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21. [TowerTalk] Why a Prop Pitch? (score: 1)
Author: NPAlex@aol.com
Date: Wed, 24 Jan 2007 18:16:31 EST
It appears that I may have started this thread with my response to "Why a prop pitch" I guess I need to make additional comment. Maybe standard components as has been described in the other emails wi
/archives//html/Towertalk/2007-01/msg00687.html (11,494 bytes)

22. [TowerTalk] prop pitch rotors (score: 1)
Author: NPAlex@aol.com
Date: Mon, 12 Mar 2007 22:39:13 EDT
Rob, First the prop pitch motor is a 24-28 v motor and will run close to 1rpm at those voltages. The brake is energized when sufficient current passes through the coil. But it is recommended to remov
/archives//html/Towertalk/2007-03/msg00189.html (8,932 bytes)

23. [TowerTalk] Positive pull down (score: 1)
Author: NPAlex@aol.com
Date: Fri, 6 Apr 2007 13:24:01 EDT
Rob, Positive "pull-down" is a feature on the Tri-EX LM-470 series towers. The key to this technique is a cable drum wide enough to hold cable for the LIFT side and the DWN side cables. The "Lifting"
/archives//html/Towertalk/2007-04/msg00148.html (9,358 bytes)

24. [TowerTalk] Measuring Stubs (score: 1)
Author: NPAlex@aol.com
Date: Wed, 11 Apr 2007 23:15:35 EDT
Tom, My experience says that measuring a stub is best when the expected R=0, Therefore you want to leave the cable open for quarter wave length as it reflects Low Z at the feed end. The same length c
/archives//html/Towertalk/2007-04/msg00225.html (7,238 bytes)

25. [TowerTalk] 135deg cable (score: 1)
Author: NPAlex@aol.com
Date: Tue, 17 Apr 2007 07:36:24 EDT
Tom, Two methods, determine what length a 1/4 wave (90 deg) @ 7mHz is, and then add one half that value for the total length ( 90 deg. + 45 deg= 135 deg). Or measure at 2X the 40m frequency (20m), an
/archives//html/Towertalk/2007-04/msg00303.html (7,233 bytes)

26. [TowerTalk] Tower problem (score: 1)
Author: NPAlex@aol.com
Date: Fri, 20 Apr 2007 20:44:01 EDT
My observation and comment on the symptom of a tower not raising when power applied, but after a slight down run it will lift. I have had two TriEX LM470's, and now a US Tower HD589 and they have all
/archives//html/Towertalk/2007-04/msg00403.html (8,555 bytes)

27. [TowerTalk] US tower Mast Raising Fixture (score: 1)
Author: NPAlex@aol.com
Date: Tue, 1 May 2007 12:38:16 EDT
The mounting is pretty straight forward. The long rectangular tube section mounts on the rear tab, and the two support braces connect about mid point (near winch) and bolt onto the front mounting tab
/archives//html/Towertalk/2007-05/msg00012.html (6,824 bytes)

28. [TowerTalk] Adding 6m to a Quad (score: 1)
Author: NPAlex@aol.com
Date: Tue, 8 May 2007 23:07:18 EDT
Jim, In planning the addition of 6m to a 3 element quad you have several issues to resolve. First, element spacing is in the 30" to 40" range, so additional element supports will have to be added in
/archives//html/Towertalk/2007-05/msg00106.html (7,822 bytes)

29. [TowerTalk] Antenna Relay - (score: 1)
Author: NPAlex@aol.com
Date: Sat, 12 May 2007 12:48:34 EDT
With regard to choice of conventional "clapper" type relay to use for RF circuits note there are several considerations to be evaluated. Power handling, RF Voltages/Currents and Frequency. Below 30 m
/archives//html/Towertalk/2007-05/msg00230.html (10,102 bytes)

30. [TowerTalk] Rope For Sale (score: 1)
Author: NPAlex@aol.com
Date: Mon, 21 May 2007 12:39:44 EDT
Several weeks ago someone, I believe it was on this list, had a hank of 300 feet pf rope for sale. HELP. I need some good rope. RoGrrr 614-554-4067 - cell == Roger, I have a 300ft spool of high quali
/archives//html/Towertalk/2007-05/msg00495.html (6,630 bytes)

