[TenTec] OT 75 Ohm twin feeder

[Steve Hunt]

Gary,

I've tried "lamp cord" for QRP work in the past; this time I was looking 
for something that would handle the UK limit of 400W.

Also, the "lamp cord" I tried was closer to 100 Ohms which is too much 
for the Hex application. It's always a surprise to me how close the 
conductors have to be to get a low Zo. 90 Ohms is pretty easy, but 50 
Ohms is a real struggle - the spacing needs to be less than 10% of the 
wire diameter, depending on the dielectric constant of the surrounding 
material of course.

I'm happy with the RG58 solution if it will stand up to the power.

73,
Steve G3TXQ

CSM(r) Gary Huber wrote:
> Try common "lamp cord"... the two conductor parallel kind. depending upon 
> gage of the conductors, you will find them very close to 75 Ohm.
> Obviously not a high power solution.
>
> 73,
> Gary - AB9M
> www.csm-gh.com
>
>   
>