[Elecraft] Balun Questions

[Bob McGraw K4TAX]

Yes, insulation does in effect cause the electrical length to change.

Case and point, construct a 1/2 wave antenna using insulated wire, put 
it up and determine the resonant frequency or point where the SWR is 
1:1.   Then take it down, carefully strip off the insulation and put it 
back in the same place.  Make the same measurements to determine 
resonant frequency or point where the SWR is 1:1.  You'll find it 
changed due to the K factor contributed by the insulation.

73
Bob, K4TAX



On 2/9/2016 1:46 PM, Dave Cole wrote:
> Hi Jim,
>
> I have been reading about your exploits with THHN, and the 100 to 50
> ohm change caused by the insulation...
>
> I am going to pick some up today and wind a choke using it, (as opposed
> to enameled 14 GA copper), to see just how close to 50 ohms it will
> come...  Any last minute tips?
>
> BTW, thanks again for publishing all of your work!
>