>
>
>-----Original Message-----
>From: measures <2@vc.net>
>To: Conrad Farlow <conrad.farlow@virgin.net>; Douglas Snowden
><Douglas.R.Snowden@noaa.gov>
>Cc: AMPS <amps@contesting.com>
To: <amps@contesting.com>
>Date: 10 April 2001 19:06
>Subject: Re: [AMPS] MLA2500 and screen voltage for 4CX800.
>
>snip
>>>http://www.vcnet.com/measures/D.a.08.GIF is the circuit to use off Rich's
>>>pages. He also has a stack of zeners off the plate supply on another
>>>page.Please don't do this.
>>>
>>It was not Rich's idea. Eimac recommends a shunt screen regulator for
>>smaller tetrodes. I used the circuit in two amplifiers and dynamic
>>screen V regulation was better than 1%. A caveat: Operate zeners at no
>>more than 33% of rated dissipation.
>
>
>If I remember correctly, the measurements made by GW4FRX (and/or G3SEK?)
>showed a significant improvement in IMD if screen regulation was improved
>from around 1% to around 0.1%. That's not the same as saying that 1%
>regulation produces unacceptable results in the real world, but shouldn't we
>aim for the better target?
How good does screen regulation have to be? The TS-830s has a
not-regulated screen PS. This produces c. 5% regulation on SSB. .
However, the resultant IMD is better than any solid-state radio on the
market. . // Does GW4FRX sell a screen regulator?
>The effort of building a better screen supply is
>usually minor compared with the rest of PA building.
>
cheers, Steve
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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