PRO-94 1000-Channel Handheld Trunking Scanner
(200-0524) Trunking Operation Faxback Doc. # 57987
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 Trunking Systems
This trunking scanner monitors two basic types of systems - the Motorola
Type I/Type II or hybrid System, and the Ericsson EDACS System. Instead
of selecting a specific frequency to transmit on, a trunked system chooses
one of several frequencies in a 2-way radio user's talk group when that
user presses their PTT (push to talk) control. Thus, trunking systems, in
general, allocate a few frequencies among many different users. Motorola
Type I and Type II systems achieve the same thing in a slightly different
way. One important distinction between these systems is the amount of
data transmitted by each radio when the operator pushes the PTT control.
A Type I system, transmits the radio's ID and its current affiliation or
the trunk system to which it belongs. A Type II system only transmits the
radio's ID.
Why the difference? In Type I systems, each radio in the trunk group
individually transmits its own affiliation, while the trunk system
maintains a database that determines each radio's affiliation(s) in Type
II systems.
Another difference between the systems is that Type I systems are arranged
in a fleet-subfleet hierarchy. For example, it is possible for a city
using a Type I system to designate four fleets, each with eight subfleets.
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, detectives, north, south, east and west side patrols and
supervisors. All the available police radios would then be assigned to
one of the police subfleets, letting the police centralize their
communications and control the type of users on a single system.
Determining the exact fleet-subfleet hierarchy for a particular area is
referred to as fleet map programming.
The disadvantage of a Type I system is that the brief burst of data sent
when a user transmits must contain the radio's ID its fleet information,
and the subfleet information as well. This is three times the amount of
data a Type II system radio sends. Since the data capacity of Type I
systems is limited and the total amount of data increases with each user,
Type I systems usually accommodate fewer users than Type II systems.
Nevertheless, Type I systems are still in use.
There are also hybrid systems which are a combination of Type I and Type
II. Your scanner is preset to monitor Type II systems, but you can change
to Type I or a hybrid of Type I and Type II systems by selecting a
preprogrammed fleet map or creating a custom fleet map for your area (see
"Scanning Type I and Hybrid Trunked Systems" below).
Setting The Scanner To The Trunking Mode
Press TRUNK to switch between conventional scanning and trunking operation
Setting Squelch For The Trunking Mode
Your scanner's squelch setting is automatically adjusted during trunking,
which means it is not necessary to manually adjust squelch while scanning
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 acquiring the data channel at all.
We recommend you set SQUELCH fully clockwise before selecting a trunked
bank.
Note: Change this setting as needed for the best performance in your
area.
Storing Trunked Frequencies
Before you set up your scanner to track a trunked system, consider the
following:
The following frequency ranges are valid for the trunk systems
indicated.
Motorola Type I and Type II system:
935.0125-939.9875 MHz
851.0000-868.9875 MHz
406.0000-512.0000 MHz
137.0000-174.0000 MHz
Ericsson EDACS system:
900.0000-956.0000 MHz
806.0000-899.9875 MHz
(except cellular frequencies)
406.0000-512.0000 MHz
137.0000-174.0000 MHz
You can designate any of your scanner's banks as either a trunk scanning
bank or conventional scanning 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 trunked 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 target storage bank. Select
one of the trunk systems by repeatedly pressing \/ or /\ to select a
trunking system type, then press E (SVC). The scanner then
automatically selects the first channel in the selected bank.
Note: You can select from the following six systems:
You See Trunk System
E1 Motorola Type I, 800-MHz frequencies
Ed EDACS frequencies
E2 - 800 Motorola Type II, 800 MHz frequencies
E2 - 900 Motorola Type II, 900 MHz frequencies
E2 - Hi Motorola Type II, VHF frequencies
E2 - UHF Motorola Type II, UHF frequencies
3. Use the number keys to enter a valid frequency within the trunk
system, then press E (SVC). BANK and the bank number, the channel
number and E (EDACS) or M (Motorola) appears depending upon the trunk
system selected.
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 frequency, then repeat the entry.
For EDACS systems, you must enter the frequencies 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 frequencies
for the selected agency in Step 3. Otherwise, trunking will
not occur when you press SRC (see Step 6 below).
4. Press either PROG or /\ to select the next channel in the bank.
5. Repeat Steps 3 and 4 until you enter all desired frequencies in that
bank.
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.
As the scanner looks through the frequencies, you see them on the
display. When the scanner finds the controlling data channel, the
scanner begins trunking.
Scanning A Trunked Bank
Once you have stored frequencies for a trunked system in one or more of
the 20 available banks, and while the PRO-94 scans conventional (non
trunked) frequencies, 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.
