Pacific
Crest
Corporation
ADL
Vantage
User’s
Guide
19
Carrier
Sense
Multiple
Access
(CSMA)
CSMA
is
a
technology
implemented
in
ADL
Vantage
base
radios
to
meet
the
United
States
Federal
Communication
Commission
(FCC)
transmitter
requirements.
It
is
illegal
to
transmit
on
any
UHF
radio
within
the
United
States
without
CSMA
enabled.
CSMA
holds
off
the
radio
transmission
if
the
frequency
is
currently
being
used
by
a
co
‐
channel
user.
On
occasion,
you
may
note
that
the
radio
broadcasts
stop
for
short
periods
of
time.
Most
often,
this
is
a
case
of
co
‐
channel
interference
and
the
ADL
Vantage
base
radio
is
holding
off
broadcasts
due
to
the
FCC
mandated
CSMA.
GPS
RTK
equipment
is
designed
to
function
with
intermittent
gaps
in
the
data.
Heavy
co
‐
channel
use
may
limit
the
ability
of
the
ADL
Vantage
base
radio
to
transmit
the
required
information.
In
areas
of
heavy
co
‐
channel
usage,
try
changing
channels
to
a
less
used
frequency.
