Kenwood TS-440S - Manual (Page 8)

•(0)
Note:-----------------------------------------------------------------------------
The squelch threshold position will vary from mode to
mode, so you may have to readjust when you change
modes.
(0) NOTCH control
The NOTCH function is used to reduce or eliminate het­
erodyne, or CW type signals. The NOTCH filter will not
be effective against SSB, AM or FM type signals. To
use the control, place the NOTCH switch ON and slow­
ly rotate the NOTCH control to reduce the interference.
Normally the notch point will occur between the 11:00
and 1:00 o'clock position.
Notes:----------------------------------------------- ---------------------------
1. The NOTCH frequency can be varied within a range
of approximately 400 to 2600 Hz.
2. When an interfering signal such as a CW station
appears, slowly rotate the NOTCH control. If you
rotate the knob too quickly you may pass right over
the notch point. Slow rotation will yield the best
results.
(Q) IF SHIFT control
Interfering
signal
Receive
signal
Interfering
signal attenuated
by NOTCH control
Receive
signal
/
\
/
Audio output Audio output
(NOTCH OFF) (NOTCH ON)
NOTCH control
Note: —-- ----------------------------------------------------------------------
The IF SHIFT control does not function in the AM or
FM modes.
The IF SHIFT control allows you to shift the IF pass-
band of the receiver without changing the actual center
frequency of the receiver. This control is useful when
there is interference near your center frequency. As the
accompanying illustration shows rotating this control
may place the interfering signal outside the receiver
passband, allowing for easier copy. The operation of
this control in the USB, LSB, AFSK, and CW modes
is detailed below.
• USB mode
Interference from lower frequencies can be reduced
or eliminated by rotating the IF SHIFT control in the
0 direction. This will cause the resulting audio fre­
quencies to have a slightly treble response, i.e.low
cut filter (low frequencies attenuated). Interference
from higher frequencies can be reduced or eliminat­
ed by rotating the IF SHIFT control in the 0 direc­
tion. This will cause the resulting audio frequencies
to sound a little bassy, i.e.high cut filter (high fre­
quencies attenuated).
• LSB/AFSK mode
Interference from lower frequencies can be reduced
or eliminated by rotating the IF SHIFT control in the
0 direction. This will cause the resulting audio fre­
quencies to sound a little bassy, just the opposite
of the effect in the USB mode. Interference from
higher frequencies can be reduced or eliminated by