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I could not find the answer on the forum but I apologize now if it has already been answered.?Noting the need for an improved heatsink/s.?Has anyone done any experiments with increasing the PA voltage? (brown wire) up 24V to see if the output significantly increases. I did this with a BITX40 for a significant increase in W.

Jim

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If you access the list from /g/BITX20/topics instead of an email client you will have access to the search function.? Searching for irf510 24v will yield enough reading to keep you busy for a while.? Best of luck with your experimenting.? Should your quest result in releasing the magic smoke, fear not, a search for irf510 replacement will get you back to good.

HI,
I did this last night with the uBITX, went from 13.8 to 24v. and only saw an increase of +-2w.

80m 24v=12w 13.8v=10w
40m 24v=7w 13.8v=9w
20m 24v=3w 13.8v=4.5w
10m 24v=1w 13.8v=2w

Also cause weird display glitched during TX....
Thoughts?
73 VK4PLN

Very odd, but I am now seeing the same thing on my BitX40v3. On the test bench I was seeing what looked to be an output that increased by the square of the PA voltage ratio, but since packaking, shorter leads, some common grounds, I actually see the same or even less output at 24v than at 12v (or 13.8). I must have some wiring issue, but I did directly jumper the 24v to the PA and saw no difference, so ??

=Vic=

Maybe the bias needs re-adjusting for 24v operation?
I really dont know much about the technical operations of these things, I am still learing...
I am tempted to replace the Electro caps with 35v versions and try maybe 30v in the PA... I have spare IRF510s... lol.
Nick.,