[Lf] Field effect versus bipolar transistors]

[Andre' Kesteloot]

Dick Rollema wrote:

> To All from PA0SE Many thanks to those who gave me their views on the
> matter of FETs versus bipolar transistors in LF transmitters. I now
> understand why at unpredictable moments one of the four HEXFETs IRF520
> in my TX fails, though they are operated within their maximum ratings.
> It must be the class B operation for which the FETs were not
> designed. I will turn down the supply voltage down to 30V again at
> which I started on LF. The FETs seemed to accept that over prolonged
> transmission times. 73, Dick, PA0SE
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