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Total 8 documents matching your query.

1. [AMPS] Inductors (score: 1): Author: w6frmarv@dslextreme.com (Marv Gonsior); Date: Mon, 17 Dec 2001 16:43:11 -0800; Season's Greetings To All: For those interested in variable inductors, there was an oldie but I think worth reviewing, that was a rotating shorted turn inside the winding. Old handbooks showed the co; /archives//html/Amps/2001-12/msg00311.html (7,410 bytes)
2. [AMPS] Inductors (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 18 Dec 2001 07:56:35 -0000; I think tuning range is a bit limited. Does a variometer do any better andwork at high power? Steve -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative r; /archives//html/Amps/2001-12/msg00318.html (7,723 bytes)
3. [AMPS] Inductors (score: 1): Author: ToddRoberts2001@aol.com (ToddRoberts2001@aol.com); Date: Tue, 18 Dec 2001 04:17:10 EST; I think the most efficient variable inductor I have seen is one based on the "screwdriver" antenna. A coil is placed inside a copper tube of slightly larger diameter. At one end of the copper tube is; /archives//html/Amps/2001-12/msg00319.html (7,789 bytes)
4. [AMPS] Inductors (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Tue, 18 Dec 2001 05:11:26 -0500; I have a question, unless there is a "slit" cut down one side of this copper tube wouldn't it (the copper tube) also act as a shorted turn? Mark WB8JKR _______________________________________________; /archives//html/Amps/2001-12/msg00320.html (8,880 bytes)
5. [AMPS] Inductors (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 18 Dec 2001 08:25:29 +0000; It works fine in 50MHz amplifiers, with no noticeable heating in the shorted turn if it is made from continuous copper (eg a slice from a seamless tube, or a disk with a hole punched out). The shorte; /archives//html/Amps/2001-12/msg00321.html (8,782 bytes)
6. [AMPS] Inductors (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 18 Dec 2001 04:55:38 -0800; Various means are available to vary the inductance over a limited range - without resorting to a large rotary inductor. How about this for a suggestion. Amplifier is built with small value variable C; /archives//html/Amps/2001-12/msg00325.html (8,678 bytes)
7. [AMPS] Inductors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 18 Dec 2001 11:38:44 -0500; Absolutely! If you don't slot the length of the metal tube near the active area of the coil there is a "shorted turn effect" that reduces Q and increases circulating currents. There is also a Q redu; /archives//html/Amps/2001-12/msg00329.html (7,783 bytes)
8. [AMPS] Inductors (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 19 Dec 2001 08:17:17 -0000; Variometers were used a lot in 500kHz marine tx's. The big problem with them is at minimum inductance, where Lt = L1 - L2 - 2M, but R is the same. The Q gets a bit abysmal if you want a wide range. A; /archives//html/Amps/2001-12/msg00336.html (7,676 bytes)

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