ADI AR-446 - Page 9

4-2-2 fixed Station
A
regulated
DC
power
supply
(13.8
VDC
capable
of
supplying
at
least
11
Amperes)
is
required.
1. Never connect the AC power cable to the AC outlet until all
other connections have been made.
2. Before connecting and disconnecting the power connector, be
sure
to
turn
OFF
the
POWER
switches
of
both
the
transceiver
and the DC power supply.
3. Observe polarity of the DC power cable. The transceiver
operates on 13.8 VDC, negative ground. Battery polarity must
be correct. The power cable is color coded:
Red ~~ + (Positive polarity)
Biack — — {Negative polarity)
4-2-3 Antenna
The type of antenna that is used will greatly affect the performance of
the transceiver. Use a properly adjusted antenna, of good quality, to
enable your transceiver to perform at its best. The antenna input
impedance is 50 ohms. Use 50-ohm coaxial cable such as RG-8U or
8D-2V
for
this
connection.
If
the
antenna
is
far
from
the
transceiver
the
use
of
low
loss
coaxial
cable,
such
as
RG-8U
is
recommended.
Match
the
impedance
of
the
coaxial
cable
and
that
of
the
antenna
so
that
the
SWR
is
less
than
1.5
to
1.
The
protection
circuit
in
the
transceiver
will
activate
if
the
SWR
is
particularly
poor
(greater
than
3
to
1).
High
SWR
values
will
cause
the
transmitter
output
to
drop,
and
may
lead
to
TVI
or
BCI
reports.
Caution:
We
recommend
that
you
install
a
high
quality
lightening
arrestor
in your antenna lines for protection against fire, electric shock,
personal injury, or damage to the radio litself.