Reception (Il) - Kenwood TS-530SP Instruction Manual

: Receive Interfering Receive
Interfering signal signal attenuated —_ signal
signal i by NOTCH
Audio output Audio output
(NOTCH OFF) (NOTCH ON)
Fig. 4-3 Notch Control
(2) RF ATT SWITCH
The input to the receive RF amplifier is attenuated approxi-
mately 20 dB, providing distortion-free reception. This
feature may be used in cases of receiver overload, caused
either by a strong local signal, or during weak signal recep-
tion when a strong adjacent signal may blank the receiver
or pump the noise blanker.
(3) RF GAIN CONTROL
RF GAIN is controlled by changing the AGC threshold vol-
tage. Adjust the RF GAIN so the S-meter does not deflect
excessively. This also reduces noise during reception. For
normal operation, this control should be turned fully clock-
wise for maximum sensitivity.
Maximum "S" meter reading
of an incoming signal.
RF GAIN
4
er)
°o 10
Full
; clockwise
Signals weaker
Pointer deflection with
péaition
than this level RF gain control adjusted
are attenuated.
Counterclockwise.
RF GAIN
4
€ ES} ,
°o 610
Turn
counter-
Fig. 4-4 RF GAIN Control Operation clockwise
(4) AGC (AUTOMATIC GAIN CONTROL)
Set the AGC switch to the appropriate position: Generally
for SSB, SLOW, for CW FAST, and for very weak signals,
the AGC may be turned OFF.
Simultaneous Use of the RF GAIN CONTROL and AGC
Switch
If a strong signal (such as a local station) appears in the
vicinity of the intended receive signal, the S meter may
show unusual deflection due to the AGC voltage deve-
loped from the strong disturbing signal. If this occurs, turn
the RF GAIN down so the meter pointer remains at about
the original deflection peak and turn the AGC switch OFF.
This will eliminate the unwanted AGC voltage and permit
clear reception.
(5) RIT/XIT
First set the RIT/XIT control to center, and turn the RIT
switch ON.
The RIT/XIT control allows shifting the receive frequency
by approximately +2 kHz without changing the transmit
frequency.
With the RIT switch ON, the receive frequency can be
adjusted by using the RIT control.
With both the RIT and XIT switches ON, both the transmit
and receive frequencies can be shifted.
For XIT switch operation, refer to Section 4.4 "Transmis-
sion (Il)".
NOTE:
When the RIT is ON, transmit frequency is different from
the receive frequency. For normal operation, leave the RIT
switch OFF. It should be turned ON only when needed.
(6) IF SHIFT
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 superimposed on nearby signals
during operation in both SSB or CW mode.
Turned in Odirection Turned in@direction
IF filter passband
Rn) characteristic ep
Interfering signal
Interfering signal
IF SHIFT IF SHIFT IF SHIFT
Turn indirection to
eliminate interference
from signal B.
Turn in@direction to
eliminate interference
from signal A.
Fig. 4-5 IF SHIFT CONTROL
15