Re: [amsat-bb] interesting observation on helix feed

[Cliff Buttschardt <cbuttsch@xxxxxxxxxx>]

Excellent report Scott!  thanks   Cliff K7RR

Scott Townley wrote:
> 
> This reminded me of the discussion of whether or not to paint raw metal
> (material heat gain).
> I firmly believe any job worth doing is worth doing over and over again, so
> my helix feed for my AO-40 dish is simply tack-soldered onto the pin/solder
> cup that comes out of the N-type panel connector.  No other means of
> physical support.  Well, in this case the ground plane for the helix feed
> is a 6" diameter coffee can lid, unpainted.  The helix is 1/8" refer
> tubing, also unpainted/untreated.
> Today in passing I noticed the helix was akimbo re: where it should be
> pointed with respect to the reflector.  Investigating bare-handed showed
> that it was really darned hot...evidently hot enough to move the solder
> joint into the plastic region--gravity took care of the rest.
> It was under 100F (38C) in Phoenix today, but the solar loading was
> evidently enough to do the trick.
> hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
> 
> Scott Townley NX7U
> Gilbert, AZ  DM43di
> http://members.cox.net/nx7u
> 
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