RadioShack Pro 91 Handheld Trunking Scanner Owners Manual

41
SETTING SQUELCH FOR THE 
TRUNK TRACKING MODE
Your scanner’s squelch setting is automatically adjust-
ed during trunk tracking, which means it is not neces-
sary to manually adjust squelch while tracking trunked
transmissions. However, the squelch setting can affect
how fast your scanner acquires the data channel, and,
in some instances, can prevent your scanner from ac-
quiring the data channel at all.
We recommend you set 
SQUELCH to this position before
selecting a trunked bank.
Note:
 You can...

42
Before scanning a trunked system’s transmissions, you
must store the trunked system’s frequencies in one of
the banks in your scanner by following these steps.
1. Press 
PROG then TRUNK.TRUNK appears and
one or more bank numbers flash.
2. Select the bank you want to store the trunked sys-
tem’s frequencies in by pressing a number key.
The scanner automatically selects the first channel
in the bank when you select the bank.
3. Use the number keys to enter one of the trunked
system’s frequencies, then...

43
6. Press SRC to begin
searching for the trunk’s
data channel (the channel
that controls the trunk).
SEARCH flashes as the
scanner searches for the
data channel.
While the scanner looks through the frequencies,
you see them on the display. When the scanner
finds the data channel, it begins trunk tracking.
SCANNING A TRUNKED BANK
You can scan one trunked bank at a time. Once you
have stored frequencies for a trunked system in one or
more of the 5 available banks and you are scanning
conventional...

44
Hint: While scanning, you will not know exactly who
the IDs are assigned to until you listen awhile or until
you locate ID lists in frequency guides or on internet
sites such as 
www.trunkscanner.com. Within a few
minutes, you can usually figure out if what you are lis-
tening to is a police, fire, or emergency medical 2-way
radio user. Other IDs might take some time, but deter-
mining who each ID represents is half the fun of trunk
tracking!
Monitoring an Active ID
When the scanner stops on a...

45
Locking Out IDs
As with conventional scanning, it is possible to lock out
unwanted traffic. This is particularly important in trunk-
ed systems because signals you cannot listen to (such
as water meters, door alarms, traffic signals, and en-
crypted signals) are assigned IDs just like other users.
You can have up to 100 IDs locked out at one time.
Note: 
If you lock out an ID while searching, it is also
locked out of the scan list(s). See “Scan Lists” on
Page 48.
To lock out an ID, press 
L-OUT when...

46
Using Trunk Tracking Scan Delay
Many trunked systems have a period of 2 or more sec-
onds between a query and a reply. You can program a
5-second delay to hold on an ID for 5 seconds to wait
for a reply. The scanner continues to monitor the fre-
quency for 5 seconds after the transmission stops be-
fore resuming scanning.
Press 
DELAY to turn trunk tracking scan delay on or off.
DLY appears when trunk tracking scan delay is set.
Note:
 If you consistently miss responses even with
trunk tracking scan...

47
CHANNEL ACTIVITY BARS
Your scanner has 20 channel activity indicators (bars)
which show the activity taking place on a trunked sys-
tem. You can see how many frequencies are being
used and generally monitor how much communication
traffic is occurring.
Each frequency you store in a trunking bank has a cor-
responding activity bar. However, since there are only
20 bars, but you can store up to 30 frequencies, some
bars might indicate more than one frequency if the
trunked system you are scanning has...

48
SCAN LISTS
When you program trunked frequencies into a bank
(see “Storing Trunked Frequencies” on Page 41), your
scanner sets up 5 scan lists into which you can store
your favorite IDs. Each list can contain up to 10 IDs, so
you can store a total of 50 IDs for each trunk tracking
bank (250 IDs if you use all banks as trunking banks!).
Scan lists help you organize trunking system users into
categories. For example, you might use List 1 for police
IDs, List 2 for fire department IDs, List 3 for...

49
Or, to enter a Type I ID:
a. Use the number keys to enter the block number
and fleet number, then press 
.
b. Enter the subfleet number, then press 
E.
Note: 
To clear a mistake while entering an ID,
press 
0then E, then start over at Step 1.
5. Repeatedly press 
PROGor s to select the next
scan list location you want to program. Then repeat
Step 4 to enter another ID.
Moving IDs to Scan Lists
1. Press MAN.MAN appears.
2. Select the ID scan list location where you want to
store the IDs. Then press...

50
SCANNING THE SCAN LISTS
Press SCAN to begin scanning the lists you have
stored. 
Note:
 If you have not stored any IDs, 
SCAN scrolls on
the display, but your scanner does not stop on an ac-
tive conversation.
To remove a scan list from active scanning, use the
number keys to enter the scan list’s number. The scan
list number turns off, and the IDs in that list are not
scanned. 
Note: 
One scan list must always be active. You cannot
remove all of the scan lists.
To restore a scan list to active...