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Total 16 documents matching your query.

1. [AMPS] receivers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Jan 2001 17:44:28 -0500; Here are some specs: But back to Tom's point. I went through a number of swept test data and was surprised to find that my generalization was not true in all cases. Here is the 5-kHz data for the rig; /archives//html/Amps/2001-01/msg00369.html (8,534 bytes)
2. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 07:51:37 -0000; Tom, how do you define Blocking Dynamic Range? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com P; /archives//html/Amps/2001-01/msg00374.html (7,707 bytes)
3. [AMPS] receivers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 16 Jan 2001 10:30:20 -0500; Blocking dynamic range is the ratio of the weakest signal that can be heard to a signal off-frequency that causes a detectable difference in noise or level of the desired signal. 73, Tom W8JI w8ji@c; /archives//html/Amps/2001-01/msg00385.html (8,003 bytes)
4. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 16 Jan 2001 15:50:32 -0000; So it's a sort of mixture of phase noise performance and gain compression. Needs a good signal generator to measure - or do it at 21.4MHz minus a few kHz with a 21.4MHz filter cleaning up the sig gen; /archives//html/Amps/2001-01/msg00390.html (8,516 bytes)
5. [AMPS] receivers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 16 Jan 2001 13:57:33 -0500; I don't know. When I measure stuff on transmitters and receivers here there is a big difference between different pieces of gear. I'm amazed at the difference. 73, Tom W8JI w8ji@contesting.com -- FA; /archives//html/Amps/2001-01/msg00395.html (8,353 bytes)
6. [AMPS] receivers (score: 1): Author: sm5ki@algonet.se (Hans Goldschmidt); Date: Tue, 16 Jan 2001 21:57:35 +0000; 1-01-15 22.44, skrev Tom Rauch på w8ji@contesting.com följande: " What is wrong with present days receivers" from 1956 QST stated you have to have your selectivity as close to the antenna; /archives//html/Amps/2001-01/msg00399.html (10,695 bytes)
7. [AMPS] receivers (score: 1): Author: sm5ki@algonet.se (Hans Goldschmidt); Date: Tue, 16 Jan 2001 21:57:35 +0000; 1-01-16 15.50, skrev Peter Chadwick på Peter_Chadwick@mitel.com följande: In the ARRL curves very often there is a spike abt 15 khz away from the carrier from the switched supply or maybe; /archives//html/Amps/2001-01/msg00400.html (9,503 bytes)
8. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 17 Jan 2001 07:58:47 -0000; I did a lot of work on IMD in crystal filters back in the mid 1970's. The ferrite transformer business I found interesting, since I was never able to find a filter where the ferrite transformer was t; /archives//html/Amps/2001-01/msg00404.html (10,038 bytes)
9. [AMPS] receivers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Jan 2001 12:21:22 -0500; Peter replied: It's amazing what a single incorrect article can start. Because of stuff in ham books, people think: 1.) Folded unipoles improve antenna ground system system efficiency. 2.) Ferrites; /archives//html/Amps/2001-01/msg00427.html (9,335 bytes)
10. [AMPS] receivers (score: 1): Author: 2@vc.net (measures); Date: Wed, 17 Jan 2001 16:57:36 -0800; "incorrect article" = examines self-declared expert's decrees. depends on Webers per cubic meter. If the output waveform is notably distorted, you have core saturation. ? see Figure 24 on my Web sit; /archives//html/Amps/2001-01/msg00437.html (9,179 bytes)
11. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 08:33:07 -0000; That generally (but not always) goes with heat in the core, too. Of course, tiny cores can saturate at powers so low you don't notice the heat. I worked on a project once with transformers that didn'; /archives//html/Amps/2001-01/msg00452.html (8,930 bytes)
12. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 08:47:52 -0000; I know some antenna professionals who think that, too. I think it's because there's two definitions in the text books for radiation resistance - one that's right all the time, and one that's right un; /archives//html/Amps/2001-01/msg00454.html (8,524 bytes)
13. [AMPS] receivers (score: 1): Author: drkirkby@ntlworld.com (David Kirkby); Date: Thu, 18 Jan 2001 09:32:50 +0000; It would seem that paralleling high voltage transformers of slightly different voltages does quite a good job of that !! -- Dr. David Kirkby Ph.D, email: drkirkby@ntlwold.com (formally davek@medphys.; /archives//html/Amps/2001-01/msg00455.html (8,093 bytes)
14. [AMPS] receivers (score: 1): Author: sm5ki@algonet.se (Hans Goldschmidt); Date: Thu, 18 Jan 2001 12:39:39 +0000; 1-01-18 08.33, skrev Peter Chadwick på Peter_Chadwick@mitel.com följande: As far as I remember there were several articles regarding this subject in some old German magazines by Martin. On; /archives//html/Amps/2001-01/msg00456.html (10,533 bytes)
15. [AMPS] receivers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 18 Jan 2001 12:07:22 -0000; There was an article by Ulrich Rohde in Ham radio about time, in which there was front end described using an XF9B. I wrote to Ulrich, pointing out that there was a problem with the filter: he wrote; /archives//html/Amps/2001-01/msg00457.html (8,355 bytes)
16. [AMPS] receivers (score: 1): Author: ac6tk@cybertime.net (J. Bradshaw); Date: Thu, 18 Jan 2001 12:33:56 -0800; there's two definitions in the text books for radiation resistance - one that's right all the time, and one that's right under certain conditions. The other complication is that folding the antenna; /archives//html/Amps/2001-01/msg00473.html (8,593 bytes)

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