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61. [TowerTalk] Best mast location? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 14 May 2010 04:42:04 -0700
It more than likely has to do with things not related to antennas or even towers at all. It's far less expensive to use standard stock lengths of material. IOW tube, angle, and flat stock, comes in 2
/archives//html/Towertalk/2010-05/msg00277.html (14,213 bytes)

62. [TowerTalk] Anchor rods, 55 vs 105 ksi ?? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 14 May 2010 05:46:17 -0700
The 'new' spec for anchor rods is called ASTM- F1554. They come in 36/55/105 ksi. The original spec for my HDX-689 used A36 anchor bolts [1.25" x 36" long x 36 ksi] The 689 never used 1.25" anchor bo
/archives//html/Towertalk/2010-05/msg00279.html (9,926 bytes)

63. [TowerTalk] Best mast location? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 15 May 2010 05:26:02 -0700
For various reasons (some inherent in bearing manufacturing tolerances) three spaced bearings are almost never done in machinery - it's just too hard to get them/keep them aligned. Two bearings can h
/archives//html/Towertalk/2010-05/msg00293.html (11,583 bytes)

64. [TowerTalk] FW: Thrust Bearing - again! (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 19 May 2010 04:50:52 -0700
A more accurate URL to this bearing, below, is http://www.peerbearing.com/pdf/MUD/2-Bolt%20Flanges.pdf These are very similar to what Us tower uses. The eccentric locking collar used on the US tower
/archives//html/Towertalk/2010-05/msg00385.html (10,805 bytes)

65. [TowerTalk] thrust bearings (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 19 May 2010 05:38:26 -0700
The TB-3 (and TB-4) are both aluminum races with steel ball bearings. It is very common for older TB's to have the rumbling you describe since in wind gusts, the steel bearings can get pounded into t
/archives//html/Towertalk/2010-05/msg00387.html (8,204 bytes)

66. [TowerTalk] thrust bearing lubrication (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 19 May 2010 07:00:09 -0700
I use Moly grease on all of mine, no problems yet. Every bearing needs lubrication, even old windmills from 100 years ago have oilers, and windmills only turn at about 75 rpm. Where I live dust and d
/archives//html/Towertalk/2010-05/msg00389.html (10,599 bytes)

67. [TowerTalk] BN-86 Balun (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 19 May 2010 13:17:43 -0700
I believe the answer is simple. It has to be cheap (not expensive) for the ham market. A quality product can be made but those that would spend the extra cash are too few thus making the product even
/archives//html/Towertalk/2010-05/msg00394.html (9,680 bytes)

68. [TowerTalk] Baluns/tutorial/notes. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 21 May 2010 08:06:59 -0700
Strong words, Jim but you are right on. Type 31 material is easily available from Mouser (no minimum order size) and other electronic parts houses. Poor baluns, even if they do not fail with legal po
/archives//html/Towertalk/2010-05/msg00468.html (14,703 bytes)

69. [TowerTalk] Mast steps (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 21 May 2010 08:14:13 -0700
I'm going to make some mast steps from 14" long pieces of 2" x 2" x 1/4" thick 6061-T6 I have been told that a SINGLE dx eng saddle clamp will suffice... and handles the weight of a 250 lb man. The d
/archives//html/Towertalk/2010-05/msg00470.html (7,346 bytes)

70. [TowerTalk] Mast steps. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 22 May 2010 03:48:09 -0700
Date: Fri, 21 May 2010 15:44:53 -0500 From: "Jim McDonald" <jim@n7us.net> Subject: Re: [TowerTalk] Mast Steps I have steps from W9IIX too, and they replaced homebrew ones. I didn't find pictures on t
/archives//html/Towertalk/2010-05/msg00494.html (9,779 bytes)

71. [TowerTalk] Optimium Tower Height (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 22 May 2010 05:08:12 -0700
This is also the advice I was given 15 years ago by a very well-known and technically accomplished local multi-multi owner - he said if you only plan one tower, make it 100 feet. I altered my plans a
/archives//html/Towertalk/2010-05/msg00498.html (10,649 bytes)

72. [TowerTalk] Baluns/tutorial/notes. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 22 May 2010 07:11:05 -0700
Considerable experience has shown that this is a good target for noise pickup. In my analysis, I also showed that a very high value has the additional benefit of minimizing dissipation. Since I first
/archives//html/Towertalk/2010-05/msg00507.html (13,151 bytes)

73. [TowerTalk] Baluns/tutorial/notes. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 23 May 2010 07:01:52 -0700
Yes, you're wrong. :) #61 is a poor core material, because its Q is too high. For all the reasons discussed in my tutorial, we want RESISTANCE, not reactance, and we want it to be as broadband as pos
/archives//html/Towertalk/2010-05/msg00549.html (10,768 bytes)

74. [TowerTalk] Optimium Tower Height (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 23 May 2010 07:10:17 -0700
This is also the advice I was given 15 years ago by a very well-known and technically accomplished local multi-multi owner - he said if you only plan one tower, make it 100 feet. I altered my plans a
/archives//html/Towertalk/2010-05/msg00550.html (10,698 bytes)

75. [TowerTalk] Warning text (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 26 May 2010 19:30:19 -0700
I would be careful what you put on your Tower, especially if it implies that there is a danger and you will be injured if touched or you are nearby. Apparently "Beware of the Dog" on your gate, gets
/archives//html/Towertalk/2010-05/msg00641.html (9,142 bytes)

76. [TowerTalk] painting DOM (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 28 May 2010 01:55:44 -0700
I have three sections of 2" OD DOM to paint. Two sections will be spliced in the 45G and run through two sleeve bearings above the rotator which will support all the weight. The paint needs to be rea
/archives//html/Towertalk/2010-05/msg00670.html (9,829 bytes)

77. [TowerTalk] Lightning suppression through coax loops (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 28 May 2010 02:13:35 -0700
I bought an Ameritron RCS-10 antenna switch at Dayton, and in reading the manual (please, no giggling) I note that it calls for a two-turn loop in each antenna coax line just before entering the rela
/archives//html/Towertalk/2010-05/msg00671.html (10,684 bytes)

78. [TowerTalk] correct e-mail for cal-av labs (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 31 May 2010 04:29:32 -0700
You can probably get the balun spec from Cal-Av Labs directly. They have moved to Tucson, AZ. Send your enquiry to info@calav.com. 73, Dennis K6IFB later... Jim VE7RF ________________________________
/archives//html/Towertalk/2010-05/msg00716.html (7,070 bytes)

79. [TowerTalk] Type 31 baluns (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 31 May 2010 06:54:14 -0700
Apparently array solutions is now using type 31 material for their w1JR style baluns. The original stacked cores used type 61 material. Both the new style and the old style use several wraps of RG-39
/archives//html/Towertalk/2010-05/msg00719.html (9,090 bytes)

80. [TowerTalk] HG52-ss cable (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 31 May 2010 15:30:51 -0700
Stainless Steel cable is not as strong, probably why it is not recommended. You can get cable made up for you at Wire Rope and Rigging place, most Cities have one, because they supply the local Crane
/archives//html/Towertalk/2010-05/msg00728.html (8,062 bytes)

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