Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Mon, 30 Apr 2018 18:54:49 -0400
So, I will add an other penny that come from an actual failure: I had put up 30' aluminum mast in Brooklyn, NY. It was made of 1 1/4 " aluminum conduit pipes. As I didn't know much about support etc.
I also verified this phenomena on a center and top guyed top hat loaded 40' vertical antenna that buzzed loudly with a similar sinusoid. After probably a few dozen periods of sustained 25 to 35 mph w
Author: J Chaloupka via TowerTalk <towertalk@contesting.com>
Date: Tue, 1 May 2018 07:31:38 +0000 (UTC)
Wondering, couldn't you wrap heavy gauge wire in a coarse spiral around the mast, similar to the wire wrapped around the proverbial automobile receiving antenna mast, in an attempt to dampen the vibr
On 5/1/18 12:31 AM, J Chaloupka via TowerTalk wrote: Wondering, couldn't you wrap heavy gauge wire in a coarse spiral around the mast, similar to the wire wrapped around the proverbial automobile rec
The reference about power line cable oscillations is interesting, I think more applicable to wire antennas rather than masts. I found this thesis which delves into the issues for masts and how to use
When I built my first 90 foot vertical, I made the whole thing out of three 30 foot pieces of 4 inch OD aluminum irrigation tubing/pipe, guyed at the joints at 30 and 60 feet as well as at the top. I
On 5/1/18 8:46 AM, Grant Saviers wrote: The reference about power line cable oscillations is interesting, I think more applicable to wire antennas rather than masts. I found this thesis which delves
I had a vertical for 40-meters using a Cushcraft AV-80 for aluminum stock. This had a fiberglass rod at the bottom for an insulator, a heavy wall bottom section and several sections of 2" OD aluminu
Author: Patrick Greenlee <patrick_g@windstream.net>
Date: Wed, 30 May 2018 09:09:39 -0500
What got the first mast was what is variously called an Aeolian Harp after Aeolius the god of wind and AKA cable strum. As you noted, a resonant effect. De-tuning is the answer (or sufficient stif