Radio Shack PRO-90 - Manual (Page 40)

40
CHANNEL ACTIVITY INDICATORS
Your scanner has 20 channel activity indicators (bars)
which show the activity taking place on a trunked sys-
tem. You can see how many frequencies are being used
and generally monitor how much communication traffic
is occurring.
Each frequency you store in a trunking bank has a corre-
sponding activity indicator. However, since there are
only 20 indicators, but you can store up to 30 frequen-
cies, some indicators might indicate more than one fre-
quency if the trunked system you are scanning has more
than 20 channels.
• The indicator that remains on steadily even when
there are no current transmissions represents the
frequency being used as the data channel.
• The indicator that flashes when an ID appears rep-
resents the frequency being used by the radio you
are currently hearing.
• If an indicator turns on but you do not hear a conver-
sation, the channel is probably being used for a tele-
phone interconnect call or a private call, or the
indicator 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
active, the other activity indicators turn on and off as
other groups use the system.
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