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Figure
S-Diagram
of
Top
of
Cluusis
t.F Alignment -
The
intermediate frequency
is
4H
e:The most satisfactory method
of
I· P alignment is
by means of a sweep oscillator and cathode ray
oscillo;
graph. Pollow the sequence
as
given below.
Oaci1Iograph
Connections
..•....................•...•
Vertical
"HI"
to
Terminal C on last I·P Transformer
(L47,
L48), Vertical
"LO"
to chassis
Dummy Antenna
...................................
:
..•.
Insert in series with generator output. 0.01 mfd.
Connection of Generator Output Lead
............••.......•....•....................
" See chart below
Connection
of
Generator Ground Lead
......•.•....•••............•........................
To
chassis
Position of Power·Transmit·Receive Switch
..........•...........................
Position 3 (Rec.
Mod.)
PO$i.Uon
of
R·P Gain Control. . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
Pully clockwise
l1'oeition
of
Selectivity Switch
.........•............•
'
.......................................
Position 2
Position of Noise Limiter and A
VC
Switch
..........
'"
...........................
" Position 4
(AVe)
LOCATION
OF
PARTS
AND
AUGNMENT
ADJUSTMENTS
ON
CHASSIS
Step'
1
Generator Connections
6SG7-lrd
I·P Grid
6SG7 - 2nd
I,P Grid
Trimmer Adjustments
(See Pig.
S')
L47, L48
Trimmer
Punction
4th I·P
Transformer
3rd
I·P Transformer
2nd
I,P Transformer
2
1
4
6SG7 1st I·P Grid
MA7
-1st
Det. Grid
L41,
U2,
U3,
L44
US',
L36,
U7.
U8
L32,
L33
1st I,P Transformer
Before
performing step 4 abo've. set crystal phasi,ng
control
C7S' at approximately one fifth of its maxi·
mum
capacity. This
is
approximately its final setting
and changing it appreciably will slightly detune the
first
I-P transformer.
With
Selectivity Switch in Position 2 the I·P band
width
is
normal without over,coupling in the trans'
formers.
With
Selectivity Switch in Position I, the
second and third I· P Transformers are expanded and
n
over-coupled.
It
is
well
in going through the alignment
steps outlined above to check the I,P curves
on
the
oscillograph screen with switch in Position 1
to
see
that the curves expand symmetrically.
Adjustment of
Crystal Phasing
Control-
This
ad-
justment
is
best made by means of a signal generator
and a high resistance sensitive DC voltmeter such
as
the
RCA
Junior Voltohmyst. Place Selectivity Switch
in Position
3.
Connect the generator to the grid
of
the
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