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19
UNDERSTANDING YOUR
S
CANNER’S CHANNEL
R
ECEIVE MODES
You can program each channel
with any one of six receive modes
(AM, FM/Digital, CTCSS, DCS,
Motorola, and EDACS).
Each receive mode affects how
your scanner operates when
scanning and receiving
transmissions.
Ô
AM Mode (AM)
The AM mode sets the scanner to
receive transmissions using
amplitude modulation (AM),
primarily used for aircraft, military,
27 MHz citizen’s band, some
amateur radio, and some
government transmissions. (Refer
to “Specifications” on Page 110 for
a list of the frequencies covered.)
When the scanner receives a
transmission on a channel set to
the AM mode, it always stops on
the transmission.
FM/Digital Mode (FM)
The FM/Digital (FM) mode sets
the scanner to receive
transmissions using frequency
modulation (FM) and APCO-25
digital modulation. FM is used for
most public safety transmissions,
as well as broadcast, business,
and amateur radio transmissions.
APCO-25 digital modulation is
used in many newer conventional
and trunked public safety radio
systems. When the scanner
receives a transmission on a
channel set to the FM/Digital
Ó HINT Ó
For example, if you
wanted to find active
frequencies between a
range of 150.1000 and
150.5000,youwouldput
both of those
frequencies in the limit
search bank.
Ô NOTES Ô
• Trunked modes
(ED and MOT) can
only be selected
for frequencies
above 137 MHz.
• Your scanner’s
Closed Mode lets
you hear
transmissions
from only those
trunking
talkgroups you
specify. For more
information, see
“Open and Closed
Mode Operation”
on Page 87.