C. Crystal Filter and Filter Match Transformer Aliqnment
1.
2.
3.
4.
5.
6.
7.
8.
9.
Attach signal generator to pin
#l
of V2 and set generator frequency
to 5645 KC.
Set level so that an S-Meter reading of approximately S-9 is obtained.
Set
Passband
selector switch to 2.4 KC and set
Passband
knob until
it points horizontally to the left.
Adjust signal generator frequency for peak S-Meter reading. A high
pitched audio tone should be audible from the speaker.
Adjust generator frequency so that the tone increases in pitch. You
will notice that the S-Meter reading will start to drop. Continue
shifting the generator frequency until the S- Meter reading drops 20
DB. (If the meter reads S-9 at peak, it should now read S-5).
Adjust T5 and T6 for maximum S-Meter reading.
Return
Passband
selector lever to 4.8 and return
Passband
knob to
center of longest line.
Set generator frequency to image frequency at 5545 KC and adjust
generator output level until a signal is heard from the speaker.
Note the wires wrapped around pins on the base of the crystal filter
can
(T6).
Unwrap one of these wires until minimum signal strength
is obtained. (Note:
Unwrapping the wrong wire will result in an
increase rather than a decrease in this signal). If much adjustment
is necessary here,steps 1 through 6 should be repeated.
D.
5 59 5 KC 0 scilla tor Aliqnment
1.
2.
3.
4.
5.
6.
Return
Passband
selector lever to 4.8 KC and
Passband
tuning knob
to the center of the longest line.
With signal generator still attached to pin 1 of V2, and VTVM still
attached to TP-1, adjust the generator frequency for maximum positive
voltage.
This frequency should be very near 5645 KC.
Observe this peak voltage and tune the generator in either direction
from the point until the voltage drops 50%. Observe the generator
frequency reading at this point.
Now tune the generator in the opposite direction until the voltage is
once again 50% of peak and observe the frequency.
Set the generator exactly half way between these two points and
adjust C61 for zero beat from the speaker.
Disconnect generator and VTVM.
NOTE:
If
R4A
is to be used with T4 or
T4X,
a more accurate adjustment of
C61
will be
required.See
T4/T4X
instruction book.
-33-
(66 pages)
(472 pages)
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