- 1. [Amps] TMC amp toroid tank (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 26 Mar 2007 18:20:12 -0400
- I have an old TMC (LPA-1k) amplifier that I am getting going. It has a toroid tank coil for all bands 1.6 MHz to 18 MHz. It has a pair of 3-500Z in it with 3000 volts at 700 mills. On 160 the efficie
- /archives//html/Amps/2007-03/msg00348.html (7,238 bytes)
- 2. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Mon, 26 Mar 2007 20:20:53 -0400
- I'd never use a torrid in a wide frequency range tank circuit. If the toroid behaved perfectly as in theory it would not work at all over wide frequency ranges. This is because in a normal pick up a
- /archives//html/Amps/2007-03/msg00354.html (7,688 bytes)
- 3. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "k7fm" <k7fm@teleport.com>
- Date: Mon, 26 Mar 2007 17:54:36 -0700
- Years ago I tore apart a small RCA AVT-112 (I am guessing at the numbers). It was an aircraft transmitter for WW-II Piper Cubs types using a 6V6 final on 3 MHz. It had a wonderful inductor tuned by a
- /archives//html/Amps/2007-03/msg00356.html (7,528 bytes)
- 4. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 26 Mar 2007 21:27:43 -0400
- Hi Tom, I could see really killing it if the turns were shorted but this amp uses taps on the toroid coil it does not short the turns. The core is about 2 1/2 inches in diameter and about 3 inches i
- /archives//html/Amps/2007-03/msg00357.html (9,285 bytes)
- 5. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Mon, 26 Mar 2007 21:53:55 -0400
- I don't understand that. Surely at least one end is tied to a tap point! Let's assume the thing has 20 turns and the 20 MHz tap point is at 4 turns. If the 4 turn tap was selected withouit shorting
- /archives//html/Amps/2007-03/msg00358.html (7,212 bytes)
- 6. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "Gary Schafer" <garyschafer@comcast.net>
- Date: Mon, 26 Mar 2007 22:22:51 -0400
- Yes you are right Tom. It gets taped from the antenna side as a normal tank coil would. No progressive shorting. So on 20 meters most of the coil is shorted. It seems to work very well on 160 and 80
- /archives//html/Amps/2007-03/msg00359.html (8,532 bytes)
- 7. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Tue, 27 Mar 2007 06:16:31 -0400
- It doesn't surprise me it falls apart on the upper end with a tapped toroid. The closed core is almost covered with a big shorted winding on the upper end. Unloaded Q has to be terrible. I've seen m
- /archives//html/Amps/2007-03/msg00361.html (9,646 bytes)
- 8. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: Vic K2VCO <vic@rakefet.com>
- Date: Tue, 27 Mar 2007 08:30:35 -0700
- This made me think that possibly you could make a very compact tank assembly by simply stacking six individual toroids with maybe 1/4" between them. Since so little flux escapes from the cores, they
- /archives//html/Amps/2007-03/msg00362.html (8,101 bytes)
- 9. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Tue, 27 Mar 2007 12:28:27 -0400
- They have more flux leakage than people think as well as the electric field problems Vic, but it still might be OK. You'd have to short all or most of the unused toroids. 73 tom ____________________
- /archives//html/Amps/2007-03/msg00364.html (8,174 bytes)
- 10. Re: [Amps] TMC amp toroid tank (score: 1)
- Author: Steve Thompson <g8gsq@eltac.co.uk>
- Date: Tue, 27 Mar 2007 17:46:17 +0100
- Does double pole switching work - or is it too hairy at the high impedance end? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com
- /archives//html/Amps/2007-03/msg00366.html (8,171 bytes)
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