Kenwood TS-820 manual Calibrating T H E Frequencies, RF G a l N

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 dig~tsfor 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 "29999 . 9" is followed by "20000 . 0" .

Dial Reading 177 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

4.4CALIBRATING T H E FREQUENCIES

To read frequenc~escorrectly 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 1s possible over the entlre range of the dlal

Wlth 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 " - "direction ifor USBI. and in 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. 50 or 7 5 on the dial.

The dial cal~brateknob 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 800 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~lteris 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].

CALIBRATING THE FIXED CHANNEL A N D VFO FRECIUENCIES

Flxed Channel and VFO frequencies can be calibrated at the CAL~FIXposition of the FUNCTION switch. Set the switch to the CAL~FIXposition and turn the VFO main tuning knob u n t ~al beat signal is received in the vicinity of f~xedchanne! frequency. Calibration is effected at the zero beat pos~tion.

CALIBRATING THE T S - 8 2 0 W I T H VFO-820

Turn the FUNCTION switch to CAL-RMT to calibrate [ h i TS - 820 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 0and zero beat the generated marker signal. At 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.

4.5RF G A l N

RF GAlN is controlled by changing the voltage of the AGC c~rcu'itAdjust. the RF'GAINknob 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.