RadioShack Pro 94 Handheld Scanner Owners Manual

41
TRUNKING OPERATION
The PRO-94 scanner tracks transmissions that use the
Motorola Type I, Type II, hybrid, and, Ericsson EDACS
analog trunking systems. Remember these important
points when tracking transmissions:
• Your scanner cannot scan trunked system and
conventional frequencies at the same time.
• The frequencies for many of the 800 MHz, 900
MHz, and EDACS public safety systems are listed
in the separate “National Public Safety Trunked
System Frequency Guide” included with your
PRO-94.
TYPES OF...

42
The police department, fire department, utilities group,
and city administration could each be a separate fleet.
The police might decide to further divide its fleet into
subfleets, such as dispatch, tactical operations, detec-
tives, north, south, east, and west side patrols, and su-
pervisors. All the available police radios would then be
assigned to one of the police subfleets, letting the po-
lice centralize their communications and control the
type of users on a single system. Determining the...

43
SETTING SQUELCH FOR THE
TRUNKING MODE
Your scanner’s squelch setting is automatically adjust-
ed during trunking, which means it is not necessary to
manually adjust squelch while scanning trunked trans-
missions. However, the squelch setting can affect how
fast your scanner acquires the data channel, and, in
some instances, can prevent your scanner from acquir-
ing the data channel at all.
We recommend you set 
SQUELCH fully clockwise be-
fore selecting a trunked bank.
Note:
 Change this setting as...

44
• You can designate any of your scanner’s banks as
either a trunk scanning bank or conventional scan-
ning bank, but you cannot mix the two modes in
one bank. 
• The PRO-94 can scan multiple trunking systems. if
a system is inactive for 5 seconds, the PRO-94
starts scanning the next selected trunk bank. 
Follow these steps to select, program, and store trunk-
ed frequencies.
1. Press 
PROG then TRUNK. TRUNK appears and
one or more bank numbers flash.
2. Press the number key (1–10) of the desired...

45
Notes:
 
• If you enter an invalid frequency (outside the
selected range), the scanner beeps, the channel
number flashes and 
Error appears. If this
happens, press 
MON/CLR (•) to clear the fre-
quency, then repeat the entry.
• For EDACS systems, you must enter the fre-
quencies in logical channel number (LCN) order.
• If you try to enter a duplicate frequency in a
bank, the scanner beeps and the channel which
was previously stored appears.
• It is very important that you enter all the listed...

46
SCANNING A TRUNKED BANK
Once you have stored frequencies for a trunked sys-
tem in one or more of the 20 available banks, and while
the PRO-94 scans conventional (non-trunked) frequen-
cies, follow these steps to switch to trunk scanning. 
1. Press 
TRUNK. The numbers of the banks which
have stored frequencies flash and 
BANK and
TRUNK appear.
2. Press V
. Only the bank numbers you programmed
as Motorola (
M) systems flash. If you want to scan
an EDACS (
ME) system, press V
 again. Only the
bank...

47
covering the ID owner of each signal is half the fun of
trunk scanning!
Turning a Trunked Bank On or Off
Press DATA (ALT) during trunk scanning. The selected
trunked banks appear. Press the bank number (
0–9), to
turn the desired bank on or off.
Skipping a Trunked Bank
You can skip to the next trunked bank during scanning
by holding down 
SRC (LIMIT) for about 3 seconds.
Turning the Status Bit Ignore
(S-bit) On or Off
You can set how your scanner works with status bits
(also called S-bits), letting...

48
Follow these steps to turn status bit ignore on or off.
1. Hold down 
SCAN until the current status bit ignore
setting (
ON or OFF) appears.
2. Press s
 to select 
ON or t
 to select OFF, then
press 
E (SVC).
Identifying a Trunked Frequency
While ID scanning (looking for IDs within a trunked sys-
tem) or performing an ID search, press W
 to see the
current trunked frequency. (The frequency flashes
twice.) Then hold down W
 until a confirmation tone
sounds and the ID and the frequency alternately ap-...

49
Using HOLD to Monitor an
Active Talk Group ID
Follow these steps to stop scanning and keep the scan-
ner tuned to a desired ID. 
1. Press 
HOLD (A/B). HOLD appears and the scanner
stays on the current ID.
2. If you want to listen to (and hold) a different ID, use
the number keys to enter that ID.
3. Press 
HOLD (A/B) again. HOLD flashes, then the
scanner monitors the ID.
4. Press 
SRC to resume searching for a data channel
(trunk scanning).
Temporarily Storing a Talk Group ID into 
the Monitor ID...

50
Locking Out Talk Group IDs
Many municipal and commercial services use trunk
systems to transmit signals from such devices as water
meter transmitters, door alarms, and traffic signals.
Some signals are encrypted, as well, and most are not
voice signals. Since all these are assigned IDs just like
other users, you may want to lock out reception of
these ID signals. You can lock out up to 100 IDs at one
time.
Note: 
If you lock out an ID while searching, it is also
locked out of the scan list(s). See...