Topband: Chokes for Beverages

[Jim Brown]

On 6/21/2012 8:47 AM, Guy Olinger K2AV wrote:

> I have recently replaced some "RG-6" in use for maybe seven or eight 
> years. I opened it up to see what was happening.   The degree of 
> oxidation on the inside and outside of the foil was perplexing.  One 
> could easily draw a thumbnail along either side and build up a little 
> pile of oxide.  The foil itself had become very brittle.  It had been 
> "sealed" and treated outside. 

In the most recent version of his excellent book on Interstation 
Interference, George, W2VJN, noted that he had observed deterioration of 
stubs made with LMR400 that had been stored in his garage for a period I 
seem to recall was on the order of 8 years. Although a properly 
installed connector (and no doubt that George did that) should make 
excellent contact with the braid, which is tinned copper, differential 
current will be on the inner surface of the shield, which is foil.

73, Jim K9YC