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KG6BAJ > NWSGRP 29.09.09 22:44l 46 Lines 2055 Bytes #999 (0) @ WW
BID : 12071_N1OES
Read: GUEST
Subj: Re: Open wire feedline
Path: DB0FHN<DB0MRW<DB0ERF<OK0NAG<OK0PPL<DB0RES<DK0WUE<7M3TJZ<CX2SA<N6RME<
KG6BAJ<KG6BAJ
Sent: 090929/1200Z @:KG6BAJ.#NCA.CA.USA.NOAM #:12071 [Grass Valley] InterGate $
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : Tim Shoppa <shoppa@trailing-edge.com>
On Sep 29, 1:59=A0pm, Michael Coslo <m...@psu.edu> wrote:
> TimShoppawrote:
> > On Sep 29, 10:07 am, 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".
>
> Wow, you do not like autotuners, eh?
The autotuners that the neighboring hams have do not have knobs. They
just have a little button you push and then relays chatter and it
either succeeded or failed. There's a little LED idiot light to tell
you that it succeeded or failed.
I myself do not understand how a piece of radio equipment does not
have knobs. Or how it has little blinky LED's but no meters.
My homebrew tuner has alligator tips for selecting the turns on the
output link, as well as plug-in link-coupled coil sets for each band
and of course knobs on the variable caps. IMHO if a tuner has plug in
coil sets and alligator clips then you know you're cooking with gas. I
was looking a a picture of a station in the 1972 ARRL handbook last
night and realized that my tuner looks almost identical to the one in
the picture (which itself was probably 20 years old in 1972).
Tim.
Tim.
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