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!
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