Adju Stment Of Receiver Section - Kenwood TS-820 Operating Manual
Ssb transceiver
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Also See for TS-820:
- Service manual (109 pages) ,
- Operating manual (44 pages) ,
- Manual (11 pages)
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6 .3
A DJU STMENT
O
F RE CEIVER
S
ECTI ON
ADJUST
M EN
T
OF 9V AVR VOLTAGE
(AF-AVR
UNIT)
Adjust VR4
for
9V
between
the
terminal
"9" and
chassis.
ADJ
U ST MENT
OF AGC B IAS (AF·AVR UN IT}
Adjust VR 1 for
3.3V between
the terminal
''RF1''
and the
chassis.
RIT ADJUS TMENT
{A
F-AVR UN IT)
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.
MARKER
FREQUENCY CA
LIB RATI
ON
(MARKER
U NIT}
The marker frequency
is factory
adjusted prior to shipment.
However.
if
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
precisely.
Set the BAND
switch on the
front
to
WWV
and turn
t
he
main tuning
knob
until
it is
aligned
with the
"0"
on the sub
diaL
A
standard
15 MHz
WWV
beat
signal
will be received.
By setting the
FUNCTION
switch to
CA
L-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
now fully
calibrated.
COU
NTER FREQUENCY CA
LI
BRATION
(COUNTER
U
N
IT.
OPTION}
With
the FUNCTION
switch
in the
VFO
position.
turn the
BAND
switch to rece
ive
15
M Hz
WWV standard signal.
By
connecting the counter calibration
cable
suppled
to the
counter
unit
and
the
X
VE
RTER
IN
jack on the
re
ar panel.
the
WWV 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.
ADJUSTMENT
OF
AN
T
AN
D
M IX CO ILS
(COI
L PACK
U
N IT)
The
ANT coif and
M IX
coil are
included in
the
coil
pack
unit.
38
Set the FUNCTION switch to CAL-25
kHz
to
receive a
marker
signal.
Make
certain that
the
ANT
terminals
are shorted
ted
w ith
a 50
""'
7511
resistor.
With 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.
In
adjustment.
start with
the
1.8
MHz
band
and
then proceed
to other bands. To
adjust the 1Om
band.
use
only
29.0
MHz in the 29.0
MHz
band.
BAND
Adjustment
ANT Coil
MIX
Coil
Frequency
18
1.90 MHz
L8
L2
3
.5
3
.75
MHz
L
10.
L3
7
7.
15
MHz
L11
L4
14
14.
175
MHz
L12
L5
21
21.225
MHz
L13
L6
29 .0
29.00
MHz
L
14
L7
wwv
15.00
MHz
L9
L1
ADJUSTME
NT
OF
RECEIV
E IF
CO
IL
{R
F
AND
IF
UN ITS)
DRIVE
coif
L15
L16
L17
L18
Ll9
L20
Receive 25 kHz
marker
signa
l
using .any
frequency.
Adjust
the
DRIVE
knob and
the
main
tuning
knob
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.
Do
not
touch
Tl.
T2.
T3 and
T6.
S METER ADJUSTM ENT
(IF
UN IT)
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 VR 1 so
that the meter pointer
indicates
its minimum
position.
If
a standard
signal
generator (SSG)
is
available.
adjust
VR2 until the S meter
indicates "9", using
14.
17
5 MHz
40
dB
signal
{reading on SSG)
~
I
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