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Total 284 documents matching your query.

81. Re: [TowerTalk] faraday cage (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Mon, 05 Nov 2007 20:29:11 -0500
If it were me, I would not make direct connection to the well casing, assuming that there's a down-hole pump. Reason is, there could be a circular ground from RF system to power line ground, back thr
/archives//html/Towertalk/2007-11/msg00135.html (8,957 bytes)

82. [TowerTalk] Sorry, Steve (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Thu, 15 Nov 2007 18:13:38 -0500
Steve...didn't mean to send from the work account. Know you had to edit/allow the submission. Sorry abt That. Wl be more careful in future. n2ea/jim _______________________________________________ __
/archives//html/Towertalk/2007-11/msg00349.html (6,314 bytes)

83. Re: [TowerTalk] Cable feed-thru for removable cables (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Mon, 19 Nov 2007 15:12:24 -0500
Barry, EI/W5GN, asked how to seal up a 3" diameter hole, around cables, but still be able to remove them. Here's the answer: Your local ACE hardware store (probably not in EI) should stock "Electrici
/archives//html/Towertalk/2007-11/msg00403.html (7,290 bytes)

84. [TowerTalk] 80m vertical (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Mon, 26 Nov 2007 10:10:59 -0500
I'm currently running a 32' vertical in the backyard fed at the base with a 200 watt sgc tuner. Eventually I want install an amplifier so the current setup will not work. I'm considering the Steppir
/archives//html/Towertalk/2007-11/msg00489.html (8,135 bytes)

85. Re: [TowerTalk] pl259-rg6 (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Sun, 09 Dec 2007 12:46:15 -0500
Dave, I'm just about to switch over to rg6 here, and have elected to make up pigtails to go from one to the other. A compression fit rg6u will fit on rg8x, and be wxproof. I'm basically sacrificing 1
/archives//html/Towertalk/2007-12/msg00172.html (6,802 bytes)

86. Re: [TowerTalk] parallel inverted ell's (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Wed, 26 Dec 2007 09:12:36 -0500
Todd, The answer is yes. I did it in an 80/160 configuration, using 450 ohm transmission line as the lower 67'. The vertical was about 10' from a 130' pine tree, base elevated by 15' or so, with 3 el
/archives//html/Towertalk/2007-12/msg00330.html (7,823 bytes)

87. Re: [TowerTalk] Ma550 groaning (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Thu, 27 Dec 2007 13:39:55 -0500
I started writing this response, then thought better of it. Then read the latest post, and decided to contribute, despite my earlier, better judgement. First, it depends on what wench you're using to
/archives//html/Towertalk/2007-12/msg00387.html (8,150 bytes)

88. [TowerTalk] Wench vs. Winch vs. New Year's wishlist (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Sun, 30 Dec 2007 13:50:10 -0500
Irony, n, proper, a figure of speech intended to produce humorous impression, or emphasize an otherwise humorless situation, in sardonic fashion. As in, If you ask your wench to crank that tower winc
/archives//html/Towertalk/2007-12/msg00456.html (6,935 bytes)

89. [TowerTalk] AB577, AB621 (score: 1)
Author: Jim Jarvis <jimjarvis@optonline.net>
Date: Wed, 02 Jan 2008 10:34:02 -0500
TT: I have found a source of some spare parts for the military pushup masts which some know as 'rocket launchers'. It is a small company in NJ, which specializes in short run work for the military, a
/archives//html/Towertalk/2008-01/msg00025.html (6,618 bytes)

90. Re: [TowerTalk] Ferrite or choke baluns? (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Fri, 18 Jan 2008 12:42:24 -0500
<snip> If you want to do a real service to hams, stock the parts listed in Appendix 1 of my tutorial and sell them at a fair markup (not the obscene 5X markups in place for most ham vendors of ferrit
/archives//html/Towertalk/2008-01/msg00365.html (7,566 bytes)

