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21. [TowerTalk] RE: Bobtail Curtain (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Tue, 8 Feb 2005 13:31:19 -0500
Daniel, I used a bobtail curtain on 40m for many years. It was the only antenna I have had on 40 on which I could work dx during the summer months through the S9+ static. One thing I did differently
/archives//html/Towertalk/2005-02/msg00198.html (10,456 bytes)

22. RE: [TowerTalk] RE: Bobtail Curtain (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Tue, 8 Feb 2005 20:10:11 -0500
Tom, Yes, I modeled the coax as a grounded piece of wire connected to one side of the source. My goal was to establish boundary conditions that discouraged feedline currents to a large degree using a
/archives//html/Towertalk/2005-02/msg00216.html (10,111 bytes)

23. RE: [TowerTalk] RE: Bobtail Curtain (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Wed, 9 Feb 2005 10:50:33 -0500
Tom, Yes, sometimes the cure is worse than the disease, especially if you are not adept with the cure. In those days, Chuck and I conversed about antennas almost daily on 2m during commute time as we
/archives//html/Towertalk/2005-02/msg00236.html (10,385 bytes)

24. Re: [TowerTalk] amplifiers for phased arrays (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Fri, 4 Mar 2005 23:19:24 -0500
Jim, I have been dreaming about the same kind of active TX/RX array you are talking about. Since I have been considering doing it for 160m QRP, I have envisioned each "final amp" to be broadband opam
/archives//html/Towertalk/2005-03/msg00123.html (31,747 bytes)

25. Re: [TowerTalk] Active phased arrays. (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Sun, 6 Mar 2005 14:47:23 -0500
I have been thinking about this TX phased array idea for a couple of years now, but as I said before, I have been working like a crazy man trying to get a software business going so I have been putti
/archives//html/Towertalk/2005-03/msg00147.html (14,202 bytes)

26. Re: [TowerTalk] Active phased arrays. (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Sun, 6 Mar 2005 23:32:11 -0500
Tom wrote.... All you'd have is a fancy MFJ-1025, and all the same limitations that apply to a MFJ-1025 would apply to the DSP system. You can't separate them and process them separately with a phasi
/archives//html/Towertalk/2005-03/msg00159.html (12,381 bytes)

27. Re: [TowerTalk] Active phased arrays. (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Mon, 7 Mar 2005 11:15:26 -0500
Tom wrote. That's exactly what the 1025 does. I think what you are missing is the fact the signal can't be separated from the noise and phased differently. The combining of multiple phased antennas p
/archives//html/Towertalk/2005-03/msg00165.html (12,205 bytes)

28. Re: [TowerTalk] Active phased arrays. (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Mon, 7 Mar 2005 15:57:32 -0500
Tom wrote. You must be talking about an entire receiver chain including detectors, rather than the system Jim described. In that case you could sample broadband noise (as long as it wasn't "hiss") an
/archives//html/Towertalk/2005-03/msg00168.html (8,932 bytes)

29. Re: [TowerTalk] Moxon rectangles (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Sat, 26 Mar 2005 17:18:30 -0500
Clive, Sorry for the belated response, and sorry to the list if this was already suggested. I have had good luck tuning different Moxon antennas according to the following method. Model the antenna t
/archives//html/Towertalk/2005-03/msg00852.html (10,682 bytes)

30. [TowerTalk] Lightning attraction to "attic dipoles" (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Fri, 1 Apr 2005 10:51:54 -0500
Jim, It seems that both everyone and noone is an expert on lightning. So there is no reason to think that I have any more insight into your question than you would have. However, there is something I
/archives//html/Towertalk/2005-04/msg00015.html (9,846 bytes)

31. [TowerTalk] FD Antenna Discussison - Just for Fun (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Mon, 25 Apr 2005 15:08:15 -0400
Lee, I'm not sure if you are looking for other ideas or an opinion on your proposal. As to the latter, I think a vertical is not a good performer for FD, since it's a low angle radiator and it doesn'
/archives//html/Towertalk/2005-04/msg00695.html (9,981 bytes)

32. [TowerTalk] RE :Mosley TA34XL (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Sat, 30 Apr 2005 14:53:31 -0400
Jim, The Mosley faq at the link you provided sheds no light on why they recommend no balun. It's as unscientific as their inability to explain that advice over the phone. That business about gain and
/archives//html/Towertalk/2005-04/msg00802.html (8,484 bytes)

33. Re: [TowerTalk] Short Ground Rods?? (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Thu, 19 May 2005 12:34:42 -0400
Warren, The PolyPhaser literature says that adjacent lightning ground rods need be no closer than the sum of their depths. So two 8 foot rods should be 16 feet apart. Closer spacing than that does no
/archives//html/Towertalk/2005-05/msg00547.html (9,614 bytes)

34. Re: [TowerTalk] Radial Length (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Mon, 20 Jun 2005 22:18:21 -0400
Don, An HF whip on a motor home is similar to one on any vehicle. Since the vehicle capacitively couples to the ground, it is similar to a ground mounted vertical with radials lying on or very near t
/archives//html/Towertalk/2005-06/msg00481.html (10,487 bytes)

35. Re: [TowerTalk] dipole question (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Fri, 22 Jul 2005 18:57:03 -0400
Al, The answer to your question of how much feedline radiation to expect is much less mysterious than people think. The most important point is that rf current on the outside of the coax shield is co
/archives//html/Towertalk/2005-07/msg00582.html (12,301 bytes)

36. Re: [TowerTalk] CFA - Don't go there! (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Fri, 22 Jul 2005 23:59:46 -0400
Oh gosh, Al, don't mention the CFA. It might produce more list traffic than the dropping of the code requirement. This is the antenna industry's answer to Cold Fusion and the Pogue Carburetor that ru
/archives//html/Towertalk/2005-07/msg00600.html (9,912 bytes)

37. [TowerTalk] No Lids, no kids.... (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Sun, 24 Jul 2005 23:05:05 -0400
I had the perfect formula for making him mad. I used to go back to him with my eeyellowee 15 year old voice running carrier control AM from my DX-60. You want to hear mad? Dudley - WA1X Message: 6 Da
/archives//html/Towertalk/2005-07/msg00712.html (7,640 bytes)

38. Re: [TowerTalk] TowerTalk Digest, Vol 33, Issue 7 (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Thu, 1 Sep 2005 21:24:59 -0400
Vojtech wrote and Jim Lux responded...... Message: 8 Date: Thu, 01 Sep 2005 15:52:31 -0700 From: Jim Lux <jimlux@earthlink.net> Subject: Re: [TowerTalk] 4SQ for 80M To: Vojtech Ritzko <om8aw@yahoo.co
/archives//html/Towertalk/2005-09/msg00045.html (9,801 bytes)

39. Re: [TowerTalk] TowerTalk Digest, Vol 33, Issue 32 (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Fri, 9 Sep 2005 14:59:02 -0400
Ian wrote....... Message: 1 Date: Fri, 9 Sep 2005 15:35:22 +0100 From: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk> Subject: [TowerTalk] Reduced size four-squares? To: towertalk@contesting.com Message-I
/archives//html/Towertalk/2005-09/msg00242.html (11,695 bytes)

40. [TowerTalk] 4 -Square and Radials (score: 1)
Author: "Dudley Chapman" <chief@thechief.com>
Date: Fri, 9 Sep 2005 17:47:38 -0400
Jim Lux clarified..... Jim, Thanks for the clarification. It looks like I have had an oversimplified view of current in the ground near a vertical. Dudley - WA1X _____________________________________
/archives//html/Towertalk/2005-09/msg00248.html (7,624 bytes)


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