Manual RadioShack PRO-94 - 1000-Channel (page 47 of 72) (English)

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Trunking Operation

Monitoring Talk Group IDs

You can use your scanner’s display to monitor the fre-

quencies/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

and the channel num-

ber flash. All active group IDs appear in quick succes-

sion. To stop monitoring IDs, press

SRC

again.

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 be-

ing used and generally monitor how much communica-

tion traffic occurs.

Each frequency you store in a trunking bank has a corre-

sponding 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 transmis-

sion, it represents the frequency in use as the data

channel.

• If a bar appears and flashes when an ID appears,

the bar represents the frequency being used by the

trunk system transmitter.

• 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.

20-524A.fm Page 47 Tuesday, June 27, 2000 3:41 PM

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RadioShack PRO-94 - 1000-Channel Manual

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