Can someone explain to me why THHN with insulation has the loss that is seen? If it becomes resistive, does it somehow inhibit radiation and does it result in heat in the radiation? If it only become
Current betting money in my neck of the woods is on some actual deterioration of the surface of the copper caused by compounds in the degrading insulation. Skin effect forces some degree of current i
Bare copper oxidizes. Visibly it appears worse than wire covered with PVC. Have you compared these measured THHN surface losses with bare wire that has been outdoors the same length of time? John KK9
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Wed, 28 Dec 2016 07:51:45 -0600
Skin effect... If skin effect can force conduction into the outer limit of the wire (the chemically altered part with poor conductivity) then why doesn't the skin effect force conduction out into the
My friend and guru (who refuses to post here) has been a ham for several decades, is a retired EE, and has 35+ years antenna design experience (his specialty) agrees with the concept that RF conducti
On 12/28/16 7:49 AM, jimlux wrote: On 12/28/16 5:51 AM, Patrick Greenlee wrote: Skin effect... If skin effect can force conduction into the outer limit of the wire (the chemically altered part with p
I wish to apologize for the caustic tone of my post this morning in which I questioned Guy's statements regarding degradation of RF current conductivity in THHN insulated copper wire over time in UV
We've all done it. On 12/28/2016 1:43 PM, Rob Atkinson wrote: I wish to apologize for the caustic tone of my post this morning in which I questioned Guy's statements regarding degradation of RF curre
Bare wire up outdoors over ten years, just what I would term a patina on the outside. This is in contrast to what happens to bare copper used in a woven coax shield which has become waterlogged, wher
UV and weather degraded THHN wire was replaced with new bare wire and 60 ohms resistance disappeared that was visible only at RF. The wires were all pulled between posts, and the old wire was NOT sag
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Fri, 30 Dec 2016 21:27:42 -0600
This is very interesting. I for one am quite intrigued and will be eagerly awaiting any definitive interpretable results. The stalactite analogy gives me pause to consider. Best of luck to all involv
While this topic was interesting, to start, I think I'll just stick with the tried and true of sticking aluminum and wire in the air the old fashioned way and working what I can. At my age I don't ha
Gents, I'm not a real technical person, but have been following this thread with interest. I have always used insulated wire for dipoles, verticals, and now have over 10K feet of the same in my 80/16
It's hardly a scientific rigorous investigation but I thought I'd mention that a few nights ago after I got home from work, I went into my garage and rummaged around and found a bundle of old no. 14
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 31 Dec 2016 21:56:03 -0500
Around here (5 mi W of Midland MI), with prevailing winds from the SW to N through W which is either woods or open fields for miles. There is a small village (Sanford) about 3 to 4 miles NNW. Bare co
When you use open wire line into a balanced matching network you don't worry or concern yourself with a "little stretch". In fact not even with a "lot of stretch". Lee, w0vt _________________________
Yes, it has nothing to do with the insulation. In an earlier post, I noted that I every two years, I have to circumcise my 80/40 JA fan that uses #10 stranded THHN for the 80M element. It's up about