Re: NOT the feedline
Posted by
Jim Brown-10 on
Jun 02, 2020; 3:08am
URL: http://elecraft.85.s1.nabble.com/Re-NOT-the-feedline-was-KPA-1500-faulting-on-6m-SWR-issues-tp7661502p7661556.html
On 6/1/2020 5:47 PM, Peter Dougherty wrote:
> Ten-Tec Tuner,
This might be it, Peter. ! I've used (and loved) the Ten Tec 229 and 238
tuners, but some of their fixed capacitors are under-rated for power.
This is fairly well known among Ten Tec users, so I read about it
somewhere and replaced those in my tuners with caps having higher power
ratings.
There's another design flaw -- their antenna selection switch fails to
to provide a return for RF current, using the chassis instead. This adds
inductance in series with the signal path, which increasingly degrades
SWR and crosstalk with increasing frequency. Palstar makes the same
mistake in tuners I saw at Dayton 8-10 years ago. When I pointed it out
to a guy in their booth who claimed to be its designer, he told me I was
crazy!
73, Jim K9YC
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