BANK A 1 2 3 4 5 6 7 8 9 10
TRUNK --------------------
ME
2. Press /\. Only the bank numbers you programmed as Motorola (M)
systems flash. If you want to scan an EDACS (E) system, press /\
again. Only the bank numbers you programmed as EDACS system flash.
Press the number key of the trunked bank you want to scan, then press
SRC. The scanner searches for a data channel. When the scanner finds
it, the scanner begins trunking.
BANK A 2
TRUNK
M
1 CH 2992
SEARCH
3. To return to conventional scanning, press TRUNK.
Hint: While scanning, you may not know exactly to whom the talk group IDs
are assigned until you listen awhile. To locate talk group ID lists
for your local police, fire and other agencies, refer to frequency
guides available at your local RadioShack store or on internet sites
such as www.trunkscanner.com. You can also determine the type of
agency you are listening to after a short while, be it a police,
fire or emergency medical 2-way radio user. Once you have identified
the type of service, note the associated talk group ID of that unit
for future programming. See "Identifying a Trunked Frequency" below.
Determining the service associated with a talk group ID might take
awhile, but discovering 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 you control how the scanner interprets and displays talkgroup IDs.
The last four bits of a Motorola Type II talkgroup ID (a binary 16-bit
code) are the status bits. In some systems, status bits identify special
situations (such as an emergency status).
Your scanner is preset to assume that the status bits in a talkgroup ID
are set to 0 and ignores them. For example, when the scanner receives the
talkgroup ID 010111001110 0011, it reads the ID as 010111001110 0000 and
converts the first 12 bits of the ID to 23776 (the talkgroup ID). However,
since the status bit value is 3 (0011 converted to decimal equals 3), the
ID is actually 23779.
If you are scanning a Motorola Type I system and do not have a fleet map
for that system, you might have to turn off status bit ignore in order to
determine the proper fleet map.
IMPORTANT: If you are scanning any system other than a Motorola Type I
system, be sure status bit ignore is set to ON or you will
miss some transmissions.
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 /\ to select ON or \/ to select OFF, then press E (SVC).
Identifying a Trunked Frequency
While ID scanning (looking for IDs within a trunked system) or performing
an ID search, press \/ to see the current trunked frequency. (The
frequency flashes twice.) Then hold down \/ until a confirmation tone
sounds and the ID and the frequency alternately appear. To return to
normal operation, press \/.
Selecting the EDACS Talk Group ID Format
The EDACS system uses two group ID formats: Decimal and Agency-Fleet
Subfleet (AFS). If you use a list of IDs shown in one format (for example
AFS) and the ID you want to receive is in the other format (for example,
decimal), press SVC (E) to switch to the decimal format. The ID appears
in decimal format. E flashes on the display when the decimal format is
selected.
EDACS Talk Group ID Range Search
To search EDACS IDs faster, set a range for the Agency or Fleet listings.
Enter the Agency (or the Agency and the Fleet) listing numbers using the
number keys, then press SRC (LIMIT). Note the following examples.
Example 1
Agency = 01
Press 0 1. SRC (LIMIT)
01--- appears during search.
Example 2
Agency = 01 Fleet = 01
Press 0 1.0 1 SRC (LIMIT)
01-01- appears during search.
To stop an ID range search, press SRC (LIMIT).
Using HOLD to Monitor an Active Talk Group ID
Follow these steps to stop scanning and keep the scanner turned 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 Memory
To store a talk group ID into a temporary monitor memory, press MON/CLR
(.). This lets you store the ID prior to moving it into a list memory.
Press SRC to resume searching.
Note: To program the ID stored in the monitor ID memory into the ID scan
list, see "Moving Talk Group IDs to Talk Group ID Lists" below.
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 lists(s). See "Using Talk Group ID Lists" below.
To lock out an ID, press L-OUT (S/S) when the ID appears. The ID is locked
out, and the next active ID appears.
Unlocking a Single Talk Group ID
1. Hold down L-OUT (S/S) until you hear two short beeps.
2. Repeatedly press \/ or /\ to select the ID you want to unlock.
3. Press L-OUT (LS/S). The ID is unlocked, and the next locked ID
appears.
4. Press SRC (LIMIT) to resume the scanner's previously selected function
Unlocking All Talk Group IDs
Hold down L-OUT (S/S) while searching until you hear two short beeps, then
press E (SVC) to unlock all the IDs at once. The scanner beeps twice.
Press L-OUT/SS to resume the search.
