[NLRS] loop yagi driven element corrosion

[Chris Elmquist]

OK. Thanks again guys.  I have received a couple other replies that suggest
this discoloration is happening elsewhere too and so that is a data point
I was looking for.   That's the good news/bad news piece that says it's
probably not some dissimilar metal action or magical mystery currents
eating away my loopers and just the elements doing their thing on the
elements ;-)

Am making plans to overhaul the whole setup here next year so will just
leave them alone until then and hope that Santa brings me a new tower
this Christmas and then I can clean them up and move them a lot higher
in the air where they really belong.

73, Chris N0JCF

On Thursday (09/15/2016 at 06:34AM -0500), Ray Johnson wrote:
> 
> 
> Hi All
> 
> In a later RSGB publication, Radcom I think, it was suggested that
> the original design was not the best for long term reliability.
> 
> The claim was that the bottom of the loop is a high current point
> and having an overlapping  joint there is bad for the long term.
> 
> The revised design would rotate the overlap point by 90 degrees and
> require 2 fasteners for each element: A long fastener to hold the
> element to the mast and then a short fastener to handle the overlap
> point. The claim is that this improves the reliability.
> 
> I am sorry I don't exactly remember where I read this.  A friend
> gave me some 20+ years of Radcom back issues and it would take a
> while to find that article
> 
> Worth the extra effort when you build a looper ?..........I will
> leave that discussion to the pontification crowd......
> 
> rayj  WB0EBG
> 
> 
> On 9/14/2016 11:19 PM, Dr. Gerald N. Johnson wrote:
> >
> >
> >In VHF Communications for 1/1978 an article on loop yagies
> >suggested the driven element and feed along with the screws be
> >coated with polyurethane lacquer and when it dried, the entire
> >antenna be coated with ordinary lacquer. Somewhere I have a
> >vintage RSGB microwave publication with a chapter on loop yagis,
> >but I haven't turned it up in my first search this evening.
> >
> >73, Jerry, K0CQ
> >
> >On 9/14/2016 9:40 PM, Chris Elmquist wrote:
> >
> 
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-- 
Chris Elmquist