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 <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 <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]> 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]> 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. I have not detected > any deterioration of any sort and it doesn’t stretch nor kink. > > > > Orville. > > > > *From:* tdxs-list [mailto:[email protected] > <[email protected]>] *On Behalf Of *Chuck Dietz > *Sent:* Tuesday, May 9, 2017 12:47 PM > *To:* [email protected]; [email protected] > *Cc:* [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]> wrote: > > The below should read 75 thru 80 meters. > > > > Gerald Muller K9GEM > [email protected] > > > > _________________________________________________________________ > To unsubscribe or modify your subscription options, please visit: > http://lists.tdxs.net/mailman/options/tdxs-list/w5dpt%40icloud.com > > > _________________________________________________________________ > To unsubscribe or modify your subscription options, please visit: > http://lists.tdxs.net/mailman/options/tdxs-list/wn3ocv%40gmail.com > >
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