[TowerTalk] 80M antenna wire size

[jimlux]

On 1/5/20 7:11 PM, Jim Brown wrote:

> 
> What I HAVE done (about ten years ago) was to add a second #10 THHN to 
> my Tee vertical for 160M, spaced roughly 8-10 inches from the first, 
> wired in parallel top and bottom. The vertical section is 100 ft. The 
> measured result was to approximately double the SWR bandwidth.

So, going from l/d  of 12000 to 120 -> that's a big, big difference, and 
the change in SWR bandwidth would be expected.





> 
> My experience has been that when I correctly define the model (wire, 
> insulation, height, soil parameters) NEC gives me pretty good 
> correlation with what I measure when the antenna is built and installed. 
> An example: for a CQP site we used for several years, I modeled a 40M 
> dipole at the height we were able to rig it in the scrub trees at the 
> site, and over poor soil, which is what is there. The model predicted 75 
> ohms, so we brought RG11 for it. Our SWR bridge that was referenced to 
> 75 ohms read close to 1:1 at resonance.
> 
> 73, Jim K9YC
> 
> On 1/5/2020 9:57 AM, Jim Thomson wrote:
>> 10  gauge  wire  provided  for a   much wider  BW,  vs  the   16  +18  
>> gauge  I  tried  previously.
>> 2  other  folks here  in  town tried the  same experiment...with  
>> same  results.
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk