The imput impedance of the IRF510 is very low. Therefore I made the
coil trifilar resulting in a lower impedance then originally. This
gives more output but seems also give a better stability?
I remember I have a low iddle current, (30 mA?) to have it stable.
Higher iddle current brought not much benefits, the output increased
slightly but not worth the additional heat up. Modulation is fine,
several SSB contacts made with good result.
Good luck, Chris.
hi all,
looks like the instability problem has something to do with the
phase
of the input to the IRF510 too.
can those who have tried the trifilar windings also suggest the
phase
used in the transformer?
- farhan
--- In BITX20@..., "Ruud Jongeling" <pe2bs@t...> wrote:
Hi Ron,
I just read your message. There is something in the message I
recognize: 'Found that the IRF510 has a tendency to start
oscillating
when set at a higher bias-level.' I had that problem too. In
mine
BITX-PSK it was not enough to lower the bias-level.
