Conar 500 Manuale per il funzionamento e la manutenzione - Pagina 12

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former from the bottom, turning the bottom siug counterclockwise will move the slug
teward the bottom of the transformer, which will reduce the inductance of the bottom
coil,
and
therefore
raise
the
resonant
frequency
of this part
of the
transformer.
LF ALIGNMENT-—METHOD |
VOLUME/OFF
Fully clockwise
BFO
AM
BAND
15 meters
TUNING DIAL
22 MHz
GAIN
Fuliy clockwise
2. Disconnect
the antenna
and connect
the signal generator
to pin
| of the 6BE6
converter
Vi
(see
Fig.
6 and
Fig. 9.)
Adjust
the signal
generator
to 455
kHz,
modulated with a 400 Hertz audio tone.
3. Carefully
adjust
the
top slug of T4 (see Fig. 5) for maximum
audio output.
If
necessary, reduce the output of the signal generator for a comfortable sound level.
4. Next adjust the bottom slug of T4 for maximum output. Continue by adjusting T3
top, T3 bottom, T2 top, and T2 bottom, Reduce the generator output as necessary to
keep the audio output to a reasonable jevel as you proceed with the alignment.
5. Repeat Steps 3 and 4 for final peaking of the i-f transformers.
LF ALIGNMENT-METHOD 2
\. Set the controls as for Method |.
2. Connect the signal generator to pin I of VI as before, but set the signal generator to
455 kHz unmodulated.
3. Set the vivm to read —de volts on a low range. Connect the probe to the high side of
the volume control Gunction of R15 and R16) and the ground lead to the chassis.
4, Turn
the volume
control down
all the way and continue
with
Steps 3, 4, and 5 as
described in Method |, adjusting for maximum deflection of the vtvm.
BFO ALIGNMENT
|. Remove the vivm.
2. Turn the volume control fully clockwise.
3. Turn the bottom slug of T5 three full turns in a counterclockwise direction. Adjust the
top slug of TS to produce an audio tone from the receiver. Now turn the bottom slug
of TS in a clockwise direction to fine-tune the BFO frequency to produce a pleasing
tone.
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