Radio Shack PRO-2052 - Manual (Page 34)

34
Hint: While scanning, you will not
know exactly whom the talkgroup IDs
are assigned to until you listen awhile
or until you locate talkgroup ID lists in
frequency guides or on internet sites
such as www.trunkscanner.com. With-
in a few minutes, you can usually fig-
ure out if what you are listening to is a
police, fire, or emergency medical 2-
way radio user. Other talkgroup IDs
might take some time, but determining
whom each ID represents is half the
fun of trunk scanning!
Turning Banks On or Off
During Trunk Scanning
As in conventional scanning, you can
turn each channel-storage bank on
and off during trunk scanning. When
you turn off a bank, the scanner does
not scan any of the 50 channels in that
bank.
1. Press DATA . All active trunk bank
numbers appear.
2. Press the number key for the bank
you want to add or delete.
If the bank number is off, the scanner
does not scan any of the channels
within that bank.
Skipping the Trunked Bank
To skip to another trunked bank while
you are listening to a trunked bank,
hold down
DATA .
Turning Status Bit Ignore
On or Off
You can set how your scanner works
with
status bits (also called S-bits), let-
ting you control how the scanner inter-
prets 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, sta-
tus 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 talk-
group 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 deter-
mine 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 transmis-
sions.
20-432.fm Page 34 Friday, July 14, 2000 11:30 AM