[Elecraft] T1 tuner issue

[Don]

That is just about the worst matching challenge you could try.  At 20 meters 
*each* side of the dipole is a half wave and presents a very high impedance 
to the feedline.  The actual impedance presented to the tuner depends on 
feedline length  and type of feedline so results are unpredictable.

Inserting 20 meter traps and adjusting overall antenna length accordingly 
may be the way to go ... or just hang a 20 meter sloping Vee off the center, 
or something like that.

A lot of us started our 'antenna' careers by just trying this or that ... 
but eventually broke down and studied the subject to reduce the wasted 
effort outside by expending a little effort inside where it is more 
comfortable.  Grab a handbook .. and good luck.

Don K7FJ




> Hello All,
>
> I just got my SW-20+ working, and I ran into an
> antenna question.  Currently, I don't have a 20 meter
> antenna, so I thought I would try to use my 40 meter
> dipole with it and just use my  Elecraft T1 to tune it
> to 20m.
>
> It it didn't work too well...I got an SWR around 2.5.
> Is this to be expected, or could there be an issue
> with the T1?  The T1 sure sounds like it is working
> hard to get to the 2.5 (relays are busy).  My antenna
> ignorance is probably showing, but since 20 is a
> direct multiple of 40, I thought the T1 wouldn't have
> a problem matching.
>
> So I guess my question is:  Is something wrong with my
> T1, or do I just need to put up a 20meter antenna?
>
> 72,
>
> Kurt - ae6uj
>
>
>
>
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