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1. [Amps] Russian power L-coupler (score: 1): Author: Angel Vilaseca <avilaseca@bluewin.ch>; Date: Fri, 17 Nov 2006 13:37:45 +0100; Hi, On Ebay, I saw some russian L-couplers for sale. They are made of two coils, both wound on a virtual sphere. One of the coils is slightly smaller and placed within the larger one. The inner coil; /archives//html/Amps/2006-11/msg00214.html (6,606 bytes)
2. Re: [Amps] Russian power L-coupler (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 17 Nov 2006 08:10:26 -0500; They are sometimes called variometers. They have terrible Q at minimum inductance, especially at higher frequencies. Of all the common methods, this is the least efficient way to vary inductance ove; /archives//html/Amps/2006-11/msg00215.html (6,955 bytes)
3. Re: [Amps] Russian power L-coupler (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 17 Nov 2006 16:25:57 +0100 (CET); They have terrible Q at minimum inductance, especially at higher frequencies. Of all the common methods, this is the least efficient way to vary inductance over a wide range.< Strictly, a variometer; /archives//html/Amps/2006-11/msg00216.html (8,058 bytes)
4. Re: [Amps] Russian power L-coupler (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Fri, 17 Nov 2006 17:20:45 +0100; My first TRX in 1963 was a Wireless Set No.19 MkIII equipped with the 807 in the final. That radio also used a variometer as an ATU, it was a very quick and reliable means of coupling random wires or; /archives//html/Amps/2006-11/msg00217.html (9,096 bytes)
5. Re: [Amps] Russian power L-coupler (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 17 Nov 2006 17:37:20 +0100 (CET); the final. That radio also used a variometer as an ATU, it was a very quick and reliable means of coupling random wires or verticals to the rig from 2-8MHz< I had forgotten the 19 set - mainly, I sup; /archives//html/Amps/2006-11/msg00218.html (7,529 bytes)
6. Re: [Amps] Russian power L-coupler (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 17 Nov 2006 12:21:35 -0500; I wonder how bad the varicouplers really are. The they often don't have a rolling or rubbing contact like roller inductors because a piece of very flexible wire can be used. Also, you can go from max; /archives//html/Amps/2006-11/msg00219.html (8,890 bytes)
7. Re: [Amps] Russian power L-coupler (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 17 Nov 2006 13:10:07 -0500; The area that primarily causes Q reduction in a roller inductor at lower frequencies is the shunt capacitance from the inductor to the frame and the countering flux generated by end plates if metall; /archives//html/Amps/2006-11/msg00222.html (9,348 bytes)
8. Re: [Amps] Russian power L-coupler (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 17 Nov 2006 15:32:28 -0500; Sorry I meant 180 degrees. The point is if it is used in an application where a high Q is not needed there would be no problem because the circulating currents would not be high. Often they were used; /archives//html/Amps/2006-11/msg00224.html (10,883 bytes)
9. Re: [Amps] Russian power L-coupler (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 17 Nov 2006 16:10:51 -0500; I don't think everyone has a grasp of how poor that design is for wide range inductances. Let's assume it takes 20 feet of #12 wire to have enough inductance to cover 160 meters. On ten meters the s; /archives//html/Amps/2006-11/msg00225.html (10,537 bytes)
10. Re: [Amps] Russian power L-coupler (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Fri, 17 Nov 2006 15:25:21 -0600; Yeah, why use a ball of wire for an inductor when you can bend up some serious water pipe to do the same thing? I don't think everyone has a grasp of how poor that design is for wide range inductance; /archives//html/Amps/2006-11/msg00226.html (10,982 bytes)
11. Re: [Amps] Russian power L-coupler (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 17 Nov 2006 17:08:39 -0500; You are assuming the Varicoupler is supposed to cover say .5uH to 80uH. Which is not its usual application. It is often use to fill in the gaps between taps on larger coils. Also, as I said in a L-Ne; /archives//html/Amps/2006-11/msg00227.html (8,719 bytes)

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