Shawn Tayler wrote:
>
> Hi,
>
> I've been following the discussion of tetrode amplifiers with great interest.
> A friend of mine, Dave WA6MNM, is trying to get a 4CX1000A
> going on 6M. It all started with a 4-1000 which appeared to be rather
> touchy. He then changed over to the metal tube and is having a very
> similar problem.
>
> After careful testing we've found that the TS-60 radio that he's been using
> as an exciter has the nasty habit of putting out a very high power
> pulse of RF when the PTT is activated, especially when a lower output
> selection has been made. It doesn't occur everytime but every 3rd or
> 4th time is quite repeatable.
>
> Has anyone on here run across this problem in the past and if so is there any
> information/suggestions as to how to tame this little problem?
Yes. I have a friend with a Yaesu 890 and he complains about that. Every
890 that he has tested does that with lower than full power. Someone on
the net said that it is a general problem with a lot of rigs. I asked
the question on the Yaesu net but got no answers.
Charles (Jack) Hawley Jr.
Amateur Radio: Chuck, KE9UW
BMW Motorcycles: Jack, BMWMOA #224
c-hawley@uiuc.edu
Sr. Research Engineer Emeritus
University of Illinois, Urbana-Champaign
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