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21. Re: Topband: "T"-Top Vertical Antennas (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 26 Jul 2009 11:54:30 -0400
America commemorative publication on the 1921 tests. In it Amy and Burghard describe the station antenna:..." Going back that far, there's bound to be some discrepancies about the 1BCG feed detail,
/archives//html/Topband/2009-07/msg00132.html (9,722 bytes)

22. Re: Topband: "T"-Top Vertical Antennas (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 26 Jul 2009 16:20:11 -0400
Frank, I had nearly forgotten about the February 1922 issue of QST. Better than a photo, it shows a detailed drawing of the "T" top-hat connection, including a bird's eye view of the elevated radial
/archives//html/Topband/2009-07/msg00136.html (9,222 bytes)

23. Re: Topband: Noise Cancellation Options? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 1 Oct 2009 14:27:58 -0400
Good point to keep in mind. The DX Engineering NCC-1 covers the full 360-degree phase range with flat gain characteristics. Although priced higher than the two units mentioned, quality of constructi
/archives//html/Topband/2009-10/msg00016.html (8,165 bytes)

24. Re: Topband: Gold Plated AC Outlets Accelerate W3UR's Quest for TBDXCC-300 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 2 Nov 2009 09:47:37 -0500
For the unknowing, it's easy for zealous audiophile types to get "caught up" in all the hype -- and the disease is pervasive throughout the high-end audio industry. Although I would never consider p
/archives//html/Topband/2009-11/msg00034.html (8,614 bytes)

25. Re: Topband: Hospital Grade Outlets and Surge Suppressors (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 2 Nov 2009 11:20:22 -0500
Jim, Even with primary suppression protection at the service entrance? The literature I'm seeing suggests the use of secondary suppression on branch circuits *only* after the inclusion of primary pr
/archives//html/Topband/2009-11/msg00038.html (8,473 bytes)

26. Re: Topband: Fw: Re: Coax Choke Balun (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 12 Nov 2009 13:35:45 -0500
Barry, to handle high power with a small coaxial cable, I typically use RG-303, and sometimes RG-400 (a variant of RG-142). These cables can be found on-line in various short lengths for winding cor
/archives//html/Topband/2009-11/msg00328.html (7,717 bytes)

27. Re: Topband: CCD antenna (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 8 Dec 2009 11:58:17 -0500
"A full wave antenna would usually have about 4K ohms at the feed point. Pretty hard to match a 50 ohm or even 300-600 ohm load to that. With the addition of the capacitors we can have a full wave a
/archives//html/Topband/2009-12/msg00092.html (8,187 bytes)

28. Re: Topband: Loud clicks (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 1 Jan 2010 12:12:37 -0500
Larry, Be careful when adjusting the RF delay on rigs like the K3. You may find that when delaying the RF envelope in the menu that additional key compensation is required to bring back proper keyed
/archives//html/Topband/2010-01/msg00018.html (10,864 bytes)

29. Re: Topband: Loud clicks (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 4 Jan 2010 18:28:36 -0500
Excellent advice, although anyone who can afford one of the popular late-generation SWR meters can certainly afford a used dual-trace oscilloscope. Quality scopes are plentiful on the used equipment
/archives//html/Topband/2010-01/msg00051.html (9,379 bytes)

30. Re: Topband: 160m Noise Floor (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 1 Sep 2010 18:16:04 -0400
One device at a time. I'm presently in the middle of an exercise to minimize my own noise floor. In the last couple months, I've identified nearly a dozen internal sources. Here's a partial list fro
/archives//html/Topband/2010-09/msg00004.html (11,206 bytes)

31. Re: Topband: The Slingshot Option (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 15 Oct 2010 10:27:12 -0400
As an alternative to a sligshot, I use a "junior bow," available at most of the large sports centers. These are quite a bit smaller than the larger adult bows, but they have more than enough power to
/archives//html/Topband/2010-10/msg00063.html (9,176 bytes)

32. Re: Topband: 160 metre vertical with 'top loading' (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 27 Apr 2011 10:16:53 -0400
A good starting point is here. Specifically, scroll down to: "Why the Net Current is not Constant Through a Loading Coil?" http://www.w5dxp.com/current.htm It's easy to fall back only to lumped anal
/archives//html/Topband/2011-04/msg00148.html (9,785 bytes)

33. Re: Topband: RFI (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 1 Nov 2011 10:22:26 -0400
Typical switch-mode noise. Over the years, I have had to identify several of these noise sources from within my own home as well as neighbors. Keep in mind this is a different type of noise to locali
/archives//html/Topband/2011-11/msg00005.html (9,931 bytes)

34. Re: Topband: Counterpoise very interresting (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 22 Nov 2011 14:16:18 -0500
As long as we're providing testimony against a defendant who is now a SK, I can counter those assertions by saying L.B. was extremely helpful to me as I began learning EZNEC. I had consulted with him
/archives//html/Topband/2011-11/msg00201.html (9,004 bytes)

35. Re: Topband: 1/2 wave spacing vs. 1/4 wave (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 23 Nov 2011 13:36:56 -0500
Wolf, the launch angle field strength immediately above the horizon is going to be determined primarily by the near and medium-distance ground conductivity. Notwithstanding gain, nulls, etc between
/archives//html/Topband/2011-11/msg00230.html (6,994 bytes)

36. Re: Topband: eznec question (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 7 Dec 2011 18:02:52 -0500
4Nec2 is free and is an excellent modeling software alternative to EZNEC. It's a helluva' gift to us from its author, Arie Voors. 4Nec2 will also open EZNEC files and supports the pro NEC/4 modeling
/archives//html/Topband/2011-12/msg00138.html (7,462 bytes)

37. Re: Topband: T-200 vs. T-300 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 15 Dec 2011 10:49:31 -0500
Another important rule when winding CM chokes: On common-mode currents (the bad current), an inductance equal to 2*L is added in series with each of the two conductors. On differential mode currents
/archives//html/Topband/2011-12/msg00367.html (7,918 bytes)

38. Re: Topband: Marconi Tee (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 11 Jan 2012 19:04:53 -0500
Cris, I think you will have better control over a dedicated vertical section. I recently assisted in the design of a Marconi "T" for N4NN. We used 600-ohm open feeder line for the vertical section in
/archives//html/Topband/2012-01/msg00163.html (9,403 bytes)

39. Re: Topband: A Ham for 75 Years (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 19 Jan 2012 10:56:50 -0500
Paul, Congrats on 75 years, and that's a great story to tell. For some, it's hard to believe that a single-step regen can perform well on an uncrowded band but apparently many ops used some form of a
/archives//html/Topband/2012-01/msg00188.html (11,670 bytes)

40. Re: Topband: Ticked over intentional interference on top band (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 22 Jan 2012 12:21:28 -0500
The dreaded "?" sent by the DX station is an invitation for mayhem. I agree with you. If the DX station is sending a partial call, followed by "?," all stations not remotely resembling the partial s
/archives//html/Topband/2012-01/msg00253.html (9,822 bytes)

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