[Moon-net] Protecting Copper Feeds

[Darrell]

Hi Rex & All;
After building approx. 100 23cm & 13cm feeds I do not recommend a 
coating internally at all.
I do however apply Krylon UV coating to the outside as well as the 
Scalar internally , but NOT the Wave guide inside at all because of 
skin surface resistance.

The Krylon I use is:
  http://www.shoptheartstore.com/product_detail_multiple.cfm?groupID=74DB926C-88DF-4D5F-972DCF8655C6A3D3&shownav=0

WW2R found it locally at WalMart I believe??? and considerably less 
costly. Not sure if the same Product Number or not??

Regards & Thanks, Darrell


At 10:29 PM 8/28/2006, you wrote:

>I have just completed a new 1296 MHz feed based on a circular waveguide with
>Septum polariser and a W1GHZ, Super VE4MA choke ring. It is all made of
>copper. In terms of RF performance, should I protect the copper (in
>particular the inside of the feed) with some sort of coating (in which case
>I would appreciate recommendations) or should I just let it oxidise?
>
>73 Rex
>VK7MO
>
>
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