[Elecraft] Interesting Tuner applet

[Ron D'Eau Claire]

While a T-network is not necessarily lossy at moderate impedances, try using
one to load up a short antenna. 

For example, a 25 foot end fed wire on 80 meters will show an impedance of
about 3-j550 ohms. A T-network tuner will match it okay, but with a loss of
7 dB! That's a loss of about 79% of the RF passing through the tuner.

That's why I might T-matching network for moderate mismatches in the
vicinity of 50 ohms, but avoid them for wide-range matching of multi-band
antennas, most especially any antenna that is less than 1/4 wavelength long.


A T-match is good at producing a 1:1 SWR to the rig okay, but so will a
dummy load.

The Elecraft ATUs, by the way, use an L-network instead of a T. That's a
whole different "animal" and a lot more efficient. 

Ron AC7AC