Re: KAT500 Remote Version

Posted by ab2tc on Sep 20, 2012; 10:58pm
URL: http://elecraft.85.s1.nabble.com/KAT500-Remote-Version-tp7563017p7563044.html

Hi,

That's not true. The L network's only solution is the lowest Q possible, meaning it will have the lowest tuner loss possible and the widest bandwidth. And if the capacitor and inductor steps are made small enough, a 1.0:1 solution is always possible. The fact that many tuners give up once the SWR is below 2.0 or 1.5 is merely a shortcoming in their tuning algorithms. I am having high hopes for the KAT500. Is anything known on how many bits of L and C resolution is there?

AB2TC - Knut

Wes Stewart wrote

What Don says is true as far as it goes.  The L-network tuner has only one solution, but it isn't necessarily a good one.

Way back in 1998 when correspondence was via typewriter and snail mail, I went around with Dean Straw, N6BV, then Editor of the ARRL Antenna Book, about tuner losses.  This was in conjunction with the editing of my paper, "Balanced Transmission Lines in Current Amateur Practice" that appeared in the Sixth Edition of the ARRL Antenna Compendium.

Remarkably (coincidence I'm sure ;) it wasn't long before favored authors were contributing articles to QST about how to measure tuner losses and TLW was written.

Tuner and line losses really do matter.

Wes  N7WS



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