Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Mon, 6 Oct 2014 17:05:00 -0400
I just joined Tower Talk -- I've read through the last 5 years of archives Yikes. My condolences - hi. LOTS of info there. And welcome to TowerTalk. Cheers, Steve K7LXC _____________________________
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 7 Oct 2014 12:19:49 -0400
Towers. Regarding the orientation of the T-base.....he said that the strength of the tower will be about the same in all directions, and suggested I just orient the base so that laying the tower dow
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 7 Oct 2014 14:46:51 -0400
Rohn 55 tower mounted on top of a building. The top of the tower is 100 feet above the street. very well. I am planning to place a Force 12 Delta 230/240 above the XR-5 on the same mast. They will b
Author: Dan Maguire via TowerTalk <towertalk@contesting.com>
Date: Wed, 8 Oct 2014 01:09:30 -0700
If a "shortening factor" is defined as the ratio between the height of a resonant grounded vertical and a free space quarter wavelength, the following curves show the factors for 3.75 MHz and 28.5 MH
Author: Dan Maguire via TowerTalk <towertalk@contesting.com>
Date: Wed, 8 Oct 2014 01:13:37 -0700
It's also possible to use one of the Leeson spreadsheets that John mentioned to calculate the resonant length for half-wave dipoles and quarter-wave grounded verticals, although not for other antenna
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 8 Oct 2014 13:19:21 -0400
Dear Ham Friends, Recently I checked my feed lines to my tower. I have 1" hardlines, each 88 feet long. I checked the loss by measuring the SWR at various frequencies. (~0.8dB @150MHz) I decided to a
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Wed, 8 Oct 2014 16:33:28 -0400
Hans, I have seen foam filled hardline with velocity factors in that range. Your loss test shows that the cable is ok. 73, Gerald K5GW In a message dated 10/8/2014 10:19:35 A.M. Pacific Daylight Time
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 8 Oct 2014 22:17:51 -0400
Thank you, guys, for all information. It seems as the cable is OK and that the Vf is within range. 73 de, Hans - N2JFS Hans, I have seen foam filled hardline with velocity factors in that range. Your
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Mon, 13 Oct 2014 16:37:09 -0400
The last issue of QST, Nov 2014 has an article about magnetic loops. Check that out. It looks like a good way to design magnetic loops (with some electric fields added.) Hans - N2JFS --Original Messa
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 14 Oct 2014 11:17:57 -0400
If you're interested in a real, on-the-air HF vertical report, check out our Vertical Comparison Report. It's got lots of info including protocol and ota results. Available from championradio.com. C
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 14 Oct 2014 11:23:14 -0400
Thanks for all the input everyone. It looks like epoxy, or at least commercial grade stuff dispensed with a caulking gun is out as a potential solution. It seems like the holes I made are too big. S
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 14 Oct 2014 11:37:26 -0400
bolted to the base plate. Some time over the past decades, dirt fell down a slope and covered the base plate and the bottom bit of tower (less on one leg than the other two). Near the surface I can
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 14 Oct 2014 11:40:15 -0400
to just embed the whole bottom in concrete, rendering the condition of the plate and the bottom foot of the section irrelevant. Ah - a great solution. And a lot less work too! Cheers, Steve K7LXC TO
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Tue, 14 Oct 2014 11:54:30 -0400
get it back up to grade. The base pin and plate is a far better way to do it than the typical Hammy Hambone method of burying the bottom section of tower in the concrete. You want the tower to be ab
Author: mike repinski via TowerTalk <towertalk@contesting.com>
Date: Wed, 15 Oct 2014 08:02:33 -0400
This might be costly but could you have some 2 1/2 sleeves made up and use your original bolts? Some 2 1/2 inch diameter rod drilled to accept your bolts and welded in. This recommendation fits with
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Wed, 15 Oct 2014 08:03:25 -0400
How about larger anchor bolts with upper six inches or so machined to fit the base holes? Could the base holes be reamed to a larger size? K5GW In a message dated 10/15/2014 12:09:54 A.M. Central Day
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 15 Oct 2014 23:26:25 -0400
If you look carefully at the picture you'll see that each bracket has a U-bolt grabbing the Z rod, thereby spreading the load to all three legs. I used (a home made) plate with three holes, one for e
Author: Bill via TowerTalk <towertalk@contesting.com>
Date: Fri, 17 Oct 2014 12:38:17 -0400
I agree with John on the mechanical issues, but want to add one comment. I have used tribanders about 10 feet from 40 meter beams and from my experience there is little interaction...except on 15. Yo
Author: GALE STEWARD via TowerTalk <towertalk@contesting.com>
Date: Fri, 17 Oct 2014 10:06:27 -0700
My TH6 and 40-2CD ended up being 9 feet apart. The 40M is on top. This setup has worked great for some years. GL with the project. 73, Stew K3ND My tower is a US Tower HDX-555. I'm planning to stack