>Sat, 22 Mar 2008 16:53:18 -0700
>steveve2swc
>Hi ALL:
>Looking for a Heathkit SB200, anyone got one for sale? Hopefully in the not
>too distant reaches beyond Montreal or NY/Maine/Vermont?
>Steve VE2SWC
Reply by Jim, WD5JKO:
Steve, Good luck with your SB200 search. If your application is AM, then an
SB-200 with a little de-rating to keep the power supply happy will be no more
powerful than a DX-100, Viking I or II, B&W 5100, Apache, etc.
I recall talking to Chuck, WA0ZHH, and he had designed an external cathode
modulator for the SB-200. I don't recall the details, but what I do recall is
that the SB-200 needed very little modification, and the efficiency is much
higher than a linear amplifier. Maybe this raises the % efficiency from 30-35%
to ~ 50% or so depending on the ratio of grid to cathode modulation.
I haven't heard Chuck on the air lately, and I thought someone said he had a
stroke. Any news from Chuck?
Regards,
Jim
WD5JKO
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