Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 5 Aug 2014 14:26:59 -0400 (EDT)
Stan, the 45G tower is not rated for that height unguyed. Even if was rated, 6 sections would cost $1614 plus about $500 or so for freight. Universal has a model 4-60 that is rated for 80 mph winds w
Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>
Date: Tue, 5 Aug 2014 11:58:21 -0700
Based on my tower project (http://www.tinyurl.com/wa7prc-tower), I'd guess around $5K... about half for the parts and (paraphrasing Yogi Berra) the other 90% for labor and beer. YMMV. There's a US To
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Tue, 5 Aug 2014 18:12:01 -0400 (EDT)
So, if i understand it right: The elements should be galvanically connected to the bom to avoid static discharge (make sense), to enhance tuning the tower for 80/160 use (make sense). A small wire or
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Wed, 6 Aug 2014 11:06:44 -0400 (EDT)
correct element length, I can see you can use SWR to adjust the driven element. But how do you correctly know how to correct or adjust the reflector, or for that matter any parasitic element? During
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 6 Aug 2014 12:43:51 -0400 (EDT)
Well, the driven element will not need any correction as that stays insulated, unless you want to change from direct connect to gamma match). I just wondered if anyone had the experience with what co
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Wed, 6 Aug 2014 13:04:25 -0400 (EDT)
tower. It has been up about 9 years approx. About 3 years ago?this tower experienced winds of about 100 MPH, as my location was in the eyewall of Hurricane Ike for about an hour. ?? The tower only h
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 6 Aug 2014 22:10:47 -0400 (EDT)
Well done, but you usually don't find the resonance frequency in the building instructions for yagi antennas. Maybe that's something for the future. I have used grid-dip meters (with a tube, grid cur
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 6 Aug 2014 23:39:55 -0400 (EDT)
Usually you want to keep the non-split element non-split due to mechanical reasons. You do impair the structural strengths by splitting them even if you add material afterwards. Try the method of cou
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Thu, 7 Aug 2014 08:59:27 -0400 (EDT)
Thank you, Ian. Hans - N2JFS the My first reaction was "Go Google for it!" because there is lots of information about element length corrections on the web. However, there is surprisingly little on t
Author: Tom_N2SR via TowerTalk <towertalk@contesting.com>
Date: Thu, 7 Aug 2014 13:29:25 -0700
Have you looked at Norm's Fabrication? http://www.normsfab.com/plates.htm He displays in Dayton in the flea market area. I bought a bearing plate and a rotor plate from him. IMO, they look EXACTLY
Author: Dan Maguire via TowerTalk <towertalk@contesting.com>
Date: Thu, 7 Aug 2014 14:07:56 -0700
One way is to use the "equivalent diameter" concept as explained in Sec 9.1 of Leeson's "Physical Design of Yagi Antennas". If you decide to go that route the math is incorporated in the AutoEZ "Clam
Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>
Date: Fri, 8 Aug 2014 15:32:49 -0700
Hi Chip, I have a pair from Harbor Freight similar to that (w/o bottle). I used it to assemble ramps for my racecar's trailer. I used 3/16" SS rivets. I later found it useful to repair the element-bo
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Sat, 9 Aug 2014 12:43:59 -0400 (EDT)
I've always used mountain climbing boots. They have a rigid shank and have narrower soles than regular work boots. I can squeeze in my size 11's into 25G without too much trouble. The narrower soles
Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>
Date: Sun, 10 Aug 2014 09:46:26 -0700
I use incandescents with a CURRENT regulator. That makes for no inrush current (5X running current) that kills the filament prematurely. A cheap and easy to implement LM317L can be configured using O
Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>
Date: Sun, 10 Aug 2014 16:55:36 -0700
Hi Jim, A couple of years ago, I used a 60# demolition hammer (aka "jack hammer") to drive several 5/8" x 10' ground electrodes thru hardpan. One hit a BIG rock. After several minutes, it finally bro
Author: GALE STEWARD via TowerTalk <towertalk@contesting.com>
Date: Mon, 11 Aug 2014 10:43:38 -0700
Here is a source for all kinds of LED replacements for incandescent lamps... I'm a satisfied customer. 73, Stew K3ND http://www.cointaker.com/ ________________________________ _______________________
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 12 Aug 2014 11:04:33 -0400 (EDT)
? The Rohn 55g Bearing plate sure is expensive. I see two other possibilities. mast/bearing. I have no idea what the thickness of the Rohn bearing plate is as compared to a beacon or rotor plate. I'
Author: Chuck Tifft via TowerTalk <towertalk@contesting.com>
Date: Tue, 12 Aug 2014 08:58:56 -0700
Hello List, Just acquired never assembled EF-240. However no paperwork was with it. I am not even sure if all the parts are there although it appears that most of it is there. Anybody got a manual (p
Author: Chuck Tifft via TowerTalk <towertalk@contesting.com>
Date: Tue, 12 Aug 2014 13:08:32 -0700
Thanks to all who have replied, I have gotten a couple files and should have the info I need. Again thanks to all. 73's Chuck W6RD _______________________________________________ ____________________
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Thu, 14 Aug 2014 16:05:40 -0400 (EDT)
I found out today that Fedex want ~$400 to ship a Rohn 25 part. Knowing that I can buy that for ~$120 I found that unreasonable to say the least. Does anyone have any suggestion how to arrange a ship