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Total 37 documents matching your query.

21. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Wed, 29 Mar 2000 16:17:49 -0500; I don't mean to keep beating a dead horse, but I really get a good laugh when some of you microprocessor types tell me what narrow bandwidth my old Johnson Matchbox has! I have used it to feed 500 wa; /archives//html/TenTec/2000-03/msg00442.html (10,150 bytes)
22. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: cherry@neta.com (Jim FitzSimons); Date: Wed, 29 Mar 2000 14:57:08 -0700; Sherrill, I use a high impedance balun made with low loss teflon insulated wire on a T-200-2 toroid. It is broad band and it is outside. It is also a impedance transformer from 600 Ohm for a ladder l; /archives//html/TenTec/2000-03/msg00445.html (9,841 bytes)
23. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: reid.w.simmons@intel.com (Simmons, Reid W); Date: Wed, 29 Mar 2000 14:21:39 -0800; I think by what was meant is that the Matchbox has a lower impedance matching range when compared to the "infamous 'T' match" circuit. I know the 'T' matches I have owned or built were capable of han; /archives//html/TenTec/2000-03/msg00447.html (11,398 bytes)
24. [TenTec] Re: Ten Tec Antenna Tuners (score: 1): Author: cherry@neta.com (Jim FitzSimons); Date: Wed, 29 Mar 2000 17:32:36 -0700; Jan, in the book Transmission Line Transformers by Jerry Sekick, W2FMI second editon published by ARRL there is the best solution to connecting 450 ohm balanced line to 50 Ohm coax. On page 9-33 sect; /archives//html/TenTec/2000-03/msg00450.html (12,721 bytes)
25. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: kh7m@hsa-kauai.net (Jim Reid); Date: Wed, 29 Mar 2000 14:57:29 -1000; Sherill wrote, in part: Hi, My guess is they mean "instantaneous bandwidth"; or how many kHz you can QSY the rig and still have a good match to the feedline/antenna system before having to tweak the; /archives//html/TenTec/2000-03/msg00451.html (10,868 bytes)
26. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: Walter Dufrain" <walter@inlink.com (Walter Dufrain); Date: Wed, 29 Mar 2000 20:20:50 -0600; A Balanced Balanced L-Network makes a nice tuner for my Ten Tec rigs. If you would like to view the info, see URL http://www.vcnet.com/measures Also, the roller inductors are not necessary, you can j; /archives//html/TenTec/2000-03/msg00456.html (9,769 bytes)
27. [TenTec] Re: Ten Tec Antenna Tuners (score: 1): Author: RMcGraw@blomand.net (Robert & Linda McGraw); Date: Wed, 29 Mar 2000 21:09:00 -0600; Jan; First I do suggest that you connect the 450 line direct to the balanced terminals of the tuner. Take advantgage of the internal balun. As to RF in the shack, if the antenna is reasonably well ba; /archives//html/TenTec/2000-03/msg00457.html (13,322 bytes)
28. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Thu, 30 Mar 2000 10:46:51 -0500; Carl: Very good question about the feasibility of bringing balanced line into the shack. I am aware of two methods to do this. The first and easiest method is to use two pieces of equal length coaxia; /archives//html/TenTec/2000-03/msg00461.html (12,284 bytes)
29. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Thu, 30 Mar 2000 11:58:56 -0500; Dear Mr. Reid: Very many thank's for your great information regarding the Johnson Matchbox. Now I can probably use it on the WARC bands as well! On another matter, for those who notice what a very la; /archives//html/TenTec/2000-03/msg00462.html (11,481 bytes)
30. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: cherry@neta.com (Jim FitzSimons); Date: Thu, 30 Mar 2000 12:32:29 -0700; Sherrill, my balun is made with a T-200-2 powered iron toroid. A T-200-2 toroid is not small and it is not ferrite. The band width on my balun is not as wide as a ferrite balun but it will never satu; /archives//html/TenTec/2000-03/msg00466.html (13,517 bytes)
31. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: RMcGraw@blomand.net (Robert & Linda McGraw); Date: Thu, 30 Mar 2000 17:39:16 -0600; While using two pieces of coax in a physical configuration to simulate a balanced line may appear to be satisfactory, I point out that the loss in coax operating with a high SWR i.e. 10:1 is much muc; /archives//html/TenTec/2000-03/msg00473.html (16,068 bytes)
32. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: vbbond@ix.netcom.com (Vince & Betty); Date: Thu, 30 Mar 2000 19:59:04 -0800; To: <tentec@contesting.com> wire line is to place the balun on the input side of the T type tuner. Why this simple solution never Sir: You are correct, there is, as far as I can survey, only one US; /archives//html/TenTec/2000-03/msg00475.html (11,221 bytes)
33. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: dan.newby@ipix.com (Dan Newby); Date: Fri, 31 Mar 2000 07:59:14 -0500; Bob, I believe everyone is talking about using two pieces of coax to simulate a balanced at a length just long enough to get thru the wall of the house. So by your numbers if this took 10ft of coax t; /archives//html/TenTec/2000-03/msg00477.html (16,204 bytes)
34. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: SEWATKINS@dgs.state.va.us (Sherrill WATKINS); Date: Fri, 31 Mar 2000 09:42:30 -0500; Robert: You are correct when you say that coax operated at high vswr has very high loss when compared to open wire line. That is the very reason that I prefer open wire line. However, I may stand cor; /archives//html/TenTec/2000-03/msg00478.html (16,037 bytes)
35. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: patrickth@mindspring.com (Patrick A. Thompson Sr.); Date: Fri, 31 Mar 2000 00:27:27 -0500; I suspect the line loss when using two pieces of coax to simulate a balenced line is closer to the loss from using shielded twinlead as opposed to unshielded twinlead or ladderline. In this case the; /archives//html/TenTec/2000-03/msg00481.html (10,925 bytes)
36. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 31 Mar 2000 15:43:59 -0500; What benefit is derived from twisting the feedline? Is it physical or electrical? From the 1920s and '30s issues of QST, I often find descriptions for adding "transposition blocks" on the feedline e; /archives//html/TenTec/2000-03/msg00485.html (9,093 bytes)
37. [TenTec] Re: Ten Tec antenna tuners (score: 1): Author: rohre@arlut.utexas.edu (Stuart Rohre); Date: Fri, 31 Mar 2000 17:22:57 -0500; Pat, The losses are due to the DIELECTRIC of the coax, thus, would most certainly be a factor, however, as has been pointed out for only a foot or so to get thru a wall or window, this would wash out; /archives//html/TenTec/2000-03/msg00486.html (9,934 bytes)

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