Note: When you unlock all the IDs, the scan list appears. Press SCAN to
scan the IDs stored in your scan lists or press SRC (LIMIT) to
resume the scanner's previously selected function. For more
information about scan lists, see "Using Talk Group ID Lists" below.
Using Trunk Scanning Scan Delay
Sometimes a user might pause before replying to a transmission. You can
set the scanner to hold on an ID for 5 seconds to wait for a reply. That
way, the scanner continues to monitor the ID for 5 seconds after the
transmission stops before resuming scanning.
Press DELAY to turn trunk scanning scan delay on or off. DLY appears when
the scan delay is set to on.
Note: If you consistently miss responses even with scan delay turned on,
change the default system type or the fleet map being used. See
"Scanning Type I and Hybrid Trunked Systems" below.
Monitoring Talk Group IDs
You can use your scanner's display to monitor the frequencies/talk group
IDs of a trunked system for activity. While you cannot hear conversations
in this mode, it is an excellent way to determine which talk group IDs are
the most active. To set the scanner to monitor IDs, hold down MON/CLR (.)
until SEARCH and the channel number flash. All activate group IDs appear
in quick succession. To stop monitoring IDs, press SRC again.
BANK A 2
TRUNK
M
: CH 7344
SEARCH
Note: When you monitor IDs, any IDs you have locked out also appear.
Channel Activity Bars
Your scanner displays up to 20 channel activity bars for the stored
frequencies in a bank. These bars indicate the activity taking place on a
trunked system. By observing these bars, you can see how many frequencies
are being used and generally monitor how much communication traffic occurs
Each frequency you store in a trunking bank has a corresponding activity
bar. However, there are only 20 bars for a possible maximum of 50
frequencies. If the trunk system contains more than 20 frequencies, some
bars will represent more than one frequency.
If a bar appears steadily without any voice transmission, it represents
the frequency in use as the data channel.
BANK A 2
TRUNK
M : CH -- ---
SEARCH
If a bar appears and flashes when an ID appears, the bar represents the
frequency being used by the trunk system transmitter.
BANK A 2
TRUNK
M
8 CH 8:40
SEARCH
If a bar appears without any voice transmission, the channel is probably
being used for a telephone interconnect call or a private call, or the
bar might be a locked-out ID. Your scanner does not monitor these types
of calls.
If the scanner is holding on an ID which is not being used, the other
activity bars turn on and off as other groups use the system.
Using Talk Group ID Lists
When you program trunked frequencies into a bank (see "Storing Trunked
Frequencies" above), your scanner sets up 5 scan lists for that one bank
in which you can store your favorite IDs. Each list can contain up to 10
IDs, for a total of 50 IDs for each trunk scanning bank. If you use
all the banks as trunking banks, you can store 1000 IDs.
Talk group ID lists help you to 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 emergency medical service IDs, and so on.
Once you store all the IDs in a list, you can scan them just as you scan
conventional channels. You can program IDs into talk group ID lists
manually, during a search, or automatically.
Manually Storing Talk Group IDs in Talk Group ID Lists
1. Select the trunking bank you want to use (see "Scanning a Trunked
Bank" above).
2. After the scanner begins trunk scanning, press MAN. A number showing
the current talk group ID list appears at the top of the display, and
bars appear that show activity in other banks.
3. Press MAN again, then repeatedly press /\ or \/ to select the talk
group ID list location (shown at the top of the display) where you
want to store an ID. Then press PROG.
4. Enter the type of ID you want to store, then press E.
To enter a Type I ID, use the number keys to enter the block number
and the fleet number, then press (.). Enter the subfleet number and
press E.
To enter a EDACS ID, use the number keys to enter the agency number,
then press (.). Next, enter the fleet number and the subfleet number,
then press E.
Note: To clear a mistake while entering an ID, press 0 then E, then
start over at Step 1.
5. Repeatedly press PROG or /\ to select the next scan list location you
want to program. Then repeat Step 4 to enter another ID.
6. When you finish, press E to store the entries.
Moving Talk Group IDs to Talk Group ID Lists
1. Press MAN. MAN appears.
2. Select the ID scan list location where you want to store the IDs, then
press PROG. PGM appears.
3. Press MON/CLR. A monitor ID appears.
4. Press E. The scanner stores the IDs into the selected ID scan list.
Scanning the Talk Group ID Lists
Press SCAN to begin scanning the lists you have stored.
Note: If one or more of the IDs you stored are incorrect, Error flashes
twice and the scanner beeps several times, then the scan list
numbers appear at the top of the display. To correct the entry,
delete at least one of the incorrect IDs (see "Deleting a Stored
Talk Group ID List" below).
