[Elecraft] Re: OT- Using two coaxial cables as a balanced feeder

[Fred Jensen]

Don Wilhelm wrote:

> If your tuner has a limited range and cannot properly match the 
> feedpoint impedance of the feedline, adding (or subtracting) a length of 
> line to the feeder length can bring it into a range that your tuner can 
> match.  I would suggest adding or subtracting in 1/8th wavelength 
> increments until you get it close to the desired range and then go to 
> 1/16th wavelength additions or subtractions.  The feedline acts like an 
> impedance transformer when it is operated with an SWR other than 1.
> 

Or, use N6BV's TLW [comes with the ARRL Antenna Book 20th ed] and just 
calculate it.  I modeled one of my low band antennas to get the feed 
point impedance, and then used TLW to compute the open wire line length 
to the balun.  Worked great.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2008 Cal QSO Party  4-5 Oct 08
- www.cqp.org