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ALIGNMENT
Maximum performance can only be
obtained
If extreme care
is exercised during alignment.
Follow the procedure carefully.
A low range output meter should be connected
across the speaker voice coll.
Set receiver volume
control to maximum; for greatest accuracy keep out¬
put of receiver at approximately .05 watt throughout
alignment by reducing generator output (not receiver
volume control) as stages are brought Into align¬
ment.
(.05 watt =
.40
volt on output meter).
The
alignment tool should be of an Insulated type such
as Motorola Part Number 66A71008*
If receiver is operated from AC line during
alignment,
it Is suggested that an Isolating trans¬
former be used between rece Tver and power line.
If
no Isolation transformer is used and hum Is encoun¬
tered during alignment, connect the ground side of
the signal generator to B- instead of the receiver
chassis.
Refer to Figure i for location of all adjust¬
ments.
STEP
DIAL
SET
TO
DUMMY
SIGNAL
GENERATOR
CONNECTED TO
SIGNAL
GENERATOR
SET TO
ADJUST
TRIMMER
OR CORE
REMARKS
IF AI
1.
.IGNMENT
Gang fully
opened
• 1 mf.
Osc-Mod grid *
455 KC
1,2,3 & 4
Adjust for
maximum
RF AI
2.
.IGNMENT
1600 Kc **
-
Radiation
loop ***
1600 KC
5
This sets osc.
to dial scale
3.
1400 Kc
""
Radiation
loop ***
1400 KC
6
Tune signal for
max. with re¬
ceiver tuning
knob, then peak
trimmer g.
*
A convenient point Is the stator of the antenna section of the tuning capacitor.
**
Close gang fully and set pointer to calibration mark at left hand side of dial background; then set
pointer to 1600 Kc by turning tuning knob till pointer lines up with right hand calibration mark.
***
Connect output of signal generator to a
5
" diameter,
3
turn loop and bring loop close enough to
receiver loop to obtain output of
50
milliwatts (.40V), on output meter.
Vary distance between loops
to maintain this output during alignment.
Minimum distance between loops should never be less than
12
".
FIGURE |.
TUBE AND TRIMMER LOCATIONS
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