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AM
IF/RF ALIGNMENT
TEST | FRE-
STAGE/QUEN-
CY | ING
=)
L
IF (As shown in Figure 20-1, make connection of instrument.)
T
DIAL
SETT-
ADJUST-
MENT
455kHz | High
Adjust for
1
MW | sIF
te or UK\jendof|
T3
| poo yen
68kHz/|
dial
'
curve
oscittoscope
"IF" curve
SWEEP
MW/LW
GENERATOR
TEST
LOOP
BAR
ANTENNA
ED
Fa] owe
L
[ RF (As shown in Figure 20-2, make connection of instrument.)
Low
2
LW
145kHz/end of
L10
Band
dial
Ce
+
cover
T High
3
Lw | 89
/295kHzjend of | TC8
Adjust for
dial
maximum
Te
T
output
170k
4
LW
170kH
L7
Track-
?|_
Hz
5
Lw | "9
270kHz) 270K | tes
=
A
6
Répeat steps 2,3,4 and 5 until no further
improvement
can be made.
RF (As shown in Figure 20-3 make connection of instrument.)
] Low
7
MW | Bang
|510kHz eid 5
L9
cover-
High |
8 | mw | age
| 1850 |endof}
TC7 | Adjust for
dial
maximum
600 | 600
7
output
kHz
kHz
ing
1400 | 1400
Mw
kHz
kHz
| Repeat steps 7,8,9 and 10 until no further improrement
can be made.
s shown in Pour 20-3 make connection of instrument.)
Low
5.85
12
SW
Band
MHz
ae of
L8
ial
cover-
High
age
Min jendof}
TC6 | Adjust for
=
dial
maximum
T
+
65
65
Output
i
L6
Track: | MHz
MHz
|
ing
16
16
Ny
MHz | MHz | 1°?
Repeat steps 12, 13, 14 and 15 until no further impro-
vement 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 inductan-
ce, Or away to decrease inductance.
©
about} |
e
a
10 cm
GND
Figure 20—1
ELECTRONIC
VOLTMETER
SIGNAL
MW/LW
GENERATOR
TEST
LOOP
BAR
ANTENNA
EXT. SP
(J601, J602) |{ A—~
3.20hm
GND
Figure 20-2
t-——>
To Telescopic Rod Antenna
R = 30 ohm
Z = 80 ohm <8
pe
ELECTRONIC
Z: Output impedance of signal generator
VOLTMETER
[x
~20—
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