31. [TowerTalk] Choice of material for Mast (score: 1)
Author: npalex@aol.com
Date: Fri, 01 Jun 2007 10:15:27 -0400
The question was asked about the differences in Aluminum tubing and aluminum pipe. The answers that followed in some cases indirectly answered the question and in other cases also illuminated other d
/archives//html/Towertalk/2007-06/msg00008.html (12,914 bytes)

32. [TowerTalk] Pipe dimensioning (score: 1)
Author: npalex@aol.com
Date: Wed, 06 Jun 2007 15:21:07 -0400
Bill, Thanks for the addition of a more precise descriptor of the dimension being refered to. However given the context of the original statement I think the reference is clear that if tubing sizesde
/archives//html/Towertalk/2007-06/msg00114.html (7,438 bytes)

33. [TowerTalk] SteppIR problem (score: 1)
Author: NPAlex@aol.com
Date: Mon, 11 Jun 2007 00:33:54 EDT
Bill, Given that you have a 500 ft run, the first thing I would do is take the controller out to the base of the tower where the cable length is more typical and see if all works well then. If so, ru
/archives//html/Towertalk/2007-06/msg00228.html (11,703 bytes)

34. [TowerTalk] Quad Wire (score: 1)
Author: NPAlex@aol.com
Date: Tue, 19 Jun 2007 08:35:00 EDT
20 meter 6 El Quad project? What are most people using for their Quads? Jack KZ4USA == Jack, use. Regards, Norm W4QN ** See what's free at http://www.aol.com. ________________________________________
/archives//html/Towertalk/2007-06/msg00614.html (7,137 bytes)

35. [TowerTalk] Telrex Monoband matching (score: 1)
Author: NPAlex@aol.com
Date: Sun, 1 Jul 2007 23:29:18 EDT
Paul, Additional comment on matching your TELREX mono band beams. Regarding the two comments below, the Mono-bands did use a Tee matching system set for about 50 ohms impedence. This system was feed
/archives//html/Towertalk/2007-07/msg00040.html (9,300 bytes)

36. [TowerTalk] Telrex Monoband matching (score: 1)
Author: NPAlex@aol.com
Date: Mon, 2 Jul 2007 11:52:17 EDT
Paul, I think you will find that the Coax BalUn cable length is 1/2 wL to get a 180deg phase shift and create the "balanced" feed. When the voltage is "high" on terminal 1, it is "LOW" on terminal 2
/archives//html/Towertalk/2007-07/msg00070.html (7,709 bytes)

37. [TowerTalk] US ANTENNA MFG (score: 1)
Author: NPAlex@aol.com
Date: Tue, 3 Jul 2007 21:15:27 EDT
Rusty, There are several who fabricate and source their components here in the USA.. One that comes to mind is Cubex Quad Antennas, and I think the Tennadyne LPA are all US made. Norm W4QN == -- Orig
/archives//html/Towertalk/2007-07/msg00168.html (7,859 bytes)

38. [TowerTalk] Restoring a Tristao CZ-454 Tower (score: 1)
Author: NPAlex@aol.com
Date: Thu, 5 Jul 2007 18:26:46 EDT
Neil, When dealing with crank-up towers you have to remember the various sections move as a "system". This means if you shorten a section, that new length determines the extended length of each other
/archives//html/Towertalk/2007-07/msg00246.html (8,971 bytes)

39. [TowerTalk] Restoring a Tristao CZ-454 Tower (score: 1)
Author: NPAlex@aol.com
Date: Thu, 5 Jul 2007 21:14:20 EDT
Neil, One thing I forgot mention is the substitute tower section needs to be reinforced in one area. The high stress point on the extended tower sections is near the bottom where it exits the previou
/archives//html/Towertalk/2007-07/msg00255.html (9,379 bytes)

40. [TowerTalk] Woodpecker - (score: 1)
Author: NPAlex@aol.com
Date: Thu, 12 Jul 2007 00:08:33 EDT
Stew, Woodpeckers are very territorial and they often mark their territory by finding something that makes the maximum noise when they do a hammer job on it. Popular objects are Gutters, and metal Ch
/archives//html/Towertalk/2007-07/msg00514.html (7,780 bytes)


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