Calibrating The Frequencies - Kenwood TS-820 Operating Manual

scale and the digital dial (option), the correct frequency is on
the digital dial. In this case. the analog dial should be c a l i ~
brated with the calibrate knob.
NOTE: When the digital display is used, the d i g ~ t s for
10 MHz order change according to the BAND switch and
are independent of the counter unit. In the 29.5 MHz band.
for example. the indication " 2 9 9 9 9 . 9 " is followed by
" 2 0 0 0 0 . 0 " .
Dial Reading
1 7 7 kHz
The operating frequency of the
transceiver
is the sum of the band
1rrqurncy and dial reading frequency
1
Crample Band switch
14
MHz
Ollerartng Frequency
14000
+
177
=
14177
kHz
Fig. 6 Reading the Operating Frequency
4.4 C A L I B R A T I N G T H E FREQUENCIES
To read frequenc~es correctly from the dial scale. the dial
must be calibrated previously using a 2 5 kHz marker. To ca-
librate, set the FUNCTION switch t o CAL-25 kHz and the
RIT switch to OFF Turning the RF ATT switch t o ON redw
ces the incoming signal and the marker signal can be recei-
ved more easily. Detailed method of calibration is described
below.
SSB
Set the MODE swltch to USB or LSB Markersvgnals are re-
celved at every 2 5 kHz so accurate callbratlon 1 s possible
over the entlre range of the dlal
W l t h the lranscelver set t o your desired band. turn the main
tunlng knob so that a beat signal can be received at every
2 5 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 knoll in the " - " d i r e c t i o n ifor USBI. and i n the
" I - "
direction (for LSB). Stop turning the knob at the zero beai
point and rotate the dial calibrate knob alone while holdlng
the main tuning knob until the dial pclnter indicates 0. 25.
5 0 or 7 5 on the dial.
The dial cal~brate knob is forced against the main tunlng
knob by means of a spring permit slip rotation with ease.
Set the IF SHIFT knob to its center position. If CW filter i s
not used. obtain a zero beat point of marker slgnal and turn
the main tuning knob
counter-clockwise until a beat signa!
of about 8 0 0 Hz is received. While holding the main tuning
knob. turn the dial calibrate knob so .that the dial pointer in^
dicates the colrect position on the dial.
When CW f ~ l t e r is used. turn the dlal 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 8 0 0 Hz (CW ftlter Y G 8 8 C is optional extra].
C A L I B R A T I N G THE FIXED C H A N N E L A N D
VFO FRECIUENCIES
Flxed Channel and VFO frequencies can be calibrated at the
C A L ~ F I X position of the FUNCTION switch. Set the switch
to the C A L ~ F I X position and turn the VFO main tuning knob
u n t ~ l a beat signal is received in the vicinity o f f ~ x e d channe!
frequency. Calibration is effected at the zero beat pos~tion.
C A L I B R A T I N G THE T S - 8 2 0 W I T H VFO-820
Turn the FUNCTION switch to CAL-RMT to calibrate [ h i
T S - 8 2 0 with the VFO-820, a receiver. or another remotr
VFO. Tune the remote VFO to the frequency selected on t h ~
7 5 ~ 8 2 0 and zero beat the generated marker signal. A t zerc
beat. the TS-820 and remote VFO frequencies coincide.
By calibrating the TS-820 for normal operation. as describe;
previously, the TS-820 can be used as a frequency standarci
for calibrating the remote VFO.
4.5 RF G A l N
RF GAlN is controlled by changing the voltage of the AGC
c~rcu'it. Adjust the RF'GAIN knob so that the S meter doe:
not cause
excessive
deflection. This minimizes the noise du
ring reception and allows the S meter to indicate the correc!
signal strength. For normal operation. this knob should be
turned fully clockwise for maximum sensitivity.