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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+Recommendation\s+for\s+mast\s+on\s+bottom\s+mount\s+rotator\s*$/: 24 ]

Total 24 documents matching your query.

1. [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Bill Turner <dezrat@copper.net>
Date: Sat, 16 Sep 2006 08:24:19 -0700
I'm going to move my rotator to the bottom of my 80 foot tower and would like recommendations for the mast. I will support it at the top with a thrust bearing, and at least one, possibly two, non-thr
/archives//html/Towertalk/2006-09/msg00564.html (7,996 bytes)

2. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 16 Sep 2006 11:46:34 -0400
Remember this mast has to do basically what the top mast does. It is one long torsion bar. That and with a thrust bearing at the top the tower will end up supporting all the extra weight of the mast
/archives//html/Towertalk/2006-09/msg00565.html (9,021 bytes)

3. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "Marc Wullaert ON4MA" <marc.wullaert3@pandora.be>
Date: Sat, 16 Sep 2006 15:53:22 -0000
Better to use flenses to couple the mast .Drill and pin have to be correct otherwise that hole in 1 year will be bigger from friction.if you need some photos how whe do it here let me know Marc on4ma
/archives//html/Towertalk/2006-09/msg00567.html (9,450 bytes)

4. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Sat, 16 Sep 2006 08:58:34 -0700
So the idea is that the drive shaft only has to carry the torque load (and its own weight)? You've got a thrust bearing at the top to take the downforce of the antenna and its mast. You've got two qu
/archives//html/Towertalk/2006-09/msg00568.html (9,574 bytes)

5. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Sat, 16 Sep 2006 09:12:10 -0700
K8RI made a good point.. I assumed that you'd have another thrust bearing at the bottom to hold the weight of the torque tube. If not, then the entire weight of the tube will also be on your top thru
/archives//html/Towertalk/2006-09/msg00569.html (10,492 bytes)

6. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "Don Moman VE6JY" <ve6jy@3web.com>
Date: Sat, 16 Sep 2006 16:07:21 -0000
For your application I'd use 1.5 IPS Sked 40 water pipe (1.9" OD) with the 4 bolt flanges (usually weld on) to couple them. Drilling/pinning is a potential problem area for wear in the years down the
/archives//html/Towertalk/2006-09/msg00572.html (9,275 bytes)

7. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 16 Sep 2006 16:17:08 -0400
At our last swap there was a guy selling Aluminum tubing, boom to mast clamps, and mast coupling/clamps. The couplings were sizeable and appeared to be very rugged. At something in the order of the
/archives//html/Towertalk/2006-09/msg00573.html (11,686 bytes)

8. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Bill Turner <dezrat@copper.net>
Date: Sun, 17 Sep 2006 08:58:02 -0700
On Sat, 16 Sep 2006 09:12:10 -0700, Jim Lux <jimlux@earthlink.net> wrote: <snip> How would you get the weight evenly spread between the two thrust bearings? It would seem to me that one or the other
/archives//html/Towertalk/2006-09/msg00589.html (9,717 bytes)

9. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Sun, 17 Sep 2006 09:41:30 -0700
I would use some sort of spline coupling between torque tube and antenna mast. Perhaps not an actual spline, but something that works similarly. Depending on the amount of length variation, one of th
/archives//html/Towertalk/2006-09/msg00592.html (12,002 bytes)

10. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 17 Sep 2006 17:52:09 -0400
This isn't a great deal different, if any, than a thrust bearing on top with the rotator on the bottom as the rotator serves as a weight supporting thrust bearing. I would think for bottom mounted r
/archives//html/Towertalk/2006-09/msg00600.html (16,313 bytes)

11. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Jim Lux <jimlux@earthlink.net>
Date: Sun, 17 Sep 2006 15:23:10 -0700
bottom of tube has female spline, top has male, so water will tend to shed. I suspect that in a real application, though, it would tend to rust, cold-weld, gall, etc. Exactly.. they're just there to
/archives//html/Towertalk/2006-09/msg00604.html (14,614 bytes)

12. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: ersmar@comcast.net
Date: Sun, 17 Sep 2006 22:30:59 +0000
TT: I have several of those mast sections and the bottom of the next upper section is smooth. That is, the splines from the lower section do NOT engae matching splines above them. See http://cgi.ebay
/archives//html/Towertalk/2006-09/msg00605.html (9,627 bytes)

13. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "Dale Martin" <kg5u@hal-pc.org>
Date: Sun, 17 Sep 2006 23:46:50 -0500
I thought the purpose of a thrust bearing was to stabilize the mast horizontally and not to take the weight of the mast/antenna array off the rotator. The set screws are adjusted to remove 'wobble'
/archives//html/Towertalk/2006-09/msg00618.html (9,508 bytes)

14. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "Mike, K6BR" <noddy1211@sbcglobal.net>
Date: Sun, 17 Sep 2006 22:00:30 -0700
It takes the weight of whatever is resting on it; in my case it takes the weight of the tower and antenna. A thrust bearing is also used in a manual transmission to separate the clutch plates. I thou
/archives//html/Towertalk/2006-09/msg00619.html (11,069 bytes)

15. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: Eugene Jensen <eugenejensen@nyc.rr.com>
Date: Mon, 18 Sep 2006 01:47:37 -0400
Rigid aluminum conduit would work real nice and more than strong enough for a 1 RPM app like this. This would be light weight in 2 inch and easy to find in most large electrical supply houses. Come i
/archives//html/Towertalk/2006-09/msg00622.html (9,885 bytes)

16. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 18 Sep 2006 05:24:51 -0400
Many commercial bearings just don't work that way. The ROHN TB-3 and 4 as well as the Yaesu would be difficult to install in the normal manner without them supporting weight. Both have an upper and
/archives//html/Towertalk/2006-09/msg00626.html (10,560 bytes)

17. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: K7LXC@aol.com
Date: Mon, 18 Sep 2006 22:44:08 EDT
long torsion bar. That and with a thrust bearing at the top the tower will end up supporting all the extra weight of the masting. Umm, I'll go with the long torsion bar. BTW, mounting antennas altern
/archives//html/Towertalk/2006-09/msg00675.html (9,826 bytes)

18. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Tue, 19 Sep 2006 14:15:45 -0400
That is one of those, "it all depends" on many factors including the wind at various heights at any given moment. There is no gurantee the torque from those antennas will cancel out. Although multipl
/archives//html/Towertalk/2006-09/msg00698.html (12,106 bytes)

19. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Tue, 19 Sep 2006 21:50:01 -0500
What do you mean by "mounting antennas alternately up a mast"? Pointing them at 90 degrees to each other? 73 Gary K4FMX _______________________________________________ ______________________________
/archives//html/Towertalk/2006-09/msg00716.html (9,925 bytes)

20. Re: [TowerTalk] Recommendation for mast on bottom mount rotator (score: 1)
Author: "Mike Fatchett" <mike@mallardcove.com>
Date: Tue, 19 Sep 2006 20:53:48 -0600
Mounting one antenna on one side of the mast and the next on the opposite side etc so the boom to mast clamps alternate. Mike W0MU What do you mean by "mounting antennas alternately up a mast"? Point
/archives//html/Towertalk/2006-09/msg00717.html (10,449 bytes)


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