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VOX SWITCH
This
two-position lever switch seiects one of the following
functions.
MAN:
With the switch in this position. the transceiver is
switched into transmit or receive by the stand-by
switch or the PTT switch on the microphone.
VOX: With the switch in this position. the VOX circuit is
turned on for voice operated transmit on SSB se-
mi-automatic break-in operation on CW.
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NB SWITCH
The NB switch turns the built-in noise blankercircuit on and
off. The noise blanker is designed to reduce pulsating igni-
tion type
nolses. When the lever switch is flipped up. the
c~rcuit is turned on.
MONl (MONITOR) SWITCH
This switch is used to demodulate part of the output of the
transmit IF amplifier for monitoring transmit signals.
AGC SWITCH
The AGC switch controls the AGC (Automatic Gain Control)
c~rcuit giving the operator three choices:
OFF
It may be
desirable
to turn the AGC off when re-
celv~ng a very weak s~gnal
FAST:
The FAST AGC position is designed for use in CW
operation.
SLOW:
Use the SLOW AGC position for SSB operation.
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PHONES JACK
The headphones
jack allows use of a
4
to
16
ohm set of
headphones
wlth a
1/4"
phone plug attached When the
phones are plugged
Into the
transceiver.
the speaker 1s dls-
connected
MIC CONNECTOR
The microphone connector is four pronged. allowing use of
the PTT microphone. Figure 2 shows how to wire the
p!ug
on the microphone cable,
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MODE SWITCH
The MODE switch is used for selection of type of waves or
for TUNE
o~eration.
TUN: Used for adjustment of transmit conditions. The
input power to the final stage is low as compared
with that for CW so that the final stage
tube,s can
be protected against damage due lo overloading
during adjustment.
Since the KEY circuit is ino-
perative in the TUN mode. the
transceaver cannot
be used for transmission or reception.
CW: Used for CW operation
USB: Used for
USE operation. It is internationally de-
termined
Chat the
14.
21
and 28 MHz bands be-
long to
USE.
LSB Used for LSB operation. It is internationally de~
termined that the
3.5
and
7
MHz bands belong to
LSB.
FSK:
For RTTY operation with teletypewriter
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COMP LEVEL KNOB
Pull this knob during SSB operation. The speech processor
is activated and the talk-power is increased. Adjust the
state of compression by turning the knob while observing
the COMP meter.
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DELAY KNOB
The DELAY control adjusts the holding time of the VOX cir-
cuit for VOX or break-in CW operation. The control will have
to be adjusted to the preference of the
indtvidual operator.
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ANTI VOX KNOB
This control adjusts the level of the anti VOX slgnal fed in to
the VOX circuit. Adjust the control to prevent feedback of
the speaker from tripping the VOX circuit.
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VOX GAIN KNOB
This control adjusts
the sensitivity of the VOX circuit by ad-
justing the gain of the VOX amplifier. for voice controlled
operation.
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RF
ATT SWITCH.
With this switch set
to ON. ATT (attenuator) of about 20 dB
is connected to the antenna circuit. protecting the RF ampli-
fier and
mixer
circuit from strong input signals.
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RIT SWITCH
This is the switch for the RIT (receiver incremental
tuning1
ctrcuit. To turn on the circuit. press this switch: to turn off.
press it once again. The RIT indicator is
illumanated when