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Boston Area DXers member Steve Byan was first out of the gate with a Vactrol
scheme initially applied to Beverage termination in 1996. His controller was
successfully used on late '90s Newfoundland DXpeditions. The original Vactrol
he used had a sealed incandescent light element to control the photoresistor.
The version being used since about 2000 uses an LED light source instead.
That's about the time that Ewes, Flags, Kaz Deltas, Pennants, K9AY's, and other
terminated loop designs gained popularity in the medium wave DX and 160/80m ham
communities and this method of termination control quickly showed its value in
solving a problem.
Mark Connelly, WA1ION
South Yarmouth, MA
<<
Good stuff, Mark.
Here's some more "prehistoric" reading with Vactrol details:
https://web.archive.org/web/20071030091410/http://users.rcn.com/oakridge.ma.ultranet/Beverage_info/RCT_Beverage/RCT_Beverage.html
73,
Guy Atkins
Puyallup, WA
> From: Mark Connelly <[email protected]>
> To: [email protected], [email protected]
> Cc: [email protected]
> Date: Wed, 24 Feb 2016 11:42:05 -0500
> Subject:
> ??
> Re: [NRC-AM] Vactrol for Flag?
> Some "prehistoric" (2002) writing on the subject:
> http://www.qsl.net/wa1ion/flag/flag_antenna.pdf
>
>
> Mark Connelly, WA1ION
> South Yarmouth, MA
>
>>
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