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DT-12HS/HR/HB/HY/BL
DT-12ES/ER/EB/EY
GENERAL
ALIGNMENT
INSTRUCTION
Should
it become
necessary
at any time to check the adjust-
ment of this receiver, proceed as follows;
1. Set the volume control (VR103) to maximum.
2. Attenuate the signals from the generator enough to swing
the most sensitive range of the output meter.
3. Use a non-metallic adjustment tool.
4. Repeat adjustments to insure good results.
5. Set the Function
Selector Switch
(SW101)
to "RADIO"
position.
AM
IF/RF
ADJUSTMENT
@
Set the signal generator to produce a signal of 400Hz, 30%,
AM modulated.
© For adjustments in steps 4 and 9, see [Note A].
DIAL
|ADJUST-
IF (Connect instruments as shown in Fig. 10—1.)
455kHz!
High
Adjust for
best "IF"
curve.
RF (Connect instruments as shown in Fig. 10—2.)
LW
Band
i
cover-
age
i
3
LW
Adjust for
i
maximum
output.
Repeat steps 2, 3, 4 and 5 until no further improvement
can be made.
Adjust for
maximum
output.
Repeat steps 7,8, 9 and 10 until no further improvement
can be made.
Adjust for
maximum
output.
Repeat steps 12, 13, 14 and 15 until no further improve-
ment can be made.
Check the alignment of the receiver antenna coil by
bringing a piece of ferrite (such as a coil slug) near the antenna
loop stick, then a piece of brass. If ferrite increases output,
loop requires more inductance.
If brass increases output, loop
requires less inductance. Change loop inductance by sliding the
bobbin toward the center of ferrite core to increase inductance,
or away to decrease inductance.
SWEEP
GENERATOR
SIGNAL
GENERATOR
SIGNAL
GENERATOR
=10=
oe
Oscl
MW/LW
CILLOSCOPE
CURVE
TEST LOOP BAR ANTENNA
i
fo
Figure 10-1
ELECTRONIC
Naini
VOLTMETER
TEST LOOP
BAR ANTENNA
!C3
Figure
10—2
I-—— To Telescopic Rod Antenna
c
£
R = 300hm
z
50 ohm <=
opr
Z: Output impedance of signal generator
To chassis GND
ELECTRONIC
VOLTMETER
R
Telescopic Rod
Antenna
!C3
/
OPin
Figure 10—4 ADJUSTMENT
POINT
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