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®PREAMP/ATT
(Attenuator)
SWITCH
(§)MONITOR/MARKER SWITCH
(§)MARKER CALIBRATOR
(0MONITOR LEVEL CONTROL
(§)ANTI-VOX
CONTROL
This switch
selects
the
RF
preamplifier to
amplify
weak
receive
signals
or the
RF
attenuator to prevent overloading of the
receiver.
Refer to
SECTION
7
-
14
for
more
Information.
This switch turns the
MONITOR
or
MARKER
circuit
ON
or
OFF,
•
Vary
the
monitor
level
with
the
MONITOR LEVEL CONTROL.
•
A
calibration
marker
is
generated every
10kHz when
the
circuit
is
activated.
This control
varies
the
marker
frequency.
Use an
accurate standard
_
frequency
source such
as
radio station
WWV/WWVH
to calibrate the
marker
generator.
See
SECTION 12-3
(2)
for
more
information.
This control changes the audio
level
of the
CW
sidetone or
SSB
monitor
circuit
when
the
MONITOR
SWITCH
on
the
top
panel
is
turned
ON.
Adjust
the control
for the desired
monitor volume.
When
using the
VOX
function,
sound from
the speaker
may
cause
unwanted
switching of the
T/R
relay.
Adjust
this
control
in
con-
junction
with
the
VOX
GAIN
CONTROL
so the
T/R
relay
switches
only
from
the
operator's voice
and
not
from
the speaker audio.
3-4
REAR PANEL
©
#
@ANTENNA
CONNECTOR
Connect
a
50
ohm
impedance antenna
to
this
connector.
The
con-
nector
mates
with
a
PL-259
plug.
®T/R CONTROL
JACK
[RELAY]
(§)
EXTERNAL ALC
JACK
[ALC]
(§)
RECEIVE
ANTENNA
OUTPUT
[RECEIVE
ANT
OUT]
An
output
signal
from
this
jack controls the transmit/receive switch-
ing
of
an
external amplifier or
transverter.
NOTE:
DO NOT
attempt
to switch
greater
than
50
volts,
0.5
ampere.
This
jack accepts
an automatic
level
control
signal
from
an
external
amplifier or
transverter.
The
ALC
voltage
must
be
in
the range of
0
volts
to
—4
volts.
The
receive signals
from
the
ANTENNA CONNECTOR
pass
through
the transmit/receive
antenna
switching
circuit
to
this jack.
Normally,
the
receiver
IN
and
OUT
jacks are
connected
together with
a
jumper.
The
ANTENNA
OUTPUT JACK
is
useful
when
operating with
a
separate
receiver
or
an
external preamplifier.
-
13
-
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