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Total 13 documents matching your query.

1. Topband: Norton preamp (score: 1)
Author: "Steve Flood" <flood@ixi.net>
Date: Sat, 20 Jan 2007 08:18:04 -0700
Has anyone tried one of these preamp designs? I cannot make sense of the use of the extremely hi-mu FT-50-75 cores in this design. http://www.kongsfjord.no/dl/Amplifiers/Ultralinear%202N5109%20And%20
/archives//html/Topband/2007-01/msg00332.html (6,571 bytes)

2. Re: Topband: Norton preamp (score: 1)
Author: "Rick Karlquist" <richard@karlquist.com>
Date: Sat, 20 Jan 2007 09:38:34 -0800 (PST)
The transformers are standard broadband receiving type transformers, which typically use hi-mu cores. Get a copy of "Transmission Line Transformers" to read about this. Additional comments: I have be
/archives//html/Topband/2007-01/msg00335.html (10,316 bytes)

3. Re: Topband: Norton preamp (score: 1)
Author: "amdx" <amdx@knology.net>
Date: Sat, 20 Jan 2007 14:30:35 -0600
Original http://www.kongsfjord.no/dl/Amplifiers/Ultralinear%202N5109%20And%202N3053%20Amplifiers.pdf Hi Steve, I built a couple of the push-pull amps in 1996 using the pcb design as in the article yo
/archives//html/Topband/2007-01/msg00340.html (8,300 bytes)

4. Re: Topband: Norton preamp (score: 1)
Author: "Steve Flood" <flood@ixi.net>
Date: Sat, 20 Jan 2007 13:50:53 -0700
might need a very high-mu core. Thanks for all the feedback everyone. I guess what I have trouble understanding with the transformers is that if we are talking about a 50-ohm system, it has been my
/archives//html/Topband/2007-01/msg00341.html (7,893 bytes)

5. Re: Topband: Norton preamp (score: 1)
Author: "Ian Keyser" <ian.keyser@btopenworld.com>
Date: Sat, 20 Jan 2007 22:21:34 -0000
This idea was first outlined, as far as I know, back in about 1986 by Peter Chadwick of 'racal' (I think)..... he called it 'noiseless feedback'. I used it in several of my designs for my company Kan
/archives//html/Topband/2007-01/msg00342.html (7,397 bytes)

6. Re: Topband: Norton preamp (score: 1)
Author: "Ford Peterson" <ford@cmgate.com>
Date: Sat, 20 Jan 2007 22:19:53 -0600
...snip... I built a couple of the push-pull amps in 1996 using the pcb design as in the article you cited. I used one in Dallas's phasing unit and If I recall correctly, I setup the other for a loop
/archives//html/Topband/2007-01/msg00343.html (9,944 bytes)

7. Re: Topband: Norton preamp (score: 1)
Author: "Tom Rauch" <w8ji@contesting.com>
Date: Sun, 21 Jan 2007 06:50:55 -0500
Hi Ford, IP measurement points are theoretical points where the input signal would generate an undesired product that is equal to the good signal. That can, of course, really never happen in real li
/archives//html/Topband/2007-01/msg00345.html (10,616 bytes)

8. Re: Topband: Norton preamp (score: 1)
Author: Michael Rauh <mikerauh@yahoo.com>
Date: Sun, 21 Jan 2007 05:09:24 -0800 (PST)
Ford, The intercept points are fictitious. They are calculated by taking a measurement in the linear region of the device under test. The measurement for third-order intercept (TOI) is made with two
/archives//html/Topband/2007-01/msg00347.html (8,309 bytes)

9. Re: Topband: Norton preamp (score: 1)
Author: shristov@ptt.yu
Date: Sun, 21 Jan 2007 14:47:28 CET
Intercept Point values represent no real physical power. They are rather arbitrary numbers calculated from distortion measurement results. It is, therefore, perfectly possible to have such a large n
/archives//html/Topband/2007-01/msg00348.html (7,827 bytes)

10. Re: Topband: Norton preamp (score: 1)
Author: <andy.ikin@btopenworld.com>
Date: Sun, 21 Jan 2007 19:13:16 -0000
Steve, I have made hundreds of balanced Norton amplifiers, ones where the windings are consolidated onto just two fair-rite 28430000302 twin hole cores. Also I have experimented with the 4 transforme
/archives//html/Topband/2007-01/msg00355.html (9,305 bytes)

11. Re: Topband: Norton preamp (score: 1)
Author: "Ford Peterson" <ford@cmgate.com>
Date: Mon, 22 Jan 2007 10:49:05 -0600
...snip... I find the very high TOI of 40-50dBm useful in my application but the rest just makes for meaningless conversation. If you are in a noise limited urban environment even a 20dBm TOI might b
/archives//html/Topband/2007-01/msg00365.html (10,085 bytes)

12. Re: Topband: Norton preamp (score: 1)
Author: Terry Conboy <n6ry@arrl.net>
Date: Mon, 22 Jan 2007 15:24:57 -0800
Ford, This may seem like an intuitive way to estimate TOI, but it most likely isn't related to the TOI at all. For example, an amplifier that will produce no more than 0 dBm output no matter how hard
/archives//html/Topband/2007-01/msg00368.html (10,115 bytes)

13. Re: Topband: Norton preamp (score: 1)
Author: kurt-erich.finger@arcor.de
Date: Wed, 14 Feb 2007 22:05:06 +0100 (CET)
While Dallas Lankford uses FT50-75 toroids in his design of a Norton amplifier, I found an article on www.qrp.pops.net/preamp.htm where a Norton amplifierwith binocular cores BN43-2402 is described (
/archives//html/Topband/2007-02/msg00116.html (7,129 bytes)

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