A lot depends on the band. For example, your 20m vertical would have an
SWR of only 8:1 on 17m. Loss with 50' of RG-58 would be about 2 dB.
That's not insignificant, but a lot better than not being able to
operate on 17m at all. The built-in K3 tuner would have no trouble
matching it.
I am actually using a 20m dipole on 40. But my feedline is short (34')
and it is 600-ohm open wire line. SWR is something like 85:1, and I am
living with a loss of about 3 dB because it is a compromise solution
that gets me a 7-band antenna in limited space.
73,
Vic, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 7 Aug 2016 06:57, rick jones via Elecraft wrote:
OK a very good reality check when you look at the numbers! So I'm
still trying to figure out the usefulness of a built in tuner. Two
situations come to mind: You have no feedline and are driving a wire
right out of your rig with a counterpoise (KX3 portable operations)
OR you are using it to just "touch up" the load on the PA from an
antenna that is close to resonance. I would hope that a good Elmer
would point out that a built in ATU does nothing more then keep your
PA happy but does nothing toward getting out a good signal AND that
if a tuner is necessary, a remote one is a better choice. Thanks for
your patience everyone while I get these concepts "right". Other
forums would not have been as accommodating.
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