But what does it tell you?
73
Gary K4FMX
Mark Marsden wrote:
> Hi Randall
>
> Have a look at
> http://granta.digital-crocus.com/Linear_Design_notes/Spectral_regrowth.jpg
>
> That's a screenshot of the transmit spectrum of my 4CX1000A linear, (Va
> 2750V, Vs 350V, ZSAC 250mA). It was made by speaking into the microphone
> normally for a minute and accumulating the trace with the spectrum analyser
> on peak hold. The lower trace is a barefoot FT1000MP, the upper trace is the
> output of the linear.
>
> 73, Mark, G4AXX
>
>
>
>>>>"ad5gb" <ad5gb@myway.com> 18/03/05 20:33:36 >>>
>>>
>
> I just found a chart that listed the distortion characteristics of varioius
> tubes. I was really disappointed to see how poorly the 4CX1000A ranked
> amongst
> the competitors. IIRC, I think it was the absolute worst in the bunch.
>
> I got a couple of these things (with sockets) very cheaply a little while ago
> (well maybe longer than that ) and hoped to build something nice for HF out of
> them. I planned to try a grid-driven AB1 configuration at max anode potential
> with the best screen/bias regulation I could come up with but based on that
> chart.... it doesn't look like the most wonderful of things to try to do.
>
> Anyway to make these run more satisfactorially? Cathode drive /w NFB?
> Grounded
> screen (float the cathode below ground) Anyone with any experience and
> distortion figures better than in that Eimac chart I found?
>
> Thanks
>
>
> --
> Randall D. DuCharme (Radio AD5GB)
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