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1. Topband: CQ160 Rule Changes in 2003 - Multi-Op Time Limit - Summary and Recommendation (score: 1): Author: jkaufmann@alum.mit.edu (John Kaufmann); Date: Wed, 15 Jan 2003 21:06:52 -0500; At KC1XX we certainly won't be doing over 36 hours...very likely less. For one thing we don't have the manpower to keep going beyond that, not to mention the fact that none of our crew would want to; /archives//html/Topband/2003-01/msg00084.html (7,710 bytes)
2. Topband: Skew paths (score: 1): Author: jkaufmann@alum.mit.edu (John Kaufmann); Date: Sun, 19 Jan 2003 15:00:26 -0500; This is almost stating the obvious but for paths between locations that are almost antipodal, the distinction between short path, long path, and skew path is almost meaningless. Of course, this doesn; /archives//html/Topband/2003-01/msg00151.html (7,081 bytes)
3. RE: Topband: Vertical in the woods (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sun, 12 Oct 2003 22:12:43 -0400; The new KC1XX 160m antenna system is installed in dense woods. To get an idea of the environment, take a look at some of the photos on the KC1XX Web site: http://www.kc1xx.com/antennas/160_array.pdf.; /archives//html/Topband/2003-10/msg00060.html (7,817 bytes)
4. RE: Topband: Group delay distortion in receiver filters (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sun, 16 Nov 2003 20:47:52 -0500; wonder to The effects of phase distortion are completely analogous in both electrical and optical signals. I have worked professionally in both areas (I currently work in the area of ultra-high speed; /archives//html/Topband/2003-11/msg00117.html (8,077 bytes)
5. RE: Topband: DX window (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sun, 28 Dec 2003 20:49:20 -0500; Bill is 100% correct. I can assure you cheaters eventually get "discovered", certainly by their fellow hams if not by the contest committees, no matter how clever they think they are. The top-notch c; /archives//html/Topband/2003-12/msg00250.html (8,314 bytes)
6. Topband: Notes on early JA to East Coast QSO's (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 20 Jan 2004 22:36:50 -0500; Since the band has opened this week to JA from New England for the first time this season, it brings to mind some of the early attempts to work Japan from New England on 160. Here's my attempt to rec; /archives//html/Topband/2004-01/msg00179.html (10,572 bytes)
7. Topband: XU7ACY (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sat, 7 Feb 2004 10:43:14 -0500; XU7ACY was heard quite clearly (but not worked) on 1823 this morning from 1145Z to my sunrise at 1155Z. He was peaking west on the 270-degree Beverage. It's always interesting how signals from Asia/P; /archives//html/Topband/2004-02/msg00124.html (6,620 bytes)
8. RE: Topband: BDR redux (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 10 Feb 2004 21:10:00 -0500; All the discussion on AGC got me interested in finding out why the IC-781 has the most transparent AGC action I've found among all the radios I've used. By transparent, I mean it doesn't get in the w; /archives//html/Topband/2004-02/msg00152.html (10,566 bytes)
9. RE: Topband: 3B9C to KA6W (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sat, 27 Mar 2004 21:45:23 -0500; This does seem to be true, too, from New England. Western Australia (VK6) is almost antipodal to my QTH in eastern MA. VK6HD and VK6VZ are sometimes remarkably strong on short path around our local s; /archives//html/Topband/2004-03/msg00298.html (8,159 bytes)
10. RE: Topband: MF Anti-Podal Propagation Enhancement (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 30 Mar 2004 07:28:49 -0500; from I mentioned a few days ago that VK6 is nearly (but not exactly) antipodal to my QTH. Most of the time there is definite directionality to the signals, but it is unpredictable. On short path, it; /archives//html/Topband/2004-03/msg00330.html (7,912 bytes)
11. Topband: K2GNC is alive and well (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Fri, 25 Jun 2004 20:35:41 -0400; Many of you will recall my post a few months ago about the first contacts from the US East Coast to JA on 160. I mentioned there that Bill, K2GNC, on Long Island was the first W1/W2/W3 station to do; /archives//html/Topband/2004-06/msg00086.html (8,779 bytes)
12. RE: Topband: Receivers (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sat, 13 Nov 2004 13:50:53 -0500; The TS-940S has a major weakness, namely poor phase noise performance. It is worse than the TS-930S and TS-830S in this regard. Early model 940's are terrible. The transmit signal contains lots of tr; /archives//html/Topband/2004-11/msg00139.html (9,466 bytes)
13. RE: Topband: 200pF HV-capacitor for shunt feeding (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 14 Dec 2004 20:47:42 -0500; RG-213 generally makes a poor choice for a capacitor. The issue is RF loss, which appears as a resistance in series with the desired capacitance (or inductance). The longer the coax, the larger the; /archives//html/Topband/2004-12/msg00198.html (8,673 bytes)
14. RE: Topband: Re: Coax capacitor losses (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Fri, 17 Dec 2004 22:09:39 -0500; When I refer to "loss resistance" in my earlier post, I am really referring to an equivalent loss resistance that accounts for power dissipation from all physical mechanisms. It models as a resistanc; /archives//html/Topband/2004-12/msg00246.html (8,787 bytes)
15. RE: Topband: [Fwd: Your "echo " on 160] (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Mon, 14 Feb 2005 19:17:22 -0500; There are reports of LDE's on 160 (and 80) by several JA's. See http://park1.wakwak.com/~ja7ao/lde/ldese.htm. 73, John W1FV _______________________________________________ Topband mailing list Topban; /archives//html/Topband/2005-02/msg00165.html (7,627 bytes)
16. Re: Topband: JA sp/lp from east coast (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 08 Mar 2005 19:03:49 -0500; The only station that I'm aware of who has worked JA long path from the USA is K1ZM. During the mid-1990's, I heard LP JA's on several occasions during December and January just after local sunset fr; /archives//html/Topband/2005-03/msg00096.html (7,930 bytes)
17. Re: Topband: Arching Prevention (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Wed, 09 Nov 2005 20:14:20 -0500; I wrote this and made a typo here. It should read "...across the two N.C. contacts for 80m..." and not "N.O." Sorry for the confusion. The other point I made to made to Bob (AA6VB) off-list was that; /archives//html/Topband/2005-11/msg00079.html (7,992 bytes)
18. Re: Topband: Arching Prevention (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Wed, 09 Nov 2005 21:45:31 -0500; I made a typo that was confusing and erroneous. I fixed that. "unused" 80m relay contacts (which are at best a few millimeters apart) during 160m operation with the loading coil. It's no wonder there; /archives//html/Topband/2005-11/msg00081.html (8,671 bytes)
19. Re: Topband: 1820.4 Help needed MA and NH (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Sat, 10 Dec 2005 15:32:14 -0500; County, or what I've gathered a couple more reports from southern NH: WA1Z (Windham, NH) reports a peak to the NW. W1ZC (Mason, NH) reports a peak to the NE. The carrier was S9+15 dB at 2 pm local ti; /archives//html/Topband/2005-12/msg00129.html (8,548 bytes)
20. Re: Topband: What's best (your opinion) (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Thu, 15 Feb 2007 20:38:29 -0500; For a stock, unmodified radio, the Ten-Tec Orion with its narrow roofing filters is probably best IMHO. Many people have issues with the Orion's user interface (not very intuitive), so it's not the; /archives//html/Topband/2007-02/msg00132.html (8,181 bytes)

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