Chris
My BITX40 uses 24 volts on the IRF510 for a power output of 11 watts. It
required the addition of separate sheilding, 2 ferrite beads on the gate
lead, and a paracitic suppressor (2 ohm 2 watt carbon resistor wound with 4
turns of #16 AWG) between drain and output filter to tame it.
If you have a variable power supply, try bringing the voltage up slowly once
you have it working properly with 12 volts. I did not do this the first time
and it cooked an IRF510! 8-(
My IRF510 is mounted on the heat sink for a computer CPU. The original CPU
fan is mounted on the other side of the heat sink and turns on with the PTT
controlled voltage for the IRF510. I bolted the IRF510 directly to the heat
sink, which is mounted to the chassis via 1/2 inch (1.3 cm) nylon standoffs.
The fan housing is plastic so this isolates it from RF on the heat sink.
Next step might be to replace the IRF510 with push-pull IRF510s or IRF630s and
a 48 volt supply!
Arv K7HKL
_._
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On Wednesday 20 July 2005 03:17 am, vdberghak wrote:
Hi all,
did anyone tried to put higher voltage on the IRF stage?
If so, I am interrested about the results like:
- stability,
- increase of output power.
If the output power is not much higher and other problems will show up,
I will not try it...
Thanks,
Chris.
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