nt: Tue, 6 Jul 1999 14:59:01 -0700
> I have used the Ameritron QSK in a Heathkit SB-1000. The only drawback
> that I had found is that the MOS FET would short. This happened on way to
> many occasions.
You probably had a tube that was faulting. You can improve
immunity to this problem by putting a 50 volt MOV from each side
of the filament winding at the filament choke to ground.
> What about using the QSK-5 or RTTY contesting at 1500 watts output with a
> L O N G cq. What about RTTY rag chewing at 1000- 1300 watts out for 10
> minuets ?
Shouldn't be a problem at all. The bulk of failures are caused by
timing problem during switching transition periods. There are
commercial FM systems using them at 2500 watts in a packet-like
mode at HF, with long duty cycle.
73, Tom W8JI
w8ji@contesting.com
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