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Total 31 documents matching your query.

1. Re: [TowerTalk] Site Elevation and TOA (score: 1)
Author: "John Langdon" <>
Date: Wed, 18 Jun 2014 04:48:37 -0500
The only way to really know is to run the numbers for the location. I am blessed with a sloping foreground in most directions: some out to about 4 miles, some out to 14 miles, and the resulting radia
/archives//html/Towertalk/2014-06/msg00155.html (14,172 bytes)

2. Re: [TowerTalk] Site Elevation and TOA (score: 1)
Author: "John Langdon" <>
Date: Thu, 19 Jun 2014 19:16:46 -0500
The verticals suffer more from poor ground conductivity especially at low radiation angles (Pseudo-Brewster angle etc.) so they seem even better in a good location, but the yagis and quads do better
/archives//html/Towertalk/2014-06/msg00184.html (9,718 bytes)

3. Re: [TowerTalk] 10 throu 20 beam traps or no traps (score: 1)
Author: "John Langdon" <>
Date: Fri, 20 Jun 2014 11:17:56 -0500
IMHO quads very good antennas - they are very cost effective, they do hear a little better and are a little quieter, but, you should live in an area with no icing issues and have a tilt over crank up
/archives//html/Towertalk/2014-06/msg00203.html (15,438 bytes)

4. Re: [TowerTalk] 10 throu 20 beam traps or no traps (score: 1)
Author: "John Langdon" <>
Date: Sun, 22 Jun 2014 18:55:16 -0500
IMHO the 34 and 36, if restored to original working order, are a much better choice that the "pro" models. 73 John N5CQ Actually, I was mistaken - it is a Mosely Classic 36. I went out and spread eve
/archives//html/Towertalk/2014-06/msg00262.html (11,000 bytes)

5. Re: [TowerTalk] Screw Anchor "Tripleye" Heads (score: 1)
Author: "John Langdon" <>
Date: Wed, 25 Jun 2014 16:47:57 -0500
The Chance anchors are widely used, but are usually put in by one of their installers, who sample the soil and twist the anchors in and have the equipment to confirm the calculated holding strength i
/archives//html/Towertalk/2014-06/msg00295.html (12,530 bytes)

6. Re: [TowerTalk] How to run HFTA v1.04 under Windows 8.1? (score: 1)
Author: "John Langdon" <>
Date: Fri, 18 Jul 2014 16:02:55 -0500
Try running as administrator if your normal user login does not have administrator privileges. 73 John N5CQ Runs just fine on my Windows 8.1/64 system(s). I don't remember needing to do anything spec
/archives//html/Towertalk/2014-07/msg00127.html (10,147 bytes)

7. Re: [TowerTalk] modeling compare: 80M, 2EL vs 4SQ (score: 1)
Author: "John Langdon" <>
Date: Mon, 16 Mar 2015 20:44:57 -0500
Ground conductivity is always important! If you have very poor soil conductivity, a vertical (or four or more of them) on silver plated copper disks a wavelength in radius still won't get out that we
/archives//html/Towertalk/2015-03/msg00174.html (11,081 bytes)

8. [TowerTalk] Antenna Heights, Stacking, and Siting (score: 1)
Author: "John Langdon" <>
Date: Thu, 16 Apr 2015 12:38:46 -0500
I have done lots of HFTA modeling and have years of experience and thousands of hours listening to and switching combinations of stacked yagis on HF. Here are my (primarily W5 area based) stacking ru
/archives//html/Towertalk/2015-04/msg00424.html (11,419 bytes)

9. Re: [TowerTalk] Rotating tower guying question (score: 1)
Author: "John Langdon" <>
Date: Sun, 3 May 2015 20:55:07 -0500
You always want to use EHS for several feet near the tower (falling tools, antennas, etc.) and near the ground (grassfires, vandals, etc.). To be sure there are no issues with electrical interactions
/archives//html/Towertalk/2015-05/msg00006.html (9,147 bytes)

10. Re: [TowerTalk] FW: ASSEMBLING A WIND TOWER (score: 1)
Author: "John Langdon" <>
Date: Sun, 7 Jun 2015 17:27:03 -0500
A lot of the smaller installers use the screw in anchors (AB Chance, etc.) because you do not have to wait for concrete to cure. 73 John N5CQ Only two days to cure concrete! Barry, W5GN https://www.y
/archives//html/Towertalk/2015-06/msg00097.html (8,396 bytes)

