Kenwood TS-830S Instruction Manual page 16

(6) IF SHIFT
By using the IF SHIFT during reception, the crystal filter
passband frequency can be shifted approximately +1.2 kHz
This is achieved by use of a PLL (Phase-Locked Loop) in the
L.O. (local oscillator) circuit. This is a major feature of the
TS-830S and can be used in the following cases:
1. Adjustment of tone quality and interference rejection
during SSB Reception.
When the transceiver is on 20 meters and above, USB
mode, turn the IF SHIFT in the +" direction and the
lower frequencies are attenuated. Turning the knob in
the —" direction cuts the higher frequencies. (These
procedures are reversed for LSB operation below 20
meters). Adjust the control to your listening
preference. The IF SHIFT is also effective in eliminating
interference from adjacent receive signals.
2. Adjustment of tone quality during CW operation.
For a detailed description, refer to Section 4.4. "'CW"
Operation".
- Unwanted signal
a g
Desired signal
Desired signal
SS
QQOOY
Unwanted signal eliminated by IF SHIFT
2-) & +20 kHz
BFO
IF
SHIFT—@— NOTCH
IF
SHIFT—@)— NOTCH
Fig. 4-5 IF SHIFT Operation
16
(7) VBT AND IF SHIFT IN COMPBINATION
If excessive radio interference is encountered during SSB
Operation, adjust the VBT for optimum bandwidth, and the
IF SHIFT for maximum intelligibility
In CW mode, first adjust the VBT. Turn the IF SHIFT "—"
(counter clockwise), adjusting for approximately 800 Hz
tone. If pitch lower than 800 Hz is desired, adjust the RIT
and IF SHIFT.
=
IF
SHIFT -—@)— NOTCH
es
NARROW NORMAL
NARROW NORMAL
Fig. 4-6 IF SHIFT and VBT in Combination
(8) NOTCH CONTROL
If a single tone such as a CW signal is superimposed on the
receive signal, turn the NOTCH ON and adjust the NOTCH
control to eliminate or minimize the beat signal. A beat of
approximately 1.5 kHz can be eliminated at the center
position of the control. In USB or CW mode, a beat signal
lower than 1.5 kHz can be eliminated by turning the control
clockwise. In LSB mode, adjust the control
counterclockwise.