42327
Rio
Nedo,
Suite
A
Temecula,
CA.
92590
951
‐
719
‐
3266
www.comtronixcommunications.com
Theory
of
operation
The
unit
has
two
external
antenna
ports
on
the
rear
of
the
unit.
One
is
for
the
transmitter
(TX
Ant)
and
the
other
is
for
the
receiver(RX
Ant).
These
ports
would
be
normally
attached
to
the
customer
supplied
duplexer.
WARNING:
WHEN
TESTING
THE
UNIT
BE
SURE
THE
DUPLEXER
IS
TUNED
PRIOR
TO
APPLYING
RF
POWER
FROM
THE
TRANSMITTER,
AS
RF
IN
EXCESS
OF
0
DBM
INTO
THE
RECEIVER
ANTENNA
PORT
WILL
CAUSE
DAMAGE
TO
THE
RECEIVER
FROM
END.
The
repeater
is
configured
with
one
RF
Power
amplifier
assembly
which
requires
approximately
100
mw
of
drive
from
the
module
marked
“Transmitter”
which
contains
the
control
logic
and
the
TX
‐
RX
board.
The
100
mw
of
RF
is
then
routed
to
the
PA
Amplifier
assembly
and
amplifies
that
signal
to
45
‐
110
watts,
which
is
then
routed
to
the
TX
Antenna
port.
The
repeater
is
configured
with
a
second
control
logic
and
TX
‐
RX
board
in
which
the
receiver
only
is
used
for
full
duplex
operation.
The
receiver
front
end
has
the
addition
of
a
Front
end
protector
circuit
added
to
limit
the
RF
input.
The
receive
signal
enters
the
repeater
from
the
RX
antenna
port
(from
duplexer)
and
it
routed
to
the
module
marked
“Receiver”.
The
receive
signal
is
processed
and
the
recovered
receive
audio
is
then
routed
to
the
Rear
Panel
PCB
and
the
RM
‐
1
Repeater
controller.
Stand
‐
alone
Repeater
During
normal
operation
as
a
stand
‐
alone
repeater,
the
unit
will
repeat
all
traffic
as
long
as
the
proper
RF
signal
with
the
necessary
CTCSS
or
DCS
code
is
present
and
the
“Radio
Aux
I/O”
jumper
plug
is
in
place.
DC
Power
The
Radio
requires
a
good
source
of
13.8
VDC
and
should
draw
less
than
20
amps
during
transmit.
