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Total 36 documents matching your query.

1. [TenTec] "A low vswr will kill you ! " (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Tue, 23 Jan 2001 14:42:09 -0500; I agree completely with Dr. Johnson and Mr. Ellingston's comments regarding baluns. Since no one presently builds a well engineered link coupled antenna tuner for with a true balanced transformer out; /archives//html/TenTec/2001-01/msg00495.html (10,409 bytes)
2. [TenTec] "A low vswr will kill you ! " (score: 1): Author: csturner@falcon.csc.calpoly.edu (Clark Savage Turner); Date: Tue, 23 Jan 2001 12:28:45 -0800 (PST); You know, I have kept my Johnson matchbox in my closet for the time I have some space for a longer wire and some open wire feeders. I also have a Harvey-Wells Z match up there on the shelf, and, as I; /archives//html/TenTec/2001-01/msg00499.html (8,657 bytes)
3. [TenTec] "A low vswr will kill you ! " (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Tue, 23 Jan 2001 15:47:24 -0500; The Harvey Wells Z match was a commercial offering of a unique circuit with true transformer- balanced output that appeared in May, 1955 QST. It also appears on pages 353 and 354 of the 1958 ARRL Han; /archives//html/TenTec/2001-01/msg00500.html (9,406 bytes)
4. [TenTec] "A low vswr will kill you ! " (score: 1): Author: wa5jci@flash.net (Spencer Petri); Date: Tue, 23 Jan 2001 15:03:32 -0600; Greetings, I use a Johnson matchbox with a centerfed 80 meter doublet. I made the feed line out of the copper antenna wire at Radio Shack and ceramic spreaders bought from Fair Radio years ago. The s; /archives//html/TenTec/2001-01/msg00501.html (11,012 bytes)
5. [TenTec] "A low vswr will kill you ! " (score: 1): Author: rohre@arlut.utexas.edu (Stuart Rohre); Date: Tue, 23 Jan 2001 15:24:36 -0600; Corn, I echo the sentiments about the Johnson Matchboxes, both models. The so called "low power" one was of course in the context of the 50's where 100 per cent AM modulation sent the power up on pea; /archives//html/TenTec/2001-01/msg00504.html (8,975 bytes)
6. [TenTec] "A low vswr will kill you ! " (score: 1): Author: csturner@falcon.csc.calpoly.edu (Clark Savage Turner); Date: Tue, 23 Jan 2001 13:24:49 -0800 (PST); The Z match claims it will handle 500 watts AM in the manual. I put an SB-200 through mine (at over 600 watts PEP) and had no qualms at all. Clark WA3JPG -- FAQ on WWW: http://www.contesting.com/FAQ/; /archives//html/TenTec/2001-01/msg00506.html (9,134 bytes)
7. [TenTec] "A low vswr will kill you ! " (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Tue, 23 Jan 2001 16:32:32 -0500; Don't forget, 500 watts of plate modulated am is equal to 2000 watts of pep ssb as far as peak voltages developed. - Corn- k4own -- FAQ on WWW: http://www.contesting.com/FAQ/tentec Submissions: tente; /archives//html/TenTec/2001-01/msg00512.html (9,394 bytes)
8. [TenTec] "A low vswr will kill you ! " (score: 1): Author: gctotten@juno.com (Gerald C Totten); Date: Tue, 23 Jan 2001 17:43:17 -0500; Heath made air core baluns years ago. They were designed for the output of a DX-100 if I remember correctly and could be wired for 1:1 or 4:1 / 75 ohm or 300 ohm. Has anyone tried using one recently?; /archives//html/TenTec/2001-01/msg00515.html (9,741 bytes)
9. [TenTec] "A low vswr will kill you ! " (score: 1): Author: kh7m@hsa-kauai.net (Jim Reid); Date: Tue, 23 Jan 2001 13:02:34 -1000; On link coupled, balanced tuners: Perhaps the "best" circuit is presented by L B Cebik in his discussion of link coupled antenna tuners at: http://www.cebik.com/link0.html This tutorial material is i; /archives//html/TenTec/2001-01/msg00516.html (11,846 bytes)
10. [TenTec] "A low vswr will kill you ! " (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 23 Jan 2001 17:50:41 -0600; The air core baluns are not as effective at forcing balance as the toroidal baluns, nor as tolerant for frequency or impedance ranges. They may not overheat the core but they may not accomplish the b; /archives//html/TenTec/2001-01/msg00518.html (9,849 bytes)
