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KG6BAJ > NWSGRP 29.09.09 22:43l 25 Lines 1037 Bytes #999 (0) @ WW
BID : 12066_N1OES
Read: GUEST
Subj: Re: Open wire feedline
Path: DB0FHN<DB0MRW<DB0ERF<OK0NHD<OK0PHL<OK0PCC<OM0PBC<OK0PPL<DB0RES<DK0WUE<
7M3TJZ<CX2SA<N6RME<KG6BAJ<KG6BAJ
Sent: 090929/1200Z @:KG6BAJ.#NCA.CA.USA.NOAM #:12066 [Grass Valley] InterGate $
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : Tim Shoppa <shoppa@trailing-edge.com>
On Sep 29, 10:07=A0am, Cecil Moore <nos...@w5dxp.com> wrote:
> However, 50 feet of ladder-line is ~1/4WL. The low 80m feedpoint
> impedance tends to be transformed to ~4k ohms. Most built-in
> autotuners will not handle such impedances.
I personally think it's unlikely that even if someone is trapped by
the fancy-pants autotuner they bought, that they probably don't need
an extra fifty feet of line to deal with it. In my experience even ten
extra feet of line at 80M can noticeably change the matching taps I
use on my tuner if you're working in the 1/4 WL 65 foot feedline
range. Of course that extra ten feet might make their fancy pants
autotuner crap out on 20M, etc. and I can see how someone might start
feeling like the old lady that swallowed the fly. I would rewrite the
song to "swallowed the autotuner".
Tim N3QE
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