[Moon-net] Circular feed questions

[Edward R. Cole]

Jerry and Ken:

Interesting.  I was a sat-TV dealer in the late 1980's and remember well
the "gold ring" as we used it on Winegard 10-foot TVRO dishes (F/d ~ 0.37).  

I have two of the Chapparal 11-GHz 3-ring "scalar" feeds and plan to use
one on my 8-foot ku-band dish (f/d=.375) for 10-GHz eme someday.  IT
currently has a cylindrical feedhorn with wr-90 ports and w/g feed.   I
have the notes where Paul Wade tried them out by directly attaching wr-90
to the cylindrical feeds with little return loss.  Paul may still have this
on his website, somewhere?

I am using scalar conical Chapparal feeds for my terrestrial offset feed
dishes.  Paul currently lists them with his dual-band feed on his website.
But this is appropriate for f/d ~ 0.6-0.7.

I expect it will be another couple years before I can set up for 3cm-eme.

73's Ed - KL7UW

At 12:17 PM 9/2/2006 -0700, Jerry Kleker wrote:
>
>Hi Ken,
>
>Thanks for the email.
>
>You don't realize it, but you covered an awful lot of ground.
>
>I knew Tay since the beginning of TVRO in 1979 and we were close in touch
regarding his work on 1296
>feeds. He told me how to build the scalar for my 1296 EME feed, which
works very well. More info later.
>
>He got interested in 10 GHz EME shortly before his death and just as I was
starting to get interested in
>10 GHz. We didn't get a chance to share any 10 GHz ideas before he died so
I have no knowledge of 
>what he was doing with feeds at the time.
>
>Regarding the "Gold Ring". The early Chaparral feeds (1980s) were made for
an f/d of .5, which was the
>popular f/d at the time, and were cast in one piece. Later, dishes with 3
and .4 f/d started to appear 
>on the scene and it was at this time that Tay came up with the Gold ring
to accommodate them.
>
>The "gold ring" was short-lived because then Tay came out with the
"adjustable scalar" which then
>took care of feeding any dish, no matter what the f/d was.
>
>The Chaparral 10 GHz TVRO feed has been used by many of the Hams. More
later.......
>
>I will stop here in order to dig up some reference material. "I'll be baak".
>
>73,
>
>Jerry    W7QX
>
>  Hi Jerry I have been following the 10GHz polarization topic with interest.
>
>  The late Tay Howard,W6HD, lived in my neighborhood.As you probably know
he was a founder of Chaparral. At the time of his death,Tay was working on
10GHz feeds adapting the Chaparral feedhorn. Prior to his death,
unfortunately I was not paying close attention but he was using one of his
Chaparral feeds with the servo controlled polator to change polarity,to
linear or RHCP and LHCP.I believe he made several 10GHz contacts utilizing
this.Have you heard of anyone else adapting the Chaparral horn to amateur
EME usage? Sounds like a interesting possibility.
>
>  I have a .28 F/D dish that as you know is difficult to feed.Chaparral
used to add a "gold ring" to their feeds to extend the useable F/D range.I
can't find any info on what it physically looked like and apparently it was
discontinued later.Do you have any info?
>
>  Tay Howard was one smart guy.I used to enjoy visiting with him.
>
>  73,Ken,W6GHV
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