11. [TenTec] "A low vswr will kill you ! " (score: 1): Author: w5yr@att.net (George, W5YR); Date: Tue, 23 Jan 2001 17:56:00 -0600; Agreed, Jerry. But, the real question is "where on Earth would you find one?" <:} 72/73, George W5YR - the Yellow Rose of Texas NETXQRP 6 Fairview, TX 30 mi NE Dallas in Collin county QRP-L 1373 Amat; /archives//html/TenTec/2001-01/msg00519.html (10,776 bytes)
12. [TenTec] "A low vswr will kill you ! " (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 23 Jan 2001 18:18:21 -0600; My tuner uses the parallel secondary connection that Cebek reports for some antennas and feed line lengths and the series connection for others. With 1/4" edge wound strap in the coil, its easy to co; /archives//html/TenTec/2001-01/msg00520.html (10,938 bytes)
13. [TenTec] "A low vswr will kill you ! " (score: 1): Author: n4lq@iglou.com (Steve Ellington); Date: Tue, 23 Jan 2001 21:15:56 -0500; I've often wondered why everyone seems to put up 132 or 135ft dipoles fed with tuned feeders. Since the whole system is tuned, why bother making the flat-top a certain length? Using a simple 'basic'; /archives//html/TenTec/2001-01/msg00524.html (10,401 bytes)
14. [TenTec] "A low vswr will kill you ! " (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 23 Jan 2001 22:30:39 -0600; I guess we think about resonance in the antenna being better for radiation, but there have been "magic" easily tuned lengths (and antenna and feed) in antenna articles and handbooks ever since the us; /archives//html/TenTec/2001-01/msg00528.html (11,282 bytes)
15. [TenTec] "A low vswr will kill you ! " (score: 1): Author: w5yr@att.net (George, W5YR); Date: Tue, 23 Jan 2001 22:38:22 -0600; Seems like I recall that a lot of the "magic length" business originated with efforts to minimize the effects of line pickup and attendant unbalance or common-mode current in the case of coax. 72/73,; /archives//html/TenTec/2001-01/msg00529.html (12,242 bytes)
16. [TenTec] "A low vswr will kill you ! " (score: 1): Author: kh7m@hsa-kauai.net (Jim Reid); Date: Tue, 23 Jan 2001 19:53:10 -1000; In H. Hertz's paper of 1889*, he did not require that the radiating element be "resonant". In fact, that idea did not then exist! *1. Hertz H., "On the relation between light and electricity" Gesamme; /archives//html/TenTec/2001-01/msg00530.html (10,692 bytes)
17. [TenTec] "A low vswr will kill you ! " (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed, 24 Jan 2001 10:30:27 -0600; Nope, just chosen to make tuning easier. Predates coax by decades. Line pickup is mostly a function of spacing and antenna balance in open wire feeders. Feeder balance is upset by the feeder not bein; /archives//html/TenTec/2001-01/msg00533.html (10,834 bytes)
18. [TenTec] "A low vswr will kill you ! " (score: 1): Author: geraldj@ames.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed, 24 Jan 2001 10:30:24 -0600; Hertz didn't REQUIRE a resonant radiating element but that resonant radiating element was his only frequency determining element in his experiments. Radiating elements don't need to be resonant to fu; /archives//html/TenTec/2001-01/msg00534.html (10,491 bytes)
19. [TenTec] "A low vswr will kill you ! " (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Wed, 24 Jan 2001 14:34:54 -0500; Dr. Johnson: I find your comments very interesting. However your second paragraph seems to conflict with the principles of conjugate impedance matching as described by Mr. Walter Maxwell in the QST a; /archives//html/TenTec/2001-01/msg00542.html (10,373 bytes)
20. [TenTec] "A low vswr will kill you ! " (score: 1): Author: w5yr@att.net (George, W5YR); Date: Wed, 24 Jan 2001 13:43:52 -0600; Actually, Jim, a "dipole" antenna can be as short as about 0.1 normal size and still be over 90% efficient in radiating the power it is fed. (Those are very approximate values.) The idea that an ante; /archives//html/TenTec/2001-01/msg00543.html (14,582 bytes)

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