RadioShack Pro 90 TrunkTracker Scanner Owners Manual

21
Notes:
• If you have not stored frequencies into any chan-
nels, the scanner does not scan.
• If the scanner picks up unwanted, partial, or very
weak transmissions, turn 
SQUELCH counterclockwise
to decrease the scanners sensitivity to these sig-
nals. If you want to listen to a weak or distant sta-
tion, turn 
SQUELCH clockwise.
•If 
SQUELCH is adjusted so you always hear a hissing
sound, the scanner does not scan properly.
STORING KNOWN FREQUENCIES 
INTO CHANNELS
Good references for active...

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3. Press E to store the frequency into the channel.
Notes:
• If you made a mistake in Step 2, 
Error appears
and the scanner beeps when you press 
E. Simply
start again from Step 2. 
• 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 on this channel after a transmission
ends before it proceeds to the next channel (see...

23
4. Use the number keys and • to enter the frequency
that is the upper limit of the range you want to
search.
5. Press 
LIM IT, then press SRCH. The scanner begins to
search from the lower limit to the upper limit.
6. When the scanner stops on a transmission, quickly
press either:
•E
 to store the displayed frequency into the chan-
nel. The scanner stores the frequency and con-
tinues searching.
• s or t to stop searching so you can listen to the
transmission. 
HOLD appears.
To release hold and...

24
Your scanner has the following preprogrammed service
banks.
• POLICE — contains 1,079 police frequencies.
• FIRE/EMG — contains 280 fire and emergency ser-
vice frequencies.
• AIR — contains 2,319 aircraft and air service fre-
quencies.
• MRN contains 65 marine frequencies.
• WX — contains 7 weather frequencies.
To select a service bank, press 
SVC. A service bank’s
name 
(POLICE, FIRE/EMG, AIR, MRN, or WX) and
one of the preset police frequencies appear. After a 2-
second delay, scanning begins. To...

25
SCANNING THE STORED CHANNELS
To begin scanning channels, press SCAN. The scanner
scans through all non-locked channels in the activated
banks. When the scanner finds a transmission, it stops
on it. When the transmission ends, the scanner resumes
scanning.
Note:
 To scan in the trunk tracking mode, see “Scanning
a Trunked Bank” on Page 36.
MANUALLY SELECTING A CHANNEL
You can continuously monitor a single channel without
scanning. This is useful if you hear an emergency broad-
cast on a channel and do...

26
SPECIAL FEATURES
DELAY
Many agencies use a two-way radio system that might
have a period of 2 or more seconds between a query
and a reply. To keep from missing a reply, you can pro-
gram a 2-second delay into any channel or frequency.
The scanner continues to monitor the frequency for 2
seconds after the transmission stops before resuming
scanning or searching.
To program a 2-second delay:
• If the scanner is scanning channel-storage banks
and stops on an active channel where you want to
store a...

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TURNING CHANNEL-STORAGE 
BANKS ON AND OFF
You can turn each channel-storage bank on and off.
When you turn off a bank, the scanner does not scan
any of the 30 channels in that bank.
While scanning, press the number key that corresponds
to the bank you want to turn on or off. If the bar under the
bank number is on, the bank is turned on and the scan-
ner scans all channels within that bank that are not
locked out. If the bar is off, the scanner does not scan
any of the channels within that bank....

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Note: You can still manually select locked-out channels.
To remove the lockout from a channel, manually select
the channel and hold down 
L/O until L/O disappears
from the display.
To unlock all channels in the banks that are turned on,
press 
MANUAL to stop scanning, then hold down L/O until
the scanner beeps twice.
Locking Out Frequencies
To lock out a frequency during a limit search or service
bank scan, press 
L/O when the scanner stops on the fre-
quency. The scanner locks out the frequency, then...

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The scanner automatically designates each banks first
channel as its priority channel. Follow these steps to se-
lect a different channel as the priority channel for a bank.
1. Press 
MANUAL.
2. Enter the channel number you want to select as the
priority channel, then press 
MANUAL again.
3. Hold down 
PRI until the scanner beeps twice. P
appears to the left of the channel number.
4. Repeat Steps 2–3 for the channel in each bank you
want to program as a priority channel.
To turn on the priority...

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USING THE KEYLOCK
Once you program your scanner, you can protect it from
accidental program changes by turning on the keylock
feature. When locked, the only controls that operate are
SCAN, MANUAL, LOCK/, VOLUME/OFF, and SQUELCH. 
Note: 
The keylock does not prevent the scanner from
scanning channels.
To turn on the keylock, hold down 
LOCK/ until 
appears. To turn it off, hold down 
LOCK/ until 
disappears.
USING THE DISPLAY BACKLIGHT
You can turn on the display backlight for easy viewing at
night....