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Total 362 documents matching your query.

1. Re: [TowerTalk] How much? (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Mon, 2 Nov 2009 08:19:40 -0500
If you go the bag mix route -- rent a small mixer from your nearest home improvement store. These typically hold two bags of mix (along with 7/8 gallon of water per bag). You can mix two bags in a co
/archives//html/Towertalk/2009-11/msg00024.html (7,409 bytes)

2. Re: [TowerTalk] House bracket insulator for noise (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Sun, 1 Nov 2009 16:18:40 -0500
Sorry for responding to such an old message. I've had 44 feet of Rohn 25 housebracketed for eight years now. It is right at the corner of my house, bracketed to the top of the wall where my bedroom i
/archives//html/Towertalk/2009-11/msg00023.html (8,026 bytes)

3. Re: [TowerTalk] Cushcraft A4 VSWR curves (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Sun, 1 Nov 2009 15:10:04 -0500
Elements too long, or, antenna too close to the ground (or other large conductive objects), or, faulty mis-tuned traps. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Web: http://boringhamradiopar
/archives//html/Towertalk/2009-11/msg00022.html (7,713 bytes)

4. Re: [TowerTalk] R7000 (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Mon, 15 Jun 2009 08:26:36 -0400
I have an R7000 mounted only 8 feet high. A couple of years ago, I added eight 12 foot radials from the base of the support mast across the ground. I found that this improved the reception of the ant
/archives//html/Towertalk/2009-06/msg00372.html (7,703 bytes)

5. Re: [TowerTalk] Climbing and working on Rohn 25g/45g towers - (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Thu, 4 Dec 2008 08:07:10 -0500
However, in a fall arrest situation, it is unlikely that all of the arrest force occurs in the shear direction. 25G has considerably more vertical support strength. On a 200 foot 25G tower, the stati
/archives//html/Towertalk/2008-12/msg00066.html (8,459 bytes)

6. Re: [TowerTalk] CDR Rotor Control Box Compatibility (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Wed, 3 Dec 2008 21:46:50 -0500
Yeah, details, details... I think the Ham-M Series 1 and 2 aren't directly compatible with series 3, 4 and 5. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years wil
/archives//html/Towertalk/2008-12/msg00061.html (7,414 bytes)

7. Re: [TowerTalk] Beam problems A3S (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Sat, 29 Nov 2008 10:59:47 -0500
I've written to Jack about his problems, which may be the result of trying to mix the older A3 with the A743. I'm sorry to hear that he hasn't gotten it working. I've been running an A3S/A743 for abo
/archives//html/Towertalk/2008-11/msg00802.html (10,141 bytes)

8. Re: [TowerTalk] An A-3S question (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 28 Nov 2008 13:27:20 -0500
Gregg, I didn't see an answer to your question from this old message. Here are some ideas: It could be the guys are affecting the antenna. Rotate the antenna about 90 degrees and see if the SWR chang
/archives//html/Towertalk/2008-11/msg00801.html (8,802 bytes)

9. Re: [TowerTalk] CDR Rotor Control Box Compatibility (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Sat, 29 Nov 2008 12:34:44 -0500
This is, indeed, a Ham-M control box. It can be used with the Ham series of rotators, since they are all pretty much identical electrically. CATS has a history page about the CDE series of rotators -
/archives//html/Towertalk/2008-11/msg00800.html (8,128 bytes)

10. Re: [TowerTalk] How do I cut aluminum pipes? (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 28 Dec 2007 13:32:16 -0500
Fastest way to cut aluminum tubing, if you have a machine shop, is to use a band saw. With a proper blade, you can roll the tubing across the table and it cuts quickly. The second best way is to use
/archives//html/Towertalk/2007-12/msg00398.html (8,957 bytes)

11. Re: [TowerTalk] Tower Incident Survey (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Thu, 27 Dec 2007 10:09:00 -0500
I'll answer the question with a story. A local ham named Paul borrowed climbing gear and an antenna analyzer (when they were pretty new) from another local ham named Dan. Paul was very excited to cli
/archives//html/Towertalk/2007-12/msg00377.html (9,021 bytes)

12. Re: [TowerTalk] Tower ACCIDENT (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Thu, 27 Dec 2007 08:25:19 -0500
In all my years of reading Towertalk, this is the first time I've seen mention of replacing guy wires at regular intervals. How often do guy wires need to be replaced? Where in the Rohn catalog does
/archives//html/Towertalk/2007-12/msg00372.html (7,202 bytes)

13. Re: [TowerTalk] Pipe Cutters (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Sun, 9 Dec 2007 21:47:49 -0500
I've cut plenty of .058 wall Al tubing that was telescoped inside or outside other tubing. Make sure the cutter is sharp. Any burr that you have can be easily removed with a deburring tool, or with s
/archives//html/Towertalk/2007-12/msg00180.html (9,068 bytes)

14. Re: [TowerTalk] Loose rotor bolts (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 23 Nov 2007 10:14:11 -0500
For the record, though, the use of Loctite to secure a fastener is not considered sufficient for aviation use. There are only three approved methods: 1) Castellated nuts and cotter pins 2) Nyloc nuts
/archives//html/Towertalk/2007-11/msg00458.html (7,440 bytes)

15. Re: [TowerTalk] Loose rotor bolts (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 23 Nov 2007 10:10:19 -0500
You know, if bolt-loosening is a serious problem, then why not use the same technology used to hold aircraft bolts in place? Use drilled bolts, and safety-wire them? With the four bolts on an antenna
/archives//html/Towertalk/2007-11/msg00457.html (8,528 bytes)

16. Re: [TowerTalk] Installation Rohn 25G (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 23 Nov 2007 10:00:15 -0500
There's a big difference between "not guyed" and free-standing. Bracketing is another method of giving a tower vertical support. You are probably lucky that they are still standing, as 40 feet bracke
/archives//html/Towertalk/2007-11/msg00456.html (9,786 bytes)

17. Re: [TowerTalk] Installation Rohn 25G (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 23 Nov 2007 09:51:05 -0500
Several comments: 6" of gravel is more like it. Is this for a free-standing, bracketed or guyed tower? The 2x2x4 dimensions are correct for a bracketed or guyed tower. For freestanding, the base dime
/archives//html/Towertalk/2007-11/msg00455.html (10,878 bytes)

18. Re: [TowerTalk] How tall is that tower? (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Fri, 12 Oct 2007 08:08:05 -0400
For antennas, I've taken to thinking of antenna height solely in meters. For any horizontal antenna, the key dimension is the height above ground in wavelengths -- and it's hard to judge wavelengths
/archives//html/Towertalk/2007-10/msg00258.html (7,169 bytes)

19. Re: [TowerTalk] Wooden Poles;Vibrations, Vortex Shedding (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Wed, 10 Oct 2007 22:14:46 -0400
I carry a small circular slide rule in my car. It's probably 25-30 years old, a promotional item sent out by some hydraulics company. I regularly find it useful. Just today I was calculating the leng
/archives//html/Towertalk/2007-10/msg00239.html (7,653 bytes)

20. Re: [TowerTalk] 20 foot tower installation help (score: 1)
Author: Bill Coleman <aa4lr@arrl.net>
Date: Thu, 16 Aug 2007 21:37:23 -0400
This is not what the manufacturer recommends. See here: http://www.radiancorp.com/ROHNNET/rohnnet2001/catalog/pdfs/25G/25G-1.pdf Look at note #2 -- Fixed bases must be used, "Pinned" bases cannot be
/archives//html/Towertalk/2007-08/msg00459.html (8,981 bytes)

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