On Wed, 01 Aug 2007 14:46:35 -0000, Harry7 wrote:

Danny,

I've never built a balanced L tuner so I admit I'm speculating. The
link coupled designs I've built seemed much easier & simpler
mechanically & they will give 1:1 if the taps are in the right place.
Just takes some intial fiddling to find the right places but once
that's done you're good.

I'll agree the double L's seem to be just as easy to tune but the
building always deterred me.

Have you ever measured the balance of your double L at various
freqs. (current on each leg of the feedline)?

Terry
W8EJO

Terry,

I have not measured the current balanced on my feed line as the
antenna system is not perfectly balance. Although my antenna is as
geometrically balance as I can construct it, the environment where it
is installed is not symmetrical . (Yard clutter, ground conditions
and etc) That is a whole different topic but is explained very well
he http://k6mhe.com/sub/BalancedFeedLine.pdf

I have measured the balance of my antenna system by measuring the
impedance for each leg. On twenty meters, for example, I am seeing
about a 10% unbalance. http://k6mhe.com/sub/Balance_Z_L1_L2.gif

Additionally, checking feed line balance by measuring current using
RF amp meters of each leg of open line will not accurate due the fact
that RF amp meters do not give any phase information. Roy corrected me
on that some time ago.



73,
Danny, K6MHE