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4.
Zero adjustment of S meter
(1)
(2)
(3)
Purpose:
To
make
a zero adjustment
of the S meter's
pointer, mechanically.
No measuring instrument is necessary.
Adjusting procedures
1)
Connect
the
AGC
terminal
X48-0012-00 to GND.
2)
Adjust the pointer to the zero point of tp by
means
of ZERO
ADJ
(VR1)
in the unit
X48-0012-00.
[Note]
Adjust precisely to ''0"' since the pointer deviates
little toward
the
negative
direction
due
to a
diode.
3)
Disconnect the AGC terminal from GND.
4)
Ascertain that the meter pointer remains at a
standstill even
if the MODE
switch
is set to
various different positions.
5)
Ascertain
that the pointer is deflected up to
its full scale when the RF GAIN
VR (VR2 in
the front panel) is turned counterclockwise to
the end.
After this, it must be turned back to
its initial position.
of
the
unit
Ripple
shall
be
less than 2dB
Lo
Fig. 8
5. Carrier oscillator (Refer to Fig. 9)
24
(1)
(2)
(3)
Purpose:
To adjust the frequency of the carrier oscillator
and to tune the output coil.
Measuring instruments:
1)
RF
vacuum
tube voltmeter
or detector and
voltmeter.
2)
Frequency counter
Adjusting procedures:
1)
Connect the RF vacuum tube voltmeter to the
OUT
terminalis
in
the
carrier
unit
X50-0009-00.
2)
Adjust the output coil Ti to obtain maximum
output.
3)
Disconnect vacuum
tube voltmeter.
Connect
the frequency counter to the OUT terminal to
make observation possible.
4)
Match
the frequency by adjusting the TC1 ~
3 in accordance with Table 3.
TC3
OUT
Tl
ow
O
os
o
a
o
rey
x
TCl
TC2
G
Fig. 9
Mode SW. | Receiving
Adjust | Transmitting | Adjust
USB
3.3965 MHz}
TC2
| 3.8975 MHz
-
LSB
3.3935 MHz}
TCa
| 3.3935 MHz
_
CW
3.3935 MHz
—
3.3943 MHz}
TCi
Table 3
6. Coil pack
(1) Purpose:
(2)
(3)
To complete the RF tuning of an antenna in the
coil pack.
Measuring instruments:
1)
Oscilloscope
2)
AF vacuum tube voltmeter
Adjusting procedures:
1)
Connect the oscilloscope and the AF vacuum-
tube voltmeter to a dummy load of 8 ohms in
the PHONES
terminal, thereby making obser-
vation possible.
2)
Set the AGC/CAL switch to 25kHz.
3)
Set
the drive
knob
on
the
panel
to the
position of '12 o'clock''.
in this case, there
should be no deviation of the knob
at both
sides.
4)
Adjust
the
coil
packs
X44-0028-00
and
X44-0027-00 in accordance with Table 4.
{Note 1] Adjustment
may
be impossibie
if the adjusting
bands are not handled in correct order.
Tune
the 3.5MHz
Li (X44-0028-00)
core on
the innermost
side and the other cores on the
outermost side.
[Note 2] Be careful not to destroy cares.
If there is any
care that fails to rotate smoothly, inject white
powder
(Acro-wax)
and
make
sure
that
it
rotates smoothly before adjusting it.
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