Kenwood TS-120S Operating Manual page 11

4.1.4. RIT CONTROL
By using the RIT (Receiver Incremental Tuning) control, the
receive frequency can be shifted by about + 1.5 kHz without
changing the transmit frequency.
If the frequency of the station you are working changes, your
receive frequency can be reset by turning the RIT switch ON
and adjusting the RIT control. Adjusting the control
clockwise increases the frequency. The RIT shift can be
checked by the digital display. When first calling another
station, the RIT should be OFF, otherwise your transmit and
receive frequency will coincide.
4.1.5. IF SHIFT CONTROL
The IF SHIFT control is used to shift the passband of the IF
filter without changing receive frequency. By turning this
control in either direction, the IF passband is shifted as
shown in Fig. 4-3.
The IF SHIFT is effective in eliminating interference when
the receive signal is superinposed on nearby signals during
operation in USB, LSB or CW mode.
Turned in @ direction
=
Turned in © direction
=
IF filter passband
characteristic
|
\
X 0
X
Interfering signal Interfering signal
RIT—@)>- IF SHIFT RIT—@>-IF SHIFT RIT —@> IF SHIFT
0
<\N -AN
e€ oO ® Oo
Turn in @ direction
to eliminate inter-
ference from signal @)
Turn in © direction
to eliminate inter-
ference from signal ©
Fig. 4-3 IF SHIFT CONTROL
(1) USB Mode
Adjust the IF SHIFT control in the @ direction and lower
frequencies are cut. Adjust the control in the © direction
and high frequencies are cut.
(2) LSB Mode
Adjust the control in the @ direction and higher frequencies
are cut. Adjust the control in the © direction and low fre-
quencies are cut.
(3) CW Mode
By using the IF SHIFT in conjunction with the RIT, tone
quality can be adjusted.
4.2 TRANSMISSION (Fig. 4-4)
CAUTION:
Before transmitting, be sure to connect an antenna or dum-
my load with a VSWR of less than 1.5:1. Never attempt to
transmit with the antenna terminal left open.
When testing the transmitter, connect a 50-ohm dummy
load, rated at more than 100W (TS-120S), 10W (TS-120V).
Refer to Fig. 4-1 for initial control settings.
When the TS-120S(V) is ready for transmission, use the
following procedure:
SSB Operation
Set the MODE switch to LSB or USB.
Meter switch to ALC.
Standby switch to SEND.
Speak into the microphone and adjust the MIC GAIN for
meter deflection within the ALC zone at signal peaks.
PBWN-@e@
@ CW Operation
1 Set the MODE switch to CW and the meter switch to
ALC.
2 Set the standby switch to SEND and adjust the CAR
control so the meter deflects within the ALC zone. If a
key is connected, it should be depressed during the ad-
justment.
TS-120S
Power meter
Dummy load
Fig. 4-4 Testing with Dummy Load or
Power Meter
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