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 of the five scan lists must always be active. You cannot
remove all of them.
To restore a scan list to active scanning, use the number keys to enter
the number of the list again.
Press SRC to return to the previously selected function.
Deleting a Stored Talk Group ID List
1. Press PROG. PGM appears.
2. Repeatedly press /\ or \/ to select the talk group ID list location
(shown at the top of the display) you want to delete.
3. Press O then E.
Priority Talk Group ID Scanning
You can assign a priority to a favorite ID so during scanning the scanner
checks that ID more frequently than the others in the list. Each of the
five memory locations reserved for storing lists (see "Using Talk Group ID
Lists" above) can have only one priority ID, and the ID assigned that
priority in List 1 has the highest priority of all.
To assign a priority to an ID, press PROG. Enter the desired ID number
(list number and location number), then press PRIORITY (H/S). P appears.
To turn priority ID scanning on or off, repeatedly press PRIORITY (H/S)
during ID scanning or manual operation. PRI appears when priority scanning
is turned on.
Note: Priority ID scanning does not operate when priority IDs are locked
out. See "Locking Out Talk Group IDs" above.
Scanning Type I And Hybrid Trunked Systems
Your PRO-94 is preset to scan Type II system IDs. When you scan trunked
frequencies, each Type II user ID you see appears as an even number
without a dash (example 2160). Your PRO-94 can also scan Type I trunked
systems. Each Type I ID appears as a three- or four-digit number, followed
by a hyphen, followed by a one-or two-digit number (example 200-14).
If you notice a mix of odd-and even-user IDs (examples 6477, 2160, 6481,
6144 and 1167), then you are probably monitoring either a Type I or hybrid
(a combination of Type I and Type II user IDs) system with the S-Bit
function turned off (see "Types of Trunking Systems" and "Turning the
Status Bit Ignore [S-bit] On or Off" above).
Subfleet information is included with the frequency list for a Type I
system. To enter the provided map, see "Programming a Fleet Map" below.
Note: Review the content of website www.trunkscanner.com to locate
suitable fleet map information.
If you do not already know the size codes used, you will have to guess.
Since you do not have to figure out all the blocks at one time, this is
not as hard as it might seem. Select a size code for a block, then press
SRC. Now listen to the communications. If you decide you are receiving
most of the replies to the conversations, then you have probably selected
the right size code and can begin programming the next block of the map.
There are 16 preset fleet maps to choose from, and it is best to start
with these when setting up a Type I or hybrid trunk scanning bank. If
none of the following preset fleet maps allow you to follow complete
conversations, then you probably need to program your own fleet map (see
"Programming a Fleet Map" below).
E1P1 E1P2 E1P3
Block Size Code Block Size Code Block Size Code
0 S11 0 S4 0 S4
1 S11 1 S4 1 S4
2 S11 2 S4 2 S4
3 S11 3 S4 3 S4
4 S11 4 S4 4 S4
5 S11 5 S4 5 S4
6 S11 6 S4 6 S12
7 S11 7 S4 7 (S12)
E1P4 E1P5 E1P6
Block Size Code Block Size Code Block Size Code
0 S12 0 S4 0 S3
1 (S12) 1 S4 1 S10
2 S4 2 S12 2 S4
3 S4 3 (S12) 3 S4
4 S4 4 S4 4 S12
5 S4 5 S4 5 (S12)
6 S4 6 S4 6 S12
7 S4 7 S4 7 (S12)
E1P7 E1P8 E1P9
Block Size Code Block Size Code Block Size Code
0 S10 0 S1 0 S4
1 S10 1 S1 1 S4
2 S11 2 S2 2 S0
3 S4 3 S2 3 S0
4 S4 4 S3 4 S0
5 S4 5 S3 5 S0
6 S4 6 S4 6 S0
7 S4 7 S4 7 S0
E1P10 E1P11 E1P12
Block Size Code Block Size Code Block Size Code
0 S0 0 S4 0 S0
1 S0 1 S0 1 S0
2 S0 2 S0 2 S0
3 S0 3 S0 3 S0
4 S0 4 S0 4 S0
5 S0 5 S0 5 S0
6 S4 6 S0 6 S0
6 S4 7 S0 7 S4
E1P13 E1P14 E1P15
Block Size Code Block Size Code Block Size Code
0 S3 0 S4 0 S4
1 S3 1 S3 1 S4
2 S11 2 S10 2 S4
3 S4 3 S4 3 S11
4 S4 4 S4 4 S11
5 S0 5 S4 5 S0
6 S0 6 S12 6 S12
7 S0 7 (S12) 7 (S12)
E1P16
Block Size Code
0 S3
1 S10
2 S10
3 S11
4 S0
5 S0
6 S12
7 (S12)
Selecting a Preset Fleet Map
1. Set the scanner for conventional scanning and press PROG then TRUNK to
select the bank to store the fleet map.
