[AMPS] 4CX1000A on 50Mhz

[Chuck (Jack) Hawley]

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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