Re: Higher voltage for Bitx40 Final
11.5v should be fine, make sure it is still 11.5 when PTT is pressed.toggle quoted messageShow quoted text
Quiescent IRF510 drain current changing somewhat as they get warm is normal
The drop from 6w to 4w when V+ to the IRF510's is bumped from 12v to 24v is very weird.
Have you tried simply switching the IRF510 V+ between the two with exactly the same setup, same instrumentation?
Hate to say it, but my first guess would be pilot error.
On Sun, Feb 4, 2018 at 01:10 pm, Vic WA4THR wrote:
Just finished building my BitX40 after playing with the circuit for a few weeks. Early tests on mine suggested that using the small booster I have and raising the PA voltage from around 14 to 24 did seem to increase the power by the square of the voltage ratio, so matching these experiences. Admittedly, I was trying to read this on a 450w dummy load meter, and yelling into the mic, s not very accurate. So this past weekend I did get a QRP wattmeter that could read 30w as full scale and get a better idea of how much I am increasing.