|[AMRadio] Windom Antenna [SPAM : scl = 4]|
k0ng at inebraska.com
k0ng at inebraska.com
Tue Dec 28 11:59:11 EST 2004
Hi Jack: Apparently your reply went out to "all". Probably same here.
I have replied to several of your messages but your spam filter does
not like me and kicks them back. Will see what happens here.
(sorry if this goes to the gang) 73, Charlie, K0NG
Quoting Jack Krisel <wa9nqw at nconnect.net>:
> Hey Charlie!!!
> Merry Christmas,
> Hope you all are well and kicking out in cornland.
> Down in the basement here with the fireplace going (gas, not a walk out
> basement like my place out there)
> Listening to the HRO-50 on the broadcast band with a 10 foot
> wire....next year a bigger skyhook, hi.
> Got a local fest on Jan 8, hope wx co-operates.
> Whats going on at Telex?
> On Monday, December 27, 2004, at 07:56 PM, k0ng at inebraska.com wrote:
> > Wouldn't it be real simple to use a Line Flattner/"Antenna Tuner" to
> > the
> > single wire transmission line, fed against good ground, to a Windom
> > that
> > is close to resonant on most of the bands, get on the air and enjoy its
> > properties?? 73 , K0NG .
> > Quoting Geoff/W5OMR <w5omr at w5omr.shacknet.nu>:
> >>> In QST magazine for September 1929 the original Windom Antenna
> >>> article
> >>> starts on page 19. It clearly shows that it is exactly resonant on
> >>> all of
> >>> it's design bands, so long as there is an harmonic relationship.
> >> 80-40-20-10
> >>> etc. There are diagrams included which show how this is determined
> >>> with an
> >>> RF ammeter and a rolling trolley after which very precise and
> >>> repeatable
> >>> formulas were derived. Of course this is the single wire fed
> >>> version. The
> >>> later 300 Ohm job is merely wishful thinking.The length in feet is
> >>> always
> >>> 468, divided by desired frequency in Kc. For the lowest desired
> >>> band. The
> >>> tap is always feet times 25 divided by 180. I might add that
> >>> antennas put
> >> up
> >>> as temporary during this nasty winter weather last 20 to 30 times
> >>> longer
> >>> than summer installed permanent antennas. happy antenna
> >>> experimenting. 73,
> >>> K4XM, Mike.
> >> So, in order for this to work, you have to decide what frequency
> >> you're
> >> going
> >> to operate on, on the HIGHEST frequency the antenna will cover.
> >> ie: 29MC /2 = 14.5, 7.25, 3.625, 18.125Mc.
> >> that being the case, then
> >> L = 468/f(L)
> >> L = 468/18.125
> >> L = 258.20689655172413793103448275862
> >> Now, you said that the 'tap is always feet times 25 divided by 180'
> >> T = 258.207ft * 25 / 180
> >> T = 6455.17 / 180
> >> T = 35.862068965517241379310344827586
> >> Single wire feeding it? Fed against Ground? Doesn't the single
> >> feed-line
> >> then
> >> become part of the radiating antenna?
> >> Even if someone were to take, say the output of a link and feed it
> >> directly
> >> to
> >> the
> >> open wire feed-line, the open wire line would have to go all the way
> >> to the
> >> feed
> >> point of the antenna, wouldn't it?
> >> I'm sorry if I'm seeming a little dense, but I can't get unwrapped
> >> from the
> >> 'single wire fed version' of this antenna.
> >> Open wire output from the link has *2* wires. I can see attaching
> >> them to
> >> some
> >> open wire line, and feeding this Wyndom antenna at 1.8125, and having
> >> the
> >> antenna resonant on 3.6250, 7.250, 14.5 (oops - can't operate there)
> >> and
> >> 29Mc,
> >> but I simply fail to understand how one wire is going to feed an
> >> antenna
> >> thas
> >> has two posts to connect to.
> >> Certainly has me thinking, though. Now, if I could just come up with
> >> land
> >> that
> >> had 300' (for guy supports on both sides)
> >> I'll have to work CW on 3.6250, forget about 20m and enjoy a
> >> multi-wavelength
> >> antenna on 10m (when the band is open). Pardon the sarcasm ;-)
> >> Seriously, here. Surely, there must be something I'm missing, to be
> >> able to
> >> use
> >> this antenna on all bands, with acceptable VSWR.
> >> 'Splain it to me, please.
> >> Happy New Year
> >> 73 = Best Regards,
> >> -Geoff/W5OMR
> >> ______________________________________________________________
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