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Total 288 documents matching your query.

21. Re: [TowerTalk] One DB (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 29 May 2007 21:01:07 -0400
Many years ago I was periphally involved (did a lot of the grunt work) with the first ham EME QSO by Sam Harris, W1FZJ/W1BU and W6AY at Eimac, on 1296. All the trials leading up to and including the
/archives//html/Towertalk/2007-05/msg00597.html (10,151 bytes)

22. [TowerTalk] WTB: Rohn 45G to 25G reducer section (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Wed, 30 May 2007 09:53:46 -0400
Looking for a good used section or NOS one that has been gathering dust. If a non Rohn substitute exists please let me know. Carl KM1H _______________________________________________ ________________
/archives//html/Towertalk/2007-05/msg00607.html (6,920 bytes)

23. Re: [TowerTalk] masts. (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 1 Jun 2007 12:13:18 -0400
I use 21' of 1020DOM 1/4" wall steel tube for 2 towers. However on another I have a 15' length of galvanized fence pipe. I believe it is called Schedule 40+ and it has supported a 3 el 20M monobander
/archives//html/Towertalk/2007-06/msg00011.html (10,153 bytes)

24. Re: [TowerTalk] masts. (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 1 Jun 2007 14:18:52 -0400
Calculated risk is what I called it! If only a single antenna of any significant wind load is going to be mounted just above the tower top plate then cast iron pipe is more than sufficient as there i
/archives//html/Towertalk/2007-06/msg00017.html (9,505 bytes)

25. Re: [TowerTalk] masts. (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 1 Jun 2007 16:55:31 -0400
There are several grades of fence posts; the cheap stuff is Schedule 15 and other choices go up to 83,000 psi yield strength. The 2" (1.9" OD) 40+ that I use has a yield of 50,000 psi and a bending m
/archives//html/Towertalk/2007-06/msg00023.html (13,477 bytes)

26. Re: [TowerTalk] masts. (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 1 Jun 2007 19:34:14 -0400
Which is not the same as fence industry size. They call it 2" & 2 1/2" for the Sch40. Trying to compare sizes across industries that do not have a common standard only results in headaches. Carl KM1
/archives//html/Towertalk/2007-06/msg00031.html (8,755 bytes)

27. Re: [TowerTalk] Yagiis (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 1 Jun 2007 22:31:58 -0400
Sounds like a Hi Gain, they always liked to add extra elements. I built PV 4el on 10/15/20 in 1983. They performed right by the published curves and I used a (compensated) severe taper on 20M. BTW, i
/archives//html/Towertalk/2007-06/msg00040.html (9,611 bytes)

28. Re: [TowerTalk] Yagiis (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 2 Jun 2007 14:24:18 -0400
Tom, I started with the taper schedule in Jims original paper and it was augmented by another that appeared in one of the contest journals, probably YCCC. Later on and after it was up for several yea
/archives//html/Towertalk/2007-06/msg00057.html (9,854 bytes)

29. Re: [TowerTalk] Yagis (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sat, 2 Jun 2007 22:20:52 -0400
One thing that I would consider with a 34' boom is interaction; it is possibly too close to resonant to be healthy IMO. Take a look at the 4 el Cushcraft on the same 34', its not a stellar performer.
/archives//html/Towertalk/2007-06/msg00060.html (9,727 bytes)

30. Re: [TowerTalk] masts. (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 4 Jun 2007 15:05:58 -0400
Simple, buy fence posts at a fence supply company, NOT an installer. Im in a semi rural area and there are several within 25 miles. Carl KM1H _______________________________________________ _________
/archives//html/Towertalk/2007-06/msg00069.html (9,743 bytes)

31. Re: [TowerTalk] elevated radials vertical (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 8 Jun 2007 13:31:38 -0400
Tom, have you used Elnec to model the folded unipole? Would you share some specifics? How about Professor John Mullaney's design program that is specific to that antenna; have you used it? Ive been t
/archives//html/Towertalk/2007-06/msg00141.html (8,319 bytes)

32. Re: [TowerTalk] elevated radials vertical (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 8 Jun 2007 20:23:15 -0400
Dont knock it if you havent tried it. At my prior QTH I used a 100' tower with a Christmas tree of W2PV monobanders as a shunt fed vertical on 160. I started with 4 radials 2" under the sod and coul
/archives//html/Towertalk/2007-06/msg00151.html (11,806 bytes)

33. Re: [TowerTalk] Rohn 45 (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Fri, 8 Jun 2007 20:25:42 -0400
Originals are Grade 5 Carl KM1H _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting
/archives//html/Towertalk/2007-06/msg00153.html (7,437 bytes)

34. Re: [TowerTalk] Where is the best place to buy aluminum tubing? (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Mon, 11 Jun 2007 14:46:14 -0400
I built a W2PV 4el 20 using 40' (two 20' lengths) of 3" irrigation tubing. Spliced in the center using about 18" of Schedule 40 aluminum pipe. Also used some 3" scrap from the supplier that I cut int
/archives//html/Towertalk/2007-06/msg00288.html (10,429 bytes)

35. [TowerTalk] Folded unipole modeling help (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 12 Jun 2007 12:00:32 -0400
I would appreciate help with modeling a folded unipole with a top hat. Thanks Carl KM1H _______________________________________________ _______________________________________________ TowerTalk maili
/archives//html/Towertalk/2007-06/msg00343.html (6,563 bytes)

36. Re: [TowerTalk] Balun question (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 14 Jun 2007 15:07:59 -0400
"Ordinary" coax could mean anything from hard line to poor shielding coverage CB or RatShack cable. My apologies to RatShack if they have improved their offerings in the 10 or so years since I last l
/archives//html/Towertalk/2007-06/msg00425.html (10,550 bytes)

37. Re: [TowerTalk] Ferrite Balun on a LPDA? (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 14 Jun 2007 15:24:02 -0400
Dan, thanks for that link. What are the specs of the Aztec sleeve balun? From the table it appears to use 73/77 mix ferrite which peaks at low HF. For 10-20M a 43 mix would improve the performance. A
/archives//html/Towertalk/2007-06/msg00426.html (11,026 bytes)

38. Re: [TowerTalk] Balun question shield leakage (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 14 Jun 2007 19:16:54 -0400
Playing in a lab somtimes has little bearing in a real world situation. With a reactive load as would exist with many commercial and home brew antennas leakage is not only possible but very likely.
/archives//html/Towertalk/2007-06/msg00440.html (16,457 bytes)

39. Re: [TowerTalk] Balun question (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 14 Jun 2007 19:26:13 -0400
Heat isnt the issue as I mentioned in another reply. Im sure they are. Ive been using ferrites and powdered iron in both lab and home enviroments for around 40 years from DC to 75 gHz and never stop
/archives//html/Towertalk/2007-06/msg00442.html (10,765 bytes)

40. Re: [TowerTalk] Balun question shield leakage (score: 1)
Author: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Thu, 14 Jun 2007 20:32:21 -0400
-- Original Message -- From: "Jim Lux" <jimlux@earthlink.net> To: "jeremy-ca" <km1h@jeremy.mv.com>; "Tom Rauch" <w8ji@contesting.com>; "Jim Brown" <jim@audiosystemsgroup.com>; "Tower Talk List" <towe
/archives//html/Towertalk/2007-06/msg00447.html (14,025 bytes)

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