If Shift; Noise Blanker; Agc - Kenwood TS-820S Instruction Manual

switch to SEND and check that the plate current (IP) is 60
ma. If the plate CUI rent is not correct. adjust the real !Janel
BIAS control for a correct 60 ma of idling current and return
the stand-by switch to REC.
AIT can be checked bh the indicator in the window of the
dial
4.8 IF SHIFT
By using the IF SHIFT knob during reception. the pass band
frequency of the crystal filter can be shifted by about
i 17kHz because of adoption of PLL (Phase Locked Loop)
circuit in the local oscillator circuit This is one of the major
features of TS-B20S and can be used in the following cases:
CAUTION: If the plate current is very much higher than 60
ma do /lOt leave the stand-by switch on for more than a few
seconds Excessive plate current shortens the life of the fi-
nal tubes.
DRIVE TUNING (See Fig 8)
Adjustment of Tonal Quality and Interference Rejection
during SSB Reception.
Shift the METER switch to ALC and the MODE switch to
TUN and peak the ALC reading (maximum meter deflection)
with the DRIVE control The stand-by switch is in the SEND
position for adjustment.
When the transceiver is used in USB mode. turn the IF
SH I FT knob in the ..+.. direction and the lower frequen-
cies are cut out Turning the knob in the ..-" direction
cuts out the higher frequencies (these procedures are
reversed for LSB mode) Adjust the knob so that the to-
;.
-nal quality suits your listening preference The IF SHIFT
knob is also effective in eliminating interference when
the receive signals are superposed on nearby signals
Adjustment of Tonal Quality during CW Operation
NOTE: If there is no ALC reading indicated. increase the
CAR control until there is an ALC reading
PLATE TUNING (See Fig 8)
Turn the METER switch back to IP, leave the MODE switch
at TUN and flip the stand-by switch to SEND Quickly adjust
the PLATE control to dip the plate current (a minimum meter
reading) Return the stand-by switch to REC
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3
NOTE: The TUNE position permits tuning of the finaltilok
circuit at reduced power without danger to the tubes With
the MODE switch io the TUN position, the screen voltage of
the finals is reduced to approximately 50% and the keying
circuit is shorted.
For detailed descriptions, refer to Section 413 "CW
operation",
FSK (ATTY) Operation at 850 Hz Shift
For detailed descriptions, refer to Section 419 "ATTY
operation",
4.9 NOISE BLANKER
The T5-8205 has a sophisticated built-in noise blanker
designed to reduce ingition type impulse noise The noise
blanker IS particularly important for mobile operation. When
necessary. activate the noise blanker circuit by flipping the
NB switch up.
PLATE AND LOAD TUNING
CAUTION: When the MODE switch is in the CW position
the final tubes draw full plate current in transmit Final tube
life is directly related to the length of tune-up periods Do
not transmit with the tubes out of resonance for more than
10 seconds at a time
4.10 AGC (AUTOMATIC GAIN CONTROL)
Set the AGC switch to the position appropriate for the
received signal Generally for SSB reception set the AGC
switch to SLOW. for CW reception set the AGC switch to
FAST. and for reception of a very weak signal the switch
may be set to OFF
Turn the MODE switch to CW. turn the METER switch to RF.
and set the stand-by switch to the SEND position. Quickly
adjust the PLATE control and then the LOAD control alter-
nately to peak (maximum meter lit/flection) the power out.
put. If necessary. adjust the RF VOLT control on the rear pa-
nel to bring the output reading to about a 2/3 scale rrladlng.
4.11 TRANSMITTER TUNING
Connect the T5-8205 to a 50 ohm du mmy load or a 50 ohm
antenna with an 5WR of less than 2 1 before making any
transmitter adjustments. The life of the final tubes is directly
related to the 5WR of the antenna and to the length of tu-
ning periods
NOTE 1: The ALC meter is less deflected at the ON posi-
tIon of the SG switch or at the CW poSition of the MODE
switch than at the OFF position or the TUN position of these
switches This indicates the normal state of RF NFB The
MIC knob and the CAR knob should be properly adjusted un
der normal transmit condItions.
Refer to Table 2 for the initial switch settings of the TS-820S
for transmitting Tune the main tuning knob to the desired
operating frequency
NOTE 2: Transmission is not effet;ted at the WWV or AUX
position of the BAND switch If the transceiver is left in the
transmit mode over a few minutes, the driver tube 12 BY7 A
of the final stage may be dalnaged,
~
PLATE IDLING CURRENT (See Fig. 7)
Turn the main tuning knob to the desired operating fre-
quency within the amateuf band selected Flip the stand-by
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