RadioShack Pro 92b Handheld Scanner Owners Manual

51Trunking Operation
Notes:
 
• If you select 
-- instead of LT, MO, or ED, the
scanner does not scan trunked frequencies.
Instead, you see:
• If you programmed a Motorola Type I or Hybrid
system, see “Programming Fleet Maps” on
Page 53.
3. Press 
PGM to enter the program mode.
4. Store the trunking frequencies into subsequent
channels in the same bank (see “Storing Known
Frequencies into Channels” on Page 30).
5. Repeatedly press 
MODE to select the trunking mode
— 
LT for EF Johnson, MO for Motorola,...

52
Trunking Operation
Notes:
• Base and offset frequencies vary for each type of
trunking system. You can get information about
these frequencies for the trunking system you want
to scan using 
www.trunkscanner.com, other Int er -
ne t sou rc es,  o r lo cal ly-published guidebooks.
• The scanner automatically decodes subaudible data
it receives in the VHF band.
• If you try to enter an offset frequency in the VHF and
UHF-Hi bands (137–174 and 806–960 MHz), the
scanner will ignore the entry.
Follow these...

53Trunking Operation
PROGRAMMING FLEET MAPS
You must set the fleet map if you want to receive a Mo-
torola Type I system. Fleet maps are included along with
other information about Motorola Type I systems at
www.trunkscanner.com. 
Follow these steps to program a fleet map.
1. Press 
PGM then TRUNK.
2. For each bank you want to program, repeatedly
press 
FUNC,  , or   to select the bank.
3. Press 
FUNC.
4. Press 
8. The following display appears:
5. Enter the size code supplied with the Type I system...

54
Trunking Operation
6. Press ENTER for each entry. If you make a mistake,
press 
CL and enter the correct size code.
Note:
 The default setting of the bank is for Motorola
Type II. However, if you set Type I and you want to
return to Type II, enter 
15 at Step 5.
7. To confirm the input, repeat Steps 1–5 and press
ENTER. Each time you press ENTER, you confirm
the size code. If you find an error, press 
CL and
begin again at Step 1.
8. Press 
SCAN to start scanning.
TALK GROUP IDS
You can program up to...

55Trunking Operation
Storing Talk Group IDs
To store a talk group ID when scanning, press TRUNK
when the scanner stops on a transmission. The bottom
line changes to 
ID#XXXX, indicating that the ID is
stored.
Note:
 When you try to store more than 100 talk group
IDs in a bank, 
Memory full! appears. Clear some
talk group IDs in order to store new ones (see “Clearing
Talk Group IDs” on Page 56).
Follow these steps to manually store talk group IDs or to
edit a stored ID.
1. Press 
PGM.
2. Press 
TRUNK.
3....

56
Trunking Operation
Locking Out Talk Group IDs
Note:
 You can only lock out talk group IDs when the
scanner is in the closed mode (see “Open and Closed
Modes” on Page 57).
1. Press 
PGM.
2. Press 
TRUNK.
3. Press 
FUNC,  or   to move the desired bank.
4. Press   or   to select the ID memory.
5. Press 
L/OUT to lock out the ID. L appears.
6. To remove the lockout from a trunking ID, manually
select the ID memory, and press 
L/OUT until L dis-
appears.
Reviewing Locked-Out Talk Group IDs
Note:
 You...

57Trunking Operation
1. Press PGM.
2. Press 
TRUNK to enter a talk group ID memory
mode.
3. Select a talk group ID bank using 
FUNC,   or  .
4. Press 
FUNC then 3. Confirm list clear
?1=YES
 Press other key for NO. appears.
5. Press 
1 to clear the all talk group IDs within a bank.
Please Wait then List Cleared appears.
Note:
 To cancel the deletion, press any key except 
1.
The scanner returns to the talk group ID memory mode.
OPEN AND CLOSED MODES
When set to the open mode, the scanner only uses the
ID...

58
A General Guide to Scanning
When no ID code is programmed into the scanner, it re-
ceives the signal in PL, DPL, LTR, MOT, or ED mode.
Changing the Open/Closed Mode
1. Press MANUAL.
2. Press 
FUNC then   or   to select the channel
storage bank.
3. Press 
FUNC then 2. Bank OPEN or Bank
CLOSED
 appears. After that message disappears,
the 10th digit on the top line of the display changes
from 
+ to –
 or vice versa.
4. Repeat Steps 2–3 for each bank.
ˆA General Guide to 
Scanning
Reception of the...

59A General Guide to Scanning
GUIDE TO FREQUENCIES
US Weather Frequencies
Ham Radio Frequencies
Ham radio operators often transmit emergency informa-
tion when other means of communication break down.
The chart below shows the frequencies the scanner re-
ceives that ham radio operators normally use:
Birdie Frequencies
Every scanner has birdie frequencies. Birdies are sig-
nals created inside the scanner’s receiver. These oper-
ating frequencies might interfere with transmissions on
the same frequencies....

60
A General Guide to Scanning
To find the birdies in your scanner, begin by disconnect-
ing the antenna and moving it away from the scanner.
Make sure that no other nearby radio or TV sets are
turned on near the scanner. Use the search function and
scan every frequency range from its lowest frequency to
the highest. Occasionally, the searching will stop as if it
had found a signal, often without any sound. This is a
birdie. Make a list of all the birdies in your scanner for fu-
ture reference.
42.9750...