priority channel feature
must be turned off (see
“Priority” on Page 34).
MOVING A FREQUENCY FROM A 
MONITOR MEMORY TO A 
CHANNEL
1. Press MAN.MAN
appears.
2. Enter the number of
the channel where
you want to store
the frequency in a
monitor memory,
then press 
PROG.
PGM appears.