Calibrating The; Rf Gain; Rf Att; Rit - Kenwood TS-820S Instruction Manual

scale and the digital display. the correct frequency is on the
digital display In this case. the analog dial should be ca-
librated with the calibrate knob.
cw
Set the IF SHIFT knob to its center position. If CW filter is
not used, obtain a zero beat point of marker signal and turn
the main tuning knob counter-clockwise until a beat signal
of about 800 Hz is received. While holding the main tuning
knob, turn the dial calibrate knob so that the dial pointer in-
dicates the correct position on the dial.
NOTE: When the digital display is used, the digits for
10 MHz order change according to the BAND switch and
are independent of the counter unit. In the 295 MHz band,
for example, the indication "29.9999" is followed by
,. 200000"
When CW filter is used. turn the dial when the marker signal
casues maximum deflection on the S meter and then cali-
brate using the dial pointer. In this case. the beat frequency
is about 800 Hz (CW filter YG-88C is optional extra)
CALIBRATING THE FIXED CHANNEL AND
VFO FREQUENCIES
Fixed channel and VFO frequencies can be calibrated at the
CAL-FIX position of the FUNCTION switch. Set the switch
to the CAL-FIX position and turn the VFO main tuning knob
until a beat signal is received in the vicinity of fixed channel
frequency. Calibration is effected at the zero beat position
CALIBRATING THE TS-820S WITH VFO-820
Turn the FUNCTION switch to CAL-RMT to cal!brate the
T5-8205 with the VFO-820. a receiver. or another remote
VFO Tune the remote VFO to the frequency selected on the
T5-8205 and zero beat the generated marker signal. At zero
beat. the T5-8205 and remote VFO frequencies coincide.
By calibrating the TS-820S for normal operation. as
described previously. the TS-820S can be used as a
frequency standard for calibrating the remote VFO.
4.4 CALIBRATING THE FREQUENCIES
4.5 RF GAIN
To read frequencies correctly from the dial scale. the dial
must be calibrated previously using a 25 kHz marker. To ca-
librate. set the FUNCTION switch to CAL-25 kHz and the
AIT switch to OFF. Turning the AF ATT switch to ON redu-
ces the incoming signal and the marker signal can be recei-
ved more easily Detailed method of calibration is described
below.
RF GAIN is controlled by changing the voltage of the AGC
circuit Adjust the RF GAIN knob so that the S meter does
not cause excessive deflection This minimizes the noise du-
ring reception and allows the S meter to indicate the correct
signal strength. For normal operation. this knob should be
turned fully clockwise for maximum sensitivity
sse
4.6 RF ATT
Set the MODE switch to use or LSe Marker signals are re-
ceived at every 25 kHz so accurate calibration is possible
over the entire range of the dial.
If the transceiver is operated in a short-distance (within
several hundred meters) and strong signals of nearby fre-
quencies are received. the wanted signals are blocked. Also.
if the wanted signals are very strong. the S meter is scaled
out In this instance. set the ATT switch to ON. The input
signals to the RF amplifier are attenuated by about 20 dB.
providing distortionless reception
4.7 RIT
By using the RIT knob, the receive frequency of VFO can be
shifted by about :t3 kHz and the frequency of fixed channel
by about :t 150 Hz without changing the transmit fre-
quency If the frequency of the opposite station is deviated.
your receive frequency can be set to the station by turning
the AIT switch to ON and using the AIT knob. The state of
With the transceiver set to your desired band, turn the main
tuning knob so that a beat signal can be received at every
25 kHz. Turning this knob further will cause the beat signal
to vary from high to low tone and finally become a zero
beat Accurate zero beat point is obtained by turning the IF
SHIFT knob in the "-" direction (for USe), and in the "+"
direction (for LSB). Stop turning the knob at the zero beat
point and rotate the dial calibrate knob alone while holding
the main tuning knob until the dial pointer indicates 0, 25,
50 or 75 on the dial.
The dial calibrate knob is forced against the main tuning
knob by means of a spring permit slip ro!ation with ease.
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