With the transition to from Yahoo to Groups.io I changed an adres. This, the old one, ?kept receiving mails.
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Van:[email protected] [mailto:[email protected]] Namens Richie Chambless Verzonden: donderdag 17 mei 2018 15:47 Aan:[email protected] Onderwerp: Re: [BITX20] Using IRF530 outputs and 2N3553 drivers in ubitx
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I have used the Minipa 70 in my scratch built BitX. While I can get 70 Watts out (13.8v supply), it is short lived as a final will blow within a few seconds and short closed. 50 Watts will work for short QSOs, but taking for more than four or five seconds will destroy the IRF530s. My heat sink is 6¡±x4¡± with 2¡± fins, so I don¡¯t think heat dissipation is the issue. 25 Watts gives me no issues, however.?
