E.
Antenna, RF, and Injection Circuit Aliqnment
1.
2.
3.
4.
5.
6.
7.
Turn off receiver and temporarily connect a
10K
resistor from
the side rotor contact of
S
5 C to ground,and from the corresponding
contact of
S5D
to the nearby terminal strip terminal to which the
red and white striped B+ wire is attached.
S5C
and S5D are the
third and fourth bandswitch waffers as viewed from the front of the
receiver.
You will note that each of these switches have two rotor
contacts . The ones in question are the most easily accessible. All
rotor contacts are green in color.
Disconnect the antenna and connect the 68 ohm resistor across
the antenna jack.
Install the 12.6 mc crystal in one of the R4 accessory sockets for
alignment of the 160 meter band.
Turn the PRESELECTOR fully clockwise and carefully measure the
distance from the top of the white sleeves protruding from the
top of
Tl,
T2,
T3 and T4 to the tops of their respective slugs. This
distance should be exactly
9/16”.
If necessary, adjust the slugs
to this setting.
(This was done at the factory and should be correct.
Check measurements carefully before altering the position of any of
the se slugs
.)
Turn on receiver and tune in the crystal calibrator signal at 28.5 mc.
Set the PRESELECTOR knob so that the slugs are
15/32”
above the
white sleeves.
Adjust all four trimmers marked 28.0 for maximum S-meter reading.
(If the S-meter reading is insufficient to produce an adequate
S-meter indication, it will be necessary to use the
external
signal
generator. Set the generator output level for an S-meter reading
of about S7 and set the generator frequency to 28.5 mc.
Repeat steps 5 and 6 for each band using the slug measurements and
frequencies given in the following chart.
BAND
SLUG HEIGHT
FREQUENCY
28.5
15/32”
28.5 mc
21 .o
7/1
6”
21.3 mc
14.0
1
l/3
2”
14.3 mc
7.0
3/1
6”
7.3 mc
3.5
0 (flush with sleeve)
3.8 mc
1.5
0 (flush with sleeve)
1.9 mc
NOTE that for the 1.5 BAND adjustment the XTAL switch must be in
a position corresponding to the socket in which the 12.6 mc crystal
is inserted.
This completes the alignment. Turn off the receiver and
remove the 10 K and 68 ohm resistors installed in steps 1 and 2.
-34-
(66 pages)
(472 pages)
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