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1. [Amps] Linearization problem (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 04 Dec 2014 14:05:18 +0000; Attention to all technically minded amp'ers! Maybe somebody has a good idea, that could contribute to some work I'm doing, which might end up being useful for the ham community. First I will explain; /archives//html/Amps/2014-12/msg00019.html (10,739 bytes)
2. Re: [Amps] Linearization problem (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Thu, 4 Dec 2014 08:50:16 -0800; Hi Manfred, Directional coupler. 73 & Good morning Marv WC6W http://qsl.net/wc6w/ Subject: [Amps] Linearization problem To: amps@contesting.com Date: Thursday, December 4, 2014, 6:05 AM Attention to; /archives//html/Amps/2014-12/msg00023.html (11,411 bytes)
3. Re: [Amps] Linearization problem (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Thu, 4 Dec 2014 18:16:41 +0100; I use a bird sampler http://www.birdrf.com/Products/Components/Variable-Signal-Samplers/4273-Seri es_15-35-MHz-Variable-RF-Signal-Samplers.aspx 73 Peter Hi Manfred, Directional coupler. 73 & Good mor; /archives//html/Amps/2014-12/msg00024.html (12,283 bytes)
4. Re: [Amps] Linearization problem (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 04 Dec 2014 18:12:39 +0000; Hi Marv, Directional coupler. I don't see how that could work. Indeed, if there was such a thing as a near-perfect directional coupler, in which the signal apearing on the side port depends _only_ on; /archives//html/Amps/2014-12/msg00026.html (8,550 bytes)
5. Re: [Amps] Linearization problem (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Thu, 04 Dec 2014 13:25:38 -0500; When this contraption is driven by a SSB signal, the bias control circuit will at all times apply such a bias voltage that the output amplitude remains very highly proportional to the input amplitud; /archives//html/Amps/2014-12/msg00027.html (8,964 bytes)
6. Re: [Amps] Linearization problem (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Thu, 4 Dec 2014 13:50:19 -0500; In the microwave world one would follow the coupler with a circulator and the energy reflected from the amplifier would dump into a dummy load. The coupler would then "see" a constant load and the co; /archives//html/Amps/2014-12/msg00029.html (8,870 bytes)
7. Re: [Amps] Linearization problem (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Thu, 4 Dec 2014 11:51:05 -0800; Instead of driving the amp with RF, I would suggest doing it digitally. Some years ago I toured the KFI transmitter in La Mirada, California and saw their Harris DX-50. It is a 50 kW AM transmitter t; /archives//html/Amps/2014-12/msg00030.html (7,837 bytes)
8. Re: [Amps] Linearization problem (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Thu, 04 Dec 2014 22:40:15 +0000; And a bonus question: Do you think that the phase distortion in such a class-A-AB-C-E amplifier will be bad enough to still cause poor IMD performance, even while the envelope linearity is excellent?; /archives//html/Amps/2014-12/msg00031.html (8,578 bytes)
9. Re: [Amps] Linearization problem (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 05 Dec 2014 14:18:19 +0000; Peter, I use a bird sampler http://www.birdrf.com/Products/Components/Variable-Signal-Samplers/4273-Seri es_15-35-MHz-Variable-RF-Signal-Samplers.aspx That one is non-directional. It's a plain simple; /archives//html/Amps/2014-12/msg00035.html (17,674 bytes)
10. Re: [Amps] Linearization problem (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Fri, 5 Dec 2014 16:22:31 +0100; Yes it is just a sampler and very useful to provide the feed signal for pre distortion with the Hermes board or ANAN transceiver. But you might prefer to build up a DC6NY board. http://www.hamsdr.com; /archives//html/Amps/2014-12/msg00036.html (17,107 bytes)
11. Re: [Amps] Linearization problem (score: 1): Author: "Doug Ronald" <doug@dougronald.com>; Date: Fri, 5 Dec 2014 09:58:39 -0800; Chuck Wenzel came up with a couple HF isolators that might be of use. Here are the links: http://www.wenzel.com/documents/circtran.htm This one is an RF Design award winner, and can achieve 60 dB of; /archives//html/Amps/2014-12/msg00037.html (17,373 bytes)
12. Re: [Amps] Linearization problem (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Fri, 5 Dec 2014 13:17:34 -0500; The typical phased vertical uses a 90 degree hybrid circuit which forces phase balance by dumping reflected RF into a dummy load. Carl KM1H In the microwave world one would follow the coupler with a; /archives//html/Amps/2014-12/msg00039.html (11,109 bytes)
13. Re: [Amps] Linearization problem (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Fri, 5 Dec 2014 10:30:12 -0800; I sent this to Manfred direct as an attachment but, that doesn't go with the reflector. I found the source "on line" so, here is a link for any who are interested. www.measurement.sk/2009/S1/Laurinav; /archives//html/Amps/2014-12/msg00040.html (9,841 bytes)

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