Adjustment Of Receiver Section - Kenwood TS-820 Operating Manual

6.3 ADJUSTMENT OF RECEIVER SECTION
A D J U S T M E N T OF 9V AVR VOLTAGE (AF-AVR U N I T I
Adjust VR4 for 9V between the terminal "9" and chassis.
A D J U S T M E N T O F A G C B I A S ( A F - A V R U N I T )
-
Adlust VR1 for 3 3V between the term~nal "RF1' and the
chass~s
RIT A D J U S T M E N T ( A F - A V R U N I T I
Set the RIT knob to its center position and turn on the RIT
switch. Rotate the main tuning knob until the marker signal
can be heard in suitable beat tone. Then. adjust VR2 so that
the beat tone is not varied regardless of the position of the
RIT switch.
M A R K E R F R E Q U E N C Y C A L I B R A T I O N ( M A R K E R
U N I T I
The marker frequency is factory adjusted prior t o shipment.
However, i f it is deviated after a long period of use of the set.
it must be calibrated accurately. TS-820 is designed to re-
ceive WWV signals so that the marker frequency can be cali-
brated prectsely.
Set the B A N D switch on the front to W W V and turn the
main tuning knob until i t is aligned with the "0" on the sub
dial. A standard 1 5 MHz W W V beat signal will be received.
By setting the FUNCTION switch to CAL-25 kHz, this beat
signal is superposed on the marker beat signal and is heard
as a double beat signal. Adjust the ceramic, trimmer TC1 un-
til a zero beat is obtained. The marker frequency is n o w fully
calibrated.
COUNTER FREQUENCY C A L I B R A T I O N
1
(COUNTER UNIT, OPTION)
*
W i t h the FUNCTION switch i n the VFO position. turn the
BAND switch to receive
15
MHz W W V standard signal. By
connecting the counter calibration cable suppled to the
counter unit and the X VERTER IN jack on the rear panel. the
W W V beat signal is superposed on the higher harmonics of
the standard signal of the counter and is heard as a double
beat signal. Adjust the trimmer of the counter unit to obtain
a zero beat. By so doing, the frequency indicated on the di-
gital display is accurately calibrated. After the calibration.
disconnect the counter calibration cable.
Set the FUNCTION switch to CAL-25 kHz t o receive a
marker signal. Make certain thattheANTterminalsareshorted
ted w i t h a 5 0
-
7551 resistor. W i t h the DRIVE knob set to
its center position. adjust the ANT and MIX coils for maxi-
mum deflection of the S meter. using the frequency table gi-
ven below. I n adjustment, start w i t h the
1
8 MHz band and
then proceed to other bands. To adjust the 10m band, use
only 29.0 MHz i n the 2 9 . 0 MHz band.
Adjustment
1 1 I
I 1
Freouencv
ANT Coil MIX Coil DRIVE coil
/
2
1.8
1
1.90
M H Z
L 8
1
L 2
1
L15
1
3.5
7
1 4
A D J U S T M E N T O F RECEIVE I F COIL
(RF A N D IF UNITS1
2 9 . 0
W W V
Receive 2 5 kHz marker signal using any frequency. Adjust
the DRIVE knob and the main tuning khob for maximum def-
lection of the S meter. Then adjust T2 of the RF unit and T4.
T5 and T7 of the IF unit until the S meter indicates maxi-
mum deflection. D o not touch T I . T2. T3 and 1 6 .
3 . 7 5 MHz
7 . 1 5 MHz
14.175 MHz
S METER A D J U S T M E N T (IF U N I T I
2 1
I
21.225 M H z L13
29.00 M H z
1 5 . 0 0 MHz
Disconnect the antenna and set the transceiver in receive
mode. The zero-point adjustment of the S meter can now
be acomplished in the following manner:
Adjust V R l so that the meter pointer indicates its minimum
position. I f a standard signal generator (SSG) is available.
adjust VR2 until the S meter indicates "9". using
14.175 MHz 4 0 dB signal (reading on SSG)
L6 L19
LlO,
L1 1
L 1 2
L 1 4
L9 L 1
A D J U S T M E N T OF A N T A N D M I X COILS
(COIL P A C K U N I T )
L16
1
L17
L5 L18
The ANT coil and MIX coil are included in the coil oack unit.