开云体育

Mad,

Thousands of stock uBit's are operating with no trouble at all.
If the IRF510's die at all, It is almost certainly because of overheating.
Perhaps when running some digital mode, inside an enclosure, with zero airflow..

Many of the reports of blown IRF510's can be attributed to people fiddling with the gate bias pots
without first spending 10 minutes to figure out what they are doing.?
The "clockwise is minimum" pot rotation plays a big factor.
Going to RD16HHF1's will only make this mistake much more expensive.

The uBitx is designed to be a minimalist SSB rig for all of HF at minimum cost, and succeeds wildly.
If it is to be used continuously at full power in digital modes, the minimalist heatsinks should be improved.

I can imagine that a shorted antenna jack (thus infinite SWR) could play a role.
But only because the IRF510's might heat up after some period of time.

Many in the forum run the IRF510's at around 20 volts for increased power.
With an adequate heatsink, this works reliably.
If you insist on telling them they should switch over to "real" RF devices such as the RD16HHF1,
you should also warn them?not to run at much beyond 12 volts.

The qrp-labs 10W PA blows away the many claims over the years in this forum
that the IRF510's are not suitable as RF transistors.?
It simply works, flat and clean, from 3.5 to 30mhz.
And is bulletproof when operated at 12v, even when presented with a worst case SWR.
The uBitx IRF510's can be just as reliable if given a suitable heatsink.

Jerry, KE7ER