Gautam
I am assuming that you are using the same size VFO inductor and capacitors as
specified by Farhan. If you are using the original design with the 36V zener
diode as a VFO fine tuning capacitor, you might try a different diode. They
do not all show the same capacitance value or range. If this does not work,
it is possible to use other diodes in place of the zener. My BITX20 uses a
Red LED as the tuning diode.
It is possible that you have connected the tuning diode using the wrong
polarity. Try reversing it to see what the results might be.
Since the tuning diode contributes only 10 pf, it can be disconnected
temporarily and the VFO tested without it.
If you do not have a way to measure capacitance, the value of your variable
capacitor can be measured using the simple capacitance test circuit shown in
<>. This
might help to verify that your tuning capacitor is really 365 pf. With the
capacitor completely open it should measure less than 20 pf.
Arv K7HKL
_._
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On Saturday 23 July 2005 09:08 am, ajparent1 wrote:
gautam
