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?
73,
jack
On Monday, December 27, 2004, at 07:56 PM, [EMAIL PROTECTED] 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 <[EMAIL PROTECTED]>:
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
______________________________________________________________
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
______________________________________________________________
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
