Author: David Gallatin via TowerTalk <towertalk@contesting.com>
Date: Sat, 25 Oct 2014 14:19:57 -0700
Hello everyone. When last we spoke I was off to dig my hole. 36×36×48. At the top I have a slope of about ten degrees to the east. I'm about done but I have not decided what, if anything to do about
Author: mike repinski via TowerTalk <towertalk@contesting.com>
Date: Sun, 26 Oct 2014 13:08:38 -0400
There are vendors that sell 4 foot long fiberglass tubes for mast's. This may work for your application. They also sell guying rings. Mike Hi guys, I work in broadband and from time to time we have c
Author: David Gallatin via TowerTalk <towertalk@contesting.com>
Date: Mon, 27 Oct 2014 00:41:13 +0000 (UTC)
I am sorry to hear that, Grant. I have to admit you lived my worst fear in digging but I finished today and had nothing more than hard dirt and some of the fattest fishing worms I ever did see to dea
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Sat, 25 Oct 2014 16:24:16 +0000 (UTC)
Try cycling the 'up limit' switch to see if anything changes. If the 'full up' light goes out, then follows the switch, it was a stuck switch that might come back but shouldn't be the cause of your
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Tue, 28 Oct 2014 14:53:31 -0400
Paul, As a general rule, when you doubling the core area, which you do when you pile two cores on top of each other, you will need only about 70% of the turn used for the single core to keep the indu
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Tue, 28 Oct 2014 21:15:55 +0000 (UTC)
Some years back, I purchased a 500' reel of Belden 9913 and used a bit here and there over the years. Now I needed four 70' runs to the base of my tower but didn't know how much 9913 remained on the
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Tue, 28 Oct 2014 23:06:50 -0400
Many cable manufacturer, especially manufacturers of better quality of cables, put a "serial number" (sort of) along the cable. You can recognize it as a running number along the cable. These numbers
Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>
Date: Wed, 29 Oct 2014 04:12:24 +0000 (UTC)
My post triggered an unexpected flurry of replies! Yes, there are various ways to measure coax lengths, both electrical lengths and physical lengths. The purpose of my post was to describe a way th
Author: Dan Maguire via TowerTalk <towertalk@contesting.com>
Date: Wed, 29 Oct 2014 11:40:47 -0700
There's an expanded explanation of this technique, with illustrations, on one of the Zplots pages. See section "Line Length via Quarter or Half-Wave Points" here: http://ac6la.com/zpapndx1.html So if
Author: Bill via TowerTalk <towertalk@contesting.com>
Date: Wed, 29 Oct 2014 16:17:27 -0400
Anyone having any info on erecting towers (permitting, restrictions etc) in any of the following countries please drop me an email. Turks Caicos (Providenciales) Sint Maarten St Lucia Antigua Costa R
Author: K7LXC--- via TowerTalk <towertalk@contesting.com>
Date: Wed, 29 Oct 2014 16:37:41 -0400
YIKES! No thank you. My question is how did they actually build it? That'd be interesting. Cheers, Steve K7LXC _______________________________________________ _______________________________________
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 29 Oct 2014 18:41:05 -0400
Yes Paul, There is a lot more to it. Usually you find that a core usable for higher frequency has a a lower u and therefor also a lower Al. More important is the "mix". The magnetic hysteresis losses
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Wed, 29 Oct 2014 21:22:22 -0400
Maybe I remember the length wrong. I am not at my shack right now. I do remember using 25 feet of coax. Do to the capacitive coupling between the turns, the Z goes down for higher frequencies. In ord
Author: TexasRF--- via TowerTalk <towertalk@contesting.com>
Date: Fri, 31 Oct 2014 12:30:33 -0400
Steve, is equivalent C something you measure or is it calculated? If measured, how do you do that? If calculated, how do you do that? Thanks, Gerald K5GW In a message dated 10/31/2014 9:10:52 A.M. Pa
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Fri, 31 Oct 2014 13:18:39 -0400
I think not only the dielectric constants around the coax shield but also the conductivity of the core influence the result. Hans - N2JFS Jim, If I wind exactly the same number of turns of the same c
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Sat, 1 Nov 2014 09:01:49 -0400
I didn't follow your discussion that well but; You should NOT ground the coax shield anywhere between the antenna and the choke, that will defeat the purpose of the choke. It's a very good idea to gr
Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Sat, 1 Nov 2014 09:03:55 -0400
The advantages of separate the cores is that you enhance the cooling. The cores will not get so hot as you allow for more air flowing past. You will increase the capacitance as you will need more wir
Author: David Gallatin via TowerTalk <towertalk@contesting.com>
Date: Sun, 2 Nov 2014 15:48:26 +0000 (UTC)
Hello all,So, I have a universal with the steel hinged base. It somehow did not occur to me to cover up the hinge area (DO THIS!) and I have just noticed a bit of concrete splashed around and onto th
Author: Matt B via TowerTalk <towertalk@contesting.com>
Date: Sun, 2 Nov 2014 12:35:19 -0800
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Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>
Date: Sun, 2 Nov 2014 19:48:28 -0500
Sorry Jim, You are right about the generated heat. I was more thinking about it from an electrical point-of-view. Connecting the shields on each side of the choke with each other will defeat the purp