RadioShack Pro 91 Handheld Trunking Scanner Owners Manual

51
4. Press  again.
5. Repeatedly press s or t to select the name of the
map you want (such as 
E1P7). The prepro-
grammed fleet map appears. 
6. Press 
E, then SRC. 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 cor-
rect? Listen to see if you are following complete conver-
sations. If not, try...

52
When a Type I system is designed, the address infor-
mation for all its user IDs is divided into 8 equal-size
blocks, numbered 0–7, and each block is assigned a
size code. When you set up your scanner to track a
Type I system, you must choose a size code for each
block. When you have chosen a size code for all 8
blocks, you will have duplicated the 
fleet map for the
system you are tracking. If you have chosen correctly,
you will be able to track transmissions in that system.
Each size code defines...

53
The size codes selected by a Type I system designer
depend on the specific needs of the systems users.
Some organizations might want many subfleets with
only a few radios each, while another organization
might want only a few subfleets, with many radios each.
To scan Type I systems, you must select or program a
fleet map with the same size code assignments as the
trunked system. If you do this accurately, you will track
all the fleet and subfleet combinations used by the sys-
tem. In other words, you...

54
E1P4 E1P5 E1P6
BlockSize
Code BlockSize
Code BlockSize
Code
0S120S40S3
1 (S12) 1 S4 1 S10
2 S4 2 S12 2 S4
3S43(S12)3S4
4S44S44S12 
5 S4 5 S4 5 (S12)
6S46S46S12
7 S4 7 S4 7 (S12)
E1P7 E1P8 E1P9
BlockSize
Code BlockSize
Code BlockSize
Code
0S100S10S4
1S101S11S4
2S112S22S0
3S43S23S0
4S44S34S0
5S45S35S0
6S46S46S0
7S47S47S0
E1P10 E1P11 E1P12
BlockSize
Code BlockSize
Code BlockSize
Code
0S00S40S0
1S01S01S0
2S02S02S0
3S03S03S0
4S04S04S0
5S05S05S0
6S46S06S0
7S47S07S4 

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Selecting a Preset Fleet Map
1. Set the scanner for conventional scanning, press
PROG, then press TRUNK.
2. Select the bank where you want to store the preset
fleet map by pressing a number key.
3. Press .
4. Repeatedly press s or t to select 
E1. Then, when
E1 flashes, press E.
E1P13 E1P14
BlockSize
Code BlockSize
Code
0S30S4
1S31S3
2S112S10
3S43S4
4S44S4
5S05S4
6 S0 6 S12
7 S0 7 S12
E1P15 E1P16
BlockSize
Code BlockSize
Code
0S40S3
1 S4 1 S10
2 S4 2 S10
3S113S11
4S114S0
5S05S0
6S126S12
7S127S12
DATA 

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9. Press SRC. The scanner exits the trunking pro-
gramming mode, tunes the data channel, then
begins to search 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 pro-
gramming a fleet map. For example, if...

57
A GENERAL GUIDE TO SCANNING
Reception of the frequencies covered by your scanner
is mainly “line-of-sight.” That means you usually cannot
hear stations that are beyond the horizon.
GUIDE TO FREQUENCIES
National Weather Frequencies
Canadian Weather Frequencies
Note: 
These frequencies are not preprogrammed in the
weather service bank but can be manually programmed
into a channel.
Birdie Frequencies
Every scanner has birdie frequencies. Birdies are sig-
nals created inside the scanner’s receiver. These...

58
GUIDE TO THE ACTION BANDS
Typical Band Usage
Primary Usage
As a general rule, most of the radio activity is concen-
trated on the following frequencies:
VHF BandVHF Band
Low Range 29.00–50.00 MHz
6-Meter Amateur 50.00–54.00 MHz
U.S. Government 137.00–144.00 MHz
2-Meter Amateur 144.00–148.00 MHz
High Range 148.00–174.00 MHz
UHF Band
U.S. Government 406.00–420.00 MHz
70-cm Amateur 420.00–450.00 MHz
Low Range 450.00–470.00 MHz
FM-TV Audio Broadcast, Wide 
Band470.00–512.00 MHz
Public Service...

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UHF Band
Note: Remote control stations and mobile units operate
at 5 MHz higher than their associated base stations and
relay repeater units.
BAND ALLOCATION
To help decide which frequency ranges to scan, use the
following listing of the typical services that use the fre-
quencies your scanner receives. These frequencies are
subject to change, and might vary from area to area.
For a more complete listing, refer to the “Police Call Ra-
dio Guide including Fire and Emergency Services,”
available at your...

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ROAD . . . . . . . . . . . . . . . . . . .  Road & Highway Maintenance
RTV . . . . . . . . . . . . . . . . . Radio/TV Remote Broadcast Pickup
TAXI  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Taxi Services
TELB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Mobile Telephone
(Aircraft, Radio Common Carrier, Landline Companies)
TELC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cordless Phones
TELM  . . . . . . . . . . . . . . . . . . . . . . . ....