91. [TowerTalk] halfwave slopers (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Mon, 04 Feb 2008 13:08:51 -0500
Roger, The K8UR array of sloping dipoles around a central tower does, indeed, work. You should be able to net 3dB gain out of it, with 4 antennas. The scheme of using 3/8 wave feedline to a central s
/archives//html/Towertalk/2008-02/msg00030.html (7,703 bytes)

92. [TowerTalk] R7 matching network (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Sun, 10 Feb 2008 21:04:20 -0500
Mark, The R7 is effectively a 3/8 wavelength vertical, when the loading effects of the trapped elements are considered. The matching network is intended to look at something like 200 ohms. Thus, it w
/archives//html/Towertalk/2008-02/msg00096.html (7,298 bytes)

93. Re: [TowerTalk] Grounding Coax at Tower (score: 1)
Author: jimjarvis@optonline.net
Date: Wed, 27 Feb 2008 18:27:53 +0000 (GMT)
TT:The concept of having the coax and other lines leave the tower ABOVE earth level, is alien to me.   I've always felt that the capacitance of the coax bundle to earth would tend to limit a strike's
/archives//html/Towertalk/2008-02/msg00373.html (7,381 bytes)

94. Re: [TowerTalk] Grounding Coax at Tower (score: 1)
Author: jimjarvis@optonline.net
Date: Wed, 27 Feb 2008 23:11:20 +0000 (GMT)
My comments were triggered by the chap who asked if he needed to run his coax to the base of the tower,  gnd it, and run it back up 10' for the run tothe house.   I was suggesting that he just ground
/archives//html/Towertalk/2008-02/msg00380.html (8,635 bytes)

95. Re: [TowerTalk] Q on guyed rotating towers (score: 1)
Author: jimjarvis@optonline.net
Date: Thu, 28 Feb 2008 17:56:17 +0000 (GMT)
Comments bottom-postedFrom: "Arthur Trampler" <atrampler@att.net>Subject: [TowerTalk] Q on guyed rotating towers<snip>From what I understand part of the strength of a guyed tower is that torsional mo
/archives//html/Towertalk/2008-02/msg00395.html (7,925 bytes)

96. Re: [TowerTalk] name that tower (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Mon, 03 Mar 2008 10:55:31 -0500
Derek, As one other fellow commented, this appears to be a Tristao design. It's an oldie, and definitely a lightweight crankup. And, from the pics, it appears to be in decent shape. Check the welds,
/archives//html/Towertalk/2008-03/msg00023.html (7,401 bytes)

97. Re: [TowerTalk] SteppIR vs. th7 stack (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Fri, 07 Mar 2008 12:34:47 -0500
Ken, You dont say what the heights are for the stack. My inclination would be to replace the upper th7 with the 4 el steppir, keeping the tic ring for the lower unit. You MIGHT find the th7 you're ta
/archives//html/Towertalk/2008-03/msg00092.html (7,388 bytes)

98. [TowerTalk] ICE (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Sat, 08 Mar 2008 07:00:27 -0500
One thing you have to do is give Mike credit. The eBay stunt surely got the word out, for free. Speculation is a wonderful thing. Interesting inputs from some pros. Let's leave it to the speculators,
/archives//html/Towertalk/2008-03/msg00115.html (6,825 bytes)

99. Re: [TowerTalk] Terman (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Sun, 09 Mar 2008 13:43:28 -0400
Whilst we celebrate the life of Frederick Terman, it might be well to note that another Terman, Dr. Lewis M, is the sitting president of the Institute of Electrical and Electronic Engineers. Througho
/archives//html/Towertalk/2008-03/msg00161.html (7,086 bytes)

100. Re: [TowerTalk] antenna height & trees & fairy tales (score: 1)
Author: jim Jarvis <jimjarvis@optonline.net>
Date: Mon, 10 Mar 2008 15:15:02 -0400
TT: This to some degree echoes previous comments, adding personal bias: 1) You can't control trees. Use 'em to hold up antennas, or ignore 'em, so long as they don't snag your beam. Tree absorption i
/archives//html/Towertalk/2008-03/msg00168.html (9,431 bytes)

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