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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 Close Call detection on or off, press then
. When the feature is on, appears on the display
and normal operation is briefly interrupted 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 background RF level. Other than the
antenna, you have no control over these factors,
but they explain why performance 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 the
Set CC Bands: option on Page 110.
• The Close Call feature works better with some
types of transmissions than others. It might not
correctly display frequency information for trans-
mitters 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