[Boatanchors] 300 ohm twinlead?

[Vic Rosenthal]

Brian Clarke wrote:

> Here is what you need to do:
> 1. specify your frequency of interest;
> 2. measure the diameter of the conductors in the cable;
> 3. have a look in Terman's Electronic and Radio Engineering for skin depth
> vs frequency;
> 4. calculate the effective current carrying area;
> 5. apply your favorite Amp/sq in figure.

But don't forget that unless the SWR is 1:1 the current will vary at 
different places along the line.  In this case the current measured by 
an RF ammeter means little unless you can move it around and find a 
point of minimum or maximum current.  The maximum will be the minimum 
multiplied by the SWR.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco