On 5/18/2020 4:47 PM, n6sj@earthlink.net wrote:
I'm using Davis RF Bury-flex for my rotor loop.
I think that's a great choice, but only the guys who climb my towers
know for certain what's up there. :)
LMR400UF is a bad idea, because it does not do well with UV. I bought
some from an SMC contester at a Chicago hamfest years ago after he
learned that. I learned it years later when I used some of it in my
outdoors in my station out here in W6.
In the second edition of his book on Interstation Interference, W2VJN
noted that he had observed deterioration of stubs made from LMR400 that
had been stored in his garage for a number of years. He blamed it on
corrosion between the braid and foil shields. The performance of stubs
for harmonic suppression depends on them placing a near short circuit
across the line at the harmonic frequency. Any increase in the
resistance of the shield and/or the center conductor will make the stub
less effective.
73, Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|