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Teathect
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29
DAYSTROM
( } Connect
the positive
or 'hot' lead of the signal generator te the AE terminal on rear of chassis
and earth lead
to E,
If convenient this connection may be made
co-axially to the co-awx input socket,
{ } Turn all the equipment
on and let it warm
up for approximately
30 minutes
to stabilise
all circuits.
{ ) Switch
the AC
meter
to a range between
| and 3 volts and set the generator for a modulated high output level.
The output
of the
generator
should be reduced
as the alignment
procedure
i increases
the sensitivity
of the re-
ceiver,
to keep the meter
readings
at approximately | volt.
~
( )} Unscrew
core
of L19 four turns.
— —
Start alignment of the IF transformers
by adjusting the signal generator to approximately
1621 Ke/s for maxi-
mum
indication on the meter.
The generator
reading at this time may be slightly above or below
1621 Ke/s IF
frequency.
( }) Adjust the bottom slug of the transformer
IFC for maximum
meter indication.
NOTE;
Cores
used in the trans -
formers
permit
the
alignment
tool
to
pass
through
from
top to bottom
core
thus
enabling
all alignment
to be
carried
out from
the top of the
receiver.
Now
adjust top
core
of IFC for maximum
indication.
Proceed to
transformers
IFB and IFA and make
a similar adjustment.
( } Swing
signal
generator
for
a maximum
meter
indication,
then repeat
the IF transformer adjustment as in the
preceding
step.
(Two
peaks
may
be
observed indicating
each crpatal resonance.
Set generator to mid-point
P
5
P-
4
P
¥
6
¥
&
B
for final alignment. }
( ) Repeat
the
entire
procedure
as
in the
above two steps until further adjustment does not cause
an increase in
meter
reading.
—
| 2
Lad
He
wt
x
ci)
io
is}
o
oh
5
a"
oO
ae
a"
a
ct a
far)
a
re
ee]
2
m jae > a
2
3
ft =) a
+
5
7
+ a
ie
'
eI
a
a
—
et)
a
I
o
a]
o Fay
m
=
ib oo
2 ®
snerator on with high level output.
ust
core o
or minimum
meter
reading.
Adjust
f£L19f
ini
t
di
{ } This completes the alignment of the IF stages in your receiver.
Disconnect the test equipment.
FRONT
END ALIGNMENT
In order
to obtain
optimum
results
from the receiver,
the coil pack should be aligned with an accurate amplitude
modulated RF signal generator and anAC voltmeter.
It is very important that the signal generator be very accurate.
( ) Set all panei controls as follows: -
AF
GAIN
Maximum
RF GAIN
Maximum
BFO mode
Oo
TUNING
As chart
BAND
As chart
BFO
Off
NL
MIN
AVC
OFF
CAL ADI
12 o'clock
ANT
TRIM
1Z o'clock
{ } Connect the RF signal generater to the antenna terminals
or co-axial
socket
BLQOUCESTER
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