RF Concepts RFC 4-110 - Connections and Adjustments; Rear Panel Connectors; Internal Adjustments

delayed,
so
the
relays
do not
"chatter"
while
on
SSB.
(see
"DELAY
AD-IUST"
)
PREAMP
This switch
turns
on
the
GaAs-Fet
preamP. It
can
be
used even
when
the
power
amp
section
is off'
REAR
PANEL
CONNECTIONS
4 PIN
"JONES"..
Power
is
supplied
thru
this connector.
This
allows
quick
removal
of
the
amplifier,
if
needed'
FUSE
A
35 Amp
fuse
provides
protection
in case
of
an
internal
short
circuit.
pHoNE
JACK
.... This
jack
is
the
external
keying
input.
By
changing
a
jumper
inside
the
amplifier,
keying
may
be
a-complished
by
either
a
ground
or
a
positive
voltage
of
+3
to
+15
at
I MA or
less.
See
.,EXTERNAL
KEYING,..
NOTE:
The
unit
is
factory
set
for
"plus
voltage"
keying.
5
pIN
DIN
This
jack
is
used
for remote
control
of
the
ampliiier.
See
the
diagram
"REMOTE
CONTROL".
RADIO
This coax
connector
is the
input
from
the
transmitter
or
transceiver.
ANTENNA
This
is connected
to the
antenna.
INTERNAL
CONNECTIONS
AND
AD.]USTMENTS
DELAY
ADJUSTMENT
.
The
"SSB
delay"
is varied
by
changing
the
potentiometer,
accessibte
through
the hole
in
the
cover on
the
left side
of
the
unit.
EXTERNAL
KEYING
The
amplifier
is factory
set
for
"plus
keying"
keying.
Most transmitters
do
not
provide a
"ground"
during
transmit,
but
most do
have
a
positive
voltage
available
at their
back
paneI.
You must consult
your
instruction
manual,
for
your
particular radio,
to locate
this
voltage.
This is
then connected
to the
phono
jack
on
the
ampJ-if
ier.
To
change the
amplifier
from
"pIus"
keying
to
"ground"
keying
you
must
remove the
cover
and
move
the
wire connected
to the
phono
jack
from
the
"+
To TXr'r
pad
to
the
"
f
To Tx"
Pad.
(see
sketch
page
4)