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TRANSISTER ADJUSTMENT
TRANSMITTED FREQUENCY ADJUSTMENT
1. Connect a frequency counter through a 47 k-ohm resistor to
the emitter of Transistor Q2 as illustrated.
Frequency Counter
570 Hz (+3 Hz)
4. Adjust the potentiometer (P3) to obtain 38 kHz (+0.2 kHz)
on
the frequency
counter.
Then,
turn
the core
of the
transformer
(T1)
until
the
wave
form
becomes
the
maximum
at peak-to-peak (50 — 55 V) on the synchroscope
(Volt. Range: 10V/cm.).
5. Check
to see that the frequency
counter
reads 38 kHz
(£0.2 kHz).
*
If not, repeat the adjustment in Item 3 until the specified
value is obtained.
6. Connect
the synchroscope
(Volt. Range: 0.2V/cm)
to the
plus side of Capacitor
C6 as illustrated. Then, adjust the
potentiometer (P2) until the synchroscope reading becomes
1 V at peak-to-peak.
Synchroscope §
1V
'
—16—
2. Turn
the potentiometer
(P2) fully counter-clockwise
and
adjust
the
potentiometer
(P1)
by turning
it until
the
oscillation
frequency
becomes
570Hz
(+3Hz)
on
the
frequency counter.
3. Connect the frequency counter through a 47 k-ohm resistor
and a synchroscope to the transmitter output as illustrated.
Synchroscope
50 — 55V
Frequency Counter
38 kHz (40.2 kHz)
Resistor
) (47 k-ohm)
Output
eid
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Cc
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