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Using the Close Call Feature
Using the Close Call Feature
Your scanner's Close Call
TM
feature lets you set the
scanner so it detects, displays the frequency of, and lets
you hear a nearby strong radio transmission. You can set
the scanner so the Close Call feature works "in the
background" while you are scanning other frequencies,
turn off normal scanning while the Close Call feature is
working, or turn off the Close Call feature and use the
scanner normally. You can set the scanner so it alerts you
when the Close Call feature finds a frequency. You can
also set the frequency band where you want the scanner
to look for transmissions.
To turn background Close Call detection on or off, press
then . When the feature is on, appears on the
display and normal operation is briefly interruped about
every 2 seconds.
Notes:
• The Close Call feature works well for locating the
source of strong local transmissions such as mobile
and handheld two-way radios in areas with no other
strong transmission sources. Several factors affect
Close Call performance, however. Performance is
increased with higher transmit power, receive
antenna tuned to the target band, and a low back-
ground RF level. Other than the antenna, you have no
control over these factors, but they explain why per-
formance might vary by both location and time.
• The Close Call feature cannot detect satellite dishes
or any transmitter with a frequency above or below
the frequency ranges listed under “Setting Close Call
Options” on Page 84.
• The Close Call feature works better with some types
of transmissions than others. It might not correctly
display frequency information for transmitters using a
highly directional antenna (such as an amateur radio
beam antenna) or if there are many transmitters
operating at the same time in the same area.
Func
Using the Close Call Feature