Hello Jim,
Am 07.07.2012 20:55, schrieb James Moritz:
When you replace the existing inductor with a high-Q one, you will
find that the loop gain of the circuit is increased due to the higher
Q, and you will be able to use a lower gain/reduced transistor bias
current.
Give me some days. Soon i will report about the progress. A T50-6 os at
my parents QTH where i will be in some days.
For CW enthusiasts, I am suprised more use is not made of simple LC
VFOs. A drift of +/- 100Hz during the time taken for a QSO is usually
not noticeable,
Oh i would say 100 Hz is a bit hard but 20 Hz should be OK in my opinion.
and it is easy to achieve this in the LF/MF range. Also, the narrow
tuning range means an elaborate tuning mechanism with reduction
gearing is not needed - just a knob with a simple hand-marked scale is
adequate.
EXACTLY!!!!
73, Stefan/DK7FC
It is much simpler than the schemes needed to obtain an LF/MF signal
by dividing/mixing down the output of an HF rig, etc. A VFO is also a
much better practical choice than a crystal oscillator, which leaves
you stuck on a fixed frequency.
Cheers, Jim Moritz
73 de M0BMU
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