2. Press a number key to select the bank to store the fleet map.
3. Repeatedly press \/ or /\ to select E1, then press E. A previously
programmed trunked frequency appears.
4. Press DATA (ALT).
5. Repeatedly press \/ or /\ to select the name of the desired map
(example E1P7). The preprogrammed fleet map appears.
6. Press E (SVC), then press SRC (LIMIT). The scanner then searches for
transmissions using the preset map you chose.
Note: When the scanner searches for transmissions, you see Type I fleet
and subfleet IDs such as 100-12, 100-9, 000-12, or 400-8.
How do you know if the preset map you selected is correct? Listen to find
out if you are following complete conversations. If not, try another
preset map.
Programming a Fleet Map
1. Set the scanner for conventional scanning. Press PROG, then press
TRUNK.
2. Press the number key of the bank where you want to store the fleet
map.
3. Repeatedly press /\ or \/ until E1 appears, then press E. A trunked
frequency you previously programmed appears.
4. Press DATA. A preprogrammed fleet map appears.
5. Repeatedly press /\ or \/ until USr appears. Then press E.
6. Press DATA.
7. Repeatedly press /\ or \/ to select the size code for the first block,
then press E. The next available block appears.
BANK A 1 size code
TRUNK /
/
M /
B1 5-0
/ PGM
/
Block
8. Repeat Step 7 until you have selected a size code for each desired
block.
9. Press SRC (LIMIT). The scanner exits the trunking programming made,
tunes the data channel, then searches using the map you programmed.
Note: If you select size code S-12, S-13, or S-14, these restrictions
Apply.
S-12 can only be assigned to Blocks 0, 2, 4 or 6.
S-13 can only be assigned to Blocks 0 and 4.
S-14 can only be assigned to Block 0.
Since these size codes require multiple blocks, you will be prompted for
the next available block when you program a fleet map. For example, if
you assign Block 0 as S-12, the scanner prompts you for b2, the next block
available, instead of b1. If you assign Block 0 as S-14, you would not
see another prompt because S-14 uses all available blocks.
Programming the Base and Offset Frequencies
To properly track Motorola VHF and UHF trunked systems, you must program
the applicable base and offset frequencies for each system.
A list of these frequencies can be found at www.trunkscanner.com and other
similar frequency resources.
1. Set the scanner for conventional scanning. Press PROG then press TRUNK
2. Press the number key of the bank where you want to store the fleet map
3. Repeatedly press \/ or /\ to select E2-VHi or E2-UHF, then press E.
A previously programmed trunked frequency appears.
4. Press DATA (ALT). The preset base frequency appears.
5. Enter a desired frequency.
6. Press DATA (ALT). The preset offset frequency appears.
7. Enter the frequency using the number keys according to the following
guide.
For Motorola Type II VHF, (E2-VHF Hi band) use 5 kHz steps between
5 kHz - 100 kHz.
For Motorola Type II UHF, (E2-UHF band) use 12.5 kHz steps between
12.5 kHz-100 kHz.
Programming a Hybrid System
A hybrid system is simply a Type I system with some of its blocks
designated as Type II blocks. To program a hybrid system, follow the
steps listed in "Programming a Fleet Map" above. However, if you want a
block to be Type II, instead of pressing \/ or /\ to select the size block
(Step 7), enter size code S-0 instead.
Turning On/Off the Motorola Disconnect Tone Detect Function
While trunking a Motorola system, your scanner automatically tunes to the
data channel when it detects a disconnect tone (a code that tells the
trunking system that the transmitter has finished sending) on the voice
channel.
You can manually turn off the function so the scanner does not tune to the
data channel under those conditions. You might use this feature to listen
to weak transmissions when conversations are generally disconnected.
To turn the disconnect tone detect function on or off, set the scanner to
trunk track then press SVC. The scanner beeps and DATA flashes for about
5 seconds.
Notes: To set the scanner so it remains on the voice channel (even when a
disconnect tone is transmitted or there is no signal at all) set
SQUELCH so you hear a hissing.
You cannot use the disconnect tone detect function if you are
programming a trunking frequency or a fleet map.
To set the scanner to automatically tune to the data channel once again
when it detects a disconnect tone, press SVC (E).
(BR EB 12/7/99)
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