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Total 23 documents matching your query.

1. [Amps] Pre-Distortion Linearizer (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 3 May 2013 08:18:02 -0400; Not exactly Motorola transistor related but the subject reminded me of this: AC2IQ has developed an interesting pre-distortion "linearizer." http://www.qrz.com/db/AC2IQ Linearizers have been used in; /archives//html/Amps/2013-05/msg00036.html (9,497 bytes)
2. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: jeff millar <wa1hco@wa1hco.net>; Date: Fri, 03 May 2013 19:10:06 -0400; Hi Paul.. Check out US Patent 4588958 by Allen Katz K2UYH. It's a common way to linearize solid state PAs for the cellular market back in the day. The basic idea is to emulate the compression curve o; /archives//html/Amps/2013-05/msg00050.html (11,935 bytes)
3. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 3 May 2013 20:34:40 -0400; Check out US Patent 4588958 by Allen Katz K2UYH. It's a common way to linearize solid state PAs for the cellular market back in the day. Great info, Jeff. Looks like K2UYH has multiple, related linea; /archives//html/Amps/2013-05/msg00053.html (8,756 bytes)
4. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Robert Carroll" <w2wg@comcast.net>; Date: Fri, 3 May 2013 22:07:25 -0400; As a former Bell Labs design supervisor in the cellular wideband linear amplifier design area, I can say that predistortion schemes as well as feedforward linearization were being studied intensely a; /archives//html/Amps/2013-05/msg00054.html (9,753 bytes)
5. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Leigh Turner" <invertech@frontierisp.net.au>; Date: Sat, 4 May 2013 12:09:00 +0930; That's right Bob, complex indeed. Such linearization and intermodulation distortion correction techniques are not the panacea they might first seem; their practical implementation in ham-radio gear i; /archives//html/Amps/2013-05/msg00055.html (9,581 bytes)
6. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Fri, 03 May 2013 21:11:41 -0600; As long as the transceiver manufacturers give us transceivers with poor IMD, it does little good to get the IMD on the amplifier good, unless you home brew your own transceiver. Tom W0IVJ On 5/3/2013; /archives//html/Amps/2013-05/msg00056.html (11,178 bytes)
7. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 04 May 2013 02:05:02 -0700; Tom W0IVJ On 5/3/2013 8:39 PM, Leigh Turner wrote: That's right Bob, complex indeed. Such linearization and intermodulation distortion correction techniques are not the panacea they might first seem;; /archives//html/Amps/2013-05/msg00059.html (13,216 bytes)
8. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sat, 4 May 2013 06:42:02 +0000; The goals are different for Cell phone systems and single channel radio communication. In amateur radio the objective is to reduce adjacent channel interference. While in Cell Phone systems the purpo; /archives//html/Amps/2013-05/msg00061.html (14,798 bytes)
9. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Ian White" <gm3sek@ifwtech.co.uk>; Date: Sat, 4 May 2013 10:24:39 +0100; IMD, home Transceiver and amplifier manufacturers will continue to give us poor IMD for exactly as long as the major equipment reviewers (ARRL, RSGB and DARC... but mainly ARRL) continue to remain si; /archives//html/Amps/2013-05/msg00062.html (8,368 bytes)
10. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 4 May 2013 09:27:01 -0400; This may change as more users become accustomed to using their SDR displays for diagnostic purposes, especially when the SDR in use is a direct DDC type. When using a device like the SDR-IQ and QS1R,; /archives//html/Amps/2013-05/msg00065.html (11,948 bytes)
11. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Sat, 4 May 2013 06:37:35 -0700 (GMT-07:00); "Transceiver and amplifier manufacturers will continue to give us poor IMD for exactly as long as the major equipment reviewers (ARRL, RSGB and DARC... but mainly ARRL) continue to remain silent." Bu; /archives//html/Amps/2013-05/msg00067.html (9,204 bytes)
12. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: Keith Morehouse <w9rm@calmesapartners.com>; Date: Sat, 4 May 2013 09:05:19 -0500; THIS (below) is why many insightful hams have PA's capable of "illegal power output". They run them backed off 3 or 4 dB and have nice clean signals while those around them with the latest "1.5KW" un; /archives//html/Amps/2013-05/msg00071.html (9,919 bytes)
13. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 04 May 2013 10:36:27 -0400; The problem is that manufacturers are not going to be able to produce a "low end transceiver" - at least at the low end price point - that has all the features demanded by the marketplace. The techno; /archives//html/Amps/2013-05/msg00072.html (8,958 bytes)
14. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 04 May 2013 12:11:09 -0700; It seems to me that many of the newer transceivers have receiver sections that are getting pretty good. If their less than 20 over and you hear splatter you can be pretty sure it's them and not your; /archives//html/Amps/2013-05/msg00074.html (8,850 bytes)
15. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Joe Giacobello, K2XX" <k2xx@swva.net>; Date: Sat, 04 May 2013 13:33:00 -0400; IIRC, back in the old days of SSB, it was recommended to run one's exciter at maximum output and swamp the excess drive with a resistive pad. The reason was that the exciters obtained their maximum c; /archives//html/Amps/2013-05/msg00077.html (10,615 bytes)
16. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sat, 04 May 2013 14:34:32 -0700; The problem is that manufacturers are not going to be able to produce a "low end transceiver" - at least at the low end price point - that has all the features demanded by the marketplace. The techno; /archives//html/Amps/2013-05/msg00080.html (12,112 bytes)
17. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Ian White" <gm3sek@ifwtech.co.uk>; Date: Sun, 5 May 2013 11:47:59 +0100; You have a point, Joe; both transmitters and receivers fall into different classes of performance depending on the price range. But there is still no valid reason for any transceiver to perform signi; /archives//html/Amps/2013-05/msg00095.html (11,852 bytes)
18. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sun, 05 May 2013 13:19:46 +0200; Manufacturers have gone mad about IMD in receivers but can you use it? e.g. a +40dBm TOIP with a 10dB NF. In SSB, that's an rx noise floor of -130dBm and an SFDR of 113dB. To use that, you need phase; /archives//html/Amps/2013-05/msg00097.html (9,385 bytes)
19. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 05 May 2013 19:48:40 -0700; You have a point, Joe; both transmitters and receivers fall into different classes of performance depending on the price range. But there is still no valid reason for any transceiver to perform signi; /archives//html/Amps/2013-05/msg00104.html (14,471 bytes)
20. Re: [Amps] Pre-Distortion Linearizer (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 05 May 2013 20:53:06 -0700; You have a point, Joe; both transmitters and receivers fall into different classes of performance depending on the price range. But there is still no valid reason for any transceiver to perform signi; /archives//html/Amps/2013-05/msg00106.html (13,334 bytes)

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