Kenwood TS-820S Instruction Manual page 11

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 tubes can
be protected against damage due to overloading
during adjustment. Since the KEY circuit is ino-
perative in the TUN mode, the transceiver cannot
be used for transmission or reception.
@ VOX SWITCH
This two-position lever switch selects 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.
CW:
Used for CW operation
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 CWo
use
Used for USB operation It is internationally de.
termined that the 14. 21 and 28 MHz bands be.
long to USB.
@
NB SWITCH
LSB The NB switch turns the built-in noise blanker circuit on and
off. The noise blanker is designed to reduce pulsating igni-
tion type noises. When the lever switch is flipped up. the
circuit is turned on.
Used for LSB operation. It is internationally de-
termined that the 3.5 and 7 MHz bands belong to
LSB.
For RTTY operation with teletypewriter.
@ MONI (MONITOR) SWITCH
This switch is used to demodulate part of the output of the
transmit IF amplifier for monitoring transmit signals.
@) COMP lEVEL KNOB
Pull this knob during sse 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.
~
@ AGC SWITCH
The AGC switch controls the AGC (Automatic Gain Control)
circuit giving the operator three choices:
OFF:
It may be desirable to turn the AGC off when re-
ceiving a very weak signal.
@ 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 individual operator.
FAST:
The FAST AGC position is designed for use in CW
operation.
@ ANTI VOX KNOB
This control adjusts the level of the anti VOX signal fed in to
the VOX circuit. Adjust the control to prevent feedback of
the speaker from tripping the VOX circuit.
SLOW:
Use the SLOW AGC position for SSB operation
@ PHONES JACK
The headphones jack allows use of a 4 to 16 ohm set of
headphones with a 1/4" phone plug attached. When the
phones are plugged into the transceiver. the speaker is dis-
connected.
@ 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.
@ MIC CONNECTOR
The microphone connector is four pronged. allowing use of
the PTT microphone. Figure 2 shows how to wire the plug
on the microphone cable.
@ 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.
@ MODE SWITCH
The MODE switch is used for selection of type of waves or
for TUNE operation.
@ RIT SWITCH
This is the switch for the AfT (receiver incremental tuning)
circuit To turn on the circuit, press this switch; to turn off,
press it once again. The AIT indicator is illuminated when
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