[Elecraft] Balun Questions

[Jim Brown]

On Tue,2/9/2016 11:46 AM, 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...

Note that my observations are confirming results published several 
decades ago by Jerry Sevick, W2FMI. My observations of Zo and Vf are on 
the basis of measurements using a VNA and exporting data to AC6LA's 
ZPlots Excel spreadsheet.  I consider my data good to about 15% for Zo 
and 10% for Vf.

> 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?

You may have been confused by my writing. Enameled wire tends close to 
50 ohms, THHN in the range of 85-100 ohms.

73, Jim