Cool. That is a new one on me. The photo really helps me visualize it. A local ham suggested I fill the tubing with that expanding foam insulation stuff that comes in a aerosol can... thinking it wou
Sure James: Here is a link to Staffan's home page: http://www.lannabo.se/ And here is a link to the manual: http://www.lannabo.se/Manuals/Manual-vertical-dipole-english.pdf I don't know if Staffan de
James: "He who turns and walks away, lives to fight another day." There will be other projects and for sure you will find a use for that material! 73 Rick Cool. That is a new one on me. The photo rea
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 08 Jan 2011 18:29:27 -0600
My dad and I did that to a rotating pipe mast in the late 1950s. 60 feet of 4" galvanized pipe with a bearing and guy wires at about 565 feet. It stood (except for the times we took it down to work o
Filling your tubing with foam is the biggest nonsense I've ever heard. Jim, it took me several years to figure out something that should be obvious. "If something is worth doing, it's worth doing rig
Thanks... really interesting. I did not expect a multiple band design, which is a bonus. == James -K8JHR == == _______________________________________________ TenTec mailing list TenTec@contesting.co
I was bugging Staffan for years to build me a 40m version. Never happened. Not enough demand, I guess. It is a nice 5 band antenna, and not much to break, but it isn't exactly "stealth". It is pretty
Thanks, Jerry. A lot of buckshot in that one shell ! I had discussed with my local friend the notion of putting a wooden dowel through the tubing, and you give a fine exegesis for why that is a bette
Oh... come now... not the biggest....? ! ? SOMETHING else must take the cake... ;-) UNDERSTOOD ! My wife calls me "Mr Overkill" because I tend to overbuild everything. Good tools are worth good money
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 09 Jan 2011 20:06:07 -0600
Prekinking the tubing would be more nonsensical. Wire supported by fiberglass has considered resilience to abuse, but the thin conductor compared to tubing tends to make the antenna narrow banded. An
Another fix for "strumming" of beam elements is to fill them with poly rope. The whole idea is to change the resonant frequency to stiffle vibrations. -Stuart Rohre K5KVH ____________________________
Or build the antenna from the start in a way, such that it inherently supports itself. 2 examples: Hex Beam and Spiderbeam 73 Rick Another fix for "strumming" of beam elements is to fill them with po
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 10 Jan 2011 19:04:16 -0600
I think some changing of the mechanical resonant frequency, but mostly adding damping so the element doesn't ring. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 10 Jan 2011 19:42:46 -0600
The wire elements in the Hex Beam and Spideream surely vibrate in the wind, on power and phone wires its called Aeolian vibrations, most prominent at light winds. http://www.uh.edu/engines/epi1653.ht
Jerry and the group: I wondered if there was a name for that effect. Polyrope was indeed my enemy one 30 below moonlit night out in the Alaskan Bush. I had a 20-foot spruce pole mast attached to a ca
Of course they do, but it doesn't hurt them, and it certainly doesn't hurt the RF.... or does it. Maybe Jerry just found the true source of LDE! Rick The wire elements in the Hex Beam and Spideream s