Rick:
I understand this approach was applied by G3TXO to the original
Hex Beam design which resulted in the popular Broadband design.
It just goes to prove: "The Best is the enemy of the Good."
73s,
Gary Sitton, K5AMH
[email protected]
On 5/9/2017 20:41, Rick Hiller -- W5RH via BVARC wrote:
Evening Gents.......for those that wish to dig a little deeper into
the wide banding issue and see what is happening out there in the
contesting antenna world, let me recommend that you have a look at the
2016 Dayton Antenna Forum presentation on OWA's -- Optimised Wideband
Arrays. He, a Penn State prof, has gotten some very nice flat SWR
responses using some simple parallel wire techniques. He also looks
at the current art 80 and 40 wide banding techniques, including the
Bazooka.
_http://www.k3lr.com/Dayton/Dayton2016/wa3fet.pdf_
These wide banding techniques are what is taking over the world in
Yagi-Uda design/implementation. See another Dayton presentation (same
K3LR Dayton page) by Justin Johnson, G0KSC. Wide banding, low
noise and direct matching.... all at a cost of slightly reduce
parasitic gain, and slightly reduced F/B, but an increase in antenna
system efficiency due to the lack of the lossy matching network (i.e.
Gamma, T, Hairpin, etc.). This technique has been stareing us in the
face out of the ARRL Antenna Handbook since the 50's and only Mosley
took advantage of it back then, but never pushed the details of its'
advantages...IMHO.
Another way to broad band an 80 meter dipole is to utilize a Tornado
Loading/matching coil. K3LR highlighted this in his 2017 Greater
Houston Hamfest K3LR Multi-Multi talk. Read about it in the BVARC
May newsletter -- Page 5 --The Radio Hotel column
_http://bvarc.org/newsletter/201705.pdf _
Lots of neat stuff going on in the Amateur antenna design world in the
last decade or so.
Enjoy.....73...Rick -- W5RH
Rick Hiller
/The Radio Hotel/ -- W5RH
On Tue, May 9, 2017 at 2:40 PM, louis House <[email protected]
<mailto:[email protected]>> wrote:
The KW-80F Unadilla traps installed with a length of 3'3' wire
(plus or minus the length needed for resonance in by CW portion)
should allow for opting the whole band .
Or make an 80 meter dipole and use a tuner for the top portion.
Lou
Sent from my iPhone
On May 9, 2017, at 1:18 PM, Orville <[email protected]
<mailto:[email protected]>> wrote:
Chuck,
I concur. My inverted vee has about the same bandwidth as yours.
I am the one that offered the double bazooka to Robie, but can’t
find it now. The one I have/had is cut for 75M and wouldn’t work
on 80 CW. I decided to just go for the inverted vee with the
center at 50 ft., and it sure has worked the DX. The legs are
running North-South. My last 5 80M QSO’s were with A25UK, 5V7P,
4X4NJ, J5B, and FJ/N2EIN…
I was having problems with my galvanized stranded wire usually
used for marine antennas as it started to rust and I was
extremely hesitant to touch it even with gloves, after less than
2 years.
I found a great product from Davis RF called Flex-weave. It is a
polyethylene coated #14 wire made of 168 strands of #36 wire. It
is a very tough coating and is very flexible and resilient.
http://www.davisrf.com/antenna-wire/flexweave.php
<http://www.davisrf.com/antenna-wire/flexweave.php>. I have not
detected any deterioration of any sort and it doesn’t stretch nor
kink.
Orville.
*From:*tdxs-list
[mailto:[email protected]
<mailto:[email protected]>] *On Behalf
Of *Chuck Dietz
*Sent:* Tuesday, May 9, 2017 12:47 PM
*To:* [email protected] <mailto:[email protected]>;
[email protected] <mailto:[email protected]>
*Cc:* [email protected] <mailto:[email protected]>
*Subject:* Re: [tdxs-list] Fwd: 80 Meter inverted V dipoile
I don't think a dipole will work over that broad a range. I only
get about 100-120 kHz.
Chuck W5PR
On Tue, May 9, 2017 at 12:21 PM Gerald E Muller via tdxs-list
<[email protected] <mailto:[email protected]>> wrote:
The below should read 75 thru 80 meters.
Gerald Muller K9GEM
[email protected] <mailto:[email protected]>
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