[Elecraft] FW: The use of a doublet

[Ron D'Eau Claire]

Tnx Phil. 

Note that using the lengths do not improve the performance, only the
impedance excursions involved and they can be handled by a wide range tuner
quite nicely.

That said, some tuners show excessive losses at extreme impedances even
though they may show a 1:1 SWR on the coax link to the rig. I use a homebrew
fully-balanced link-coupled tuner with my doublets that I have considerable
confidence in having low losses across its range and the ability to match
everything from a fraction of an ohm to many thousands of ohms. Using many
"commercial" tuners I'd be much more concerned. 

The ARRL Handbooks have a table showing the combinations of wire length and
feeder length that produce the least extreme feed point impedances as well. 

Ron AC7AC

-----Original Message-----

I was asked why 90 feet of 300 ohm ladder line by the group.  Ron of DX
Engineering responds below.


Philip LaMarche 
LaMarche Enterprises, Inc.
www.instantgourmetspices.com