11. Re: [TowerTalk] JK Navassa-5 (score: 1)
Author: "John Langdon" <>
Date: Sun, 4 Oct 2015 07:30:40 -0500
The C3 and C3S both had a very high performance to wind load ratio, and were good for 20+ years with no maintenance required. 73 John N5CQ IMHO for a high performance well built antenna the Force 12
/archives//html/Towertalk/2015-10/msg00016.html (15,049 bytes)

12. Re: [TowerTalk] Max antenna weight (score: 1)
Author: "John Langdon" <>
Date: Tue, 10 Nov 2015 05:11:03 -0600
I used HDR300s for years, setup with a 2:1 gears to turn rotating towers, including the add on limit switches. In this application antenna weight and balance did not matter. Inertia and holding torqu
/archives//html/Towertalk/2015-11/msg00113.html (12,427 bytes)

13. Re: [TowerTalk] Verticals and well pipe grounding (score: 1)
Author: "John Langdon" <>
Date: Tue, 9 Feb 2016 04:47:25 -0600
Also there is an averaging area dimension for the map - I don't remember what it is - but any given soil in an area of less than that size, can vary quite a bit from the map values. 73 John N5CQ And
/archives//html/Towertalk/2016-02/msg00090.html (9,604 bytes)

14. Re: [TowerTalk] AES SK (score: 1)
Author: "John Langdon" <>
Date: Sat, 9 Jul 2016 20:21:04 -0500
I concur. I have been involved in several big money 'where to build it' decision trees and the big two overarching factors were usually (1) how much uncertainty (time and chance of success) about get
/archives//html/Towertalk/2016-07/msg00244.html (19,998 bytes)

15. Re: [TowerTalk] 20m stack switching question (score: 1)
Author: "John Langdon" <>
Date: Thu, 14 Jul 2016 05:04:54 -0500
I have had several stacked antenna systems since 1997 - a six stack of tri-banders, some three and two stacks of mono-banders, and a three stack of OWA's on 40. I have usually been able to switch all
/archives//html/Towertalk/2016-07/msg00303.html (12,081 bytes)

16. Re: [TowerTalk] 6-meter antenna height (score: 1)
Author: "John Langdon" <>
Date: Sun, 31 Jul 2016 04:57:23 -0500
I have only been on 6M for the last few years. I have one yagi at 195' and another at 65' (on two different towers), and often notice dramatic differences between the two, with the relative signal st
/archives//html/Towertalk/2016-07/msg00584.html (9,990 bytes)

17. Re: [TowerTalk] 6M antenna height (score: 1)
Author: "John Langdon" <>
Date: Sun, 31 Jul 2016 18:54:11 -0500
As I understand it, HFTA statistically does not account for sporadic E hops, so it's usefulness for 6M may be in question. I learned for USA domestic F2 propagation on 20-15-10 with my sloping foregr
/archives//html/Towertalk/2016-07/msg00597.html (8,094 bytes)

18. Re: [TowerTalk] Yagis in the WInd? (score: 1)
Author: John Langdon <>
Date: Tue, 12 Dec 2017 22:06:24 +0000
This is the only easy web link I can find for some of Dick Weber's "yagis in the win"d analysis: 73 John N5CQ<ht
/archives//html/Towertalk/2017-12/msg00168.html (9,586 bytes)

19. Re: [TowerTalk] Where Do I go? (score: 1)
Author: "John Langdon" <>
Date: Fri, 2 Feb 2018 06:28:10 -0600
One lesson from hard experience: find out which covenants and restrictions are actually filed at the courthouse for the specific parcel you are interested in. Never depend on what a realtor or salesp
/archives//html/Towertalk/2018-02/msg00014.html (11,764 bytes)

20. Re: [TowerTalk] Guy anchors for AB-577 (score: 1)
Author: "John Langdon" <>
Date: Wed, 21 Feb 2018 19:50:39 -0600
We used to use these for installing small wind turbines (2500 pounds and 8+ meter blades turning at 100+ rpm with significant projected area, see for deta
/archives//html/Towertalk/2018-02/msg00261.html (11,606 bytes)

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