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1. [Amps] IMD test question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 01 Aug 2012 13:15:04 -0700; Is there a way for a homebrewer to accurately measure IMD without expensive equipment? I'm thinking of doing two-tones at full power into a dummy load while listening on a second RX nearby. How does; /archives//html/Amps/2012-08/msg00012.html (7,366 bytes)
2. Re: [Amps] IMD test question (score: 1): Author: Gudguyham@aol.com; Date: Wed, 1 Aug 2012 16:19:51 -0400 (EDT); Bill, I'm SURE with today's multitude of hams with SDR radios, you should easily get dozens of hams to give you "on the air" results. It seems there is a lot of IMD cops out there. Pick one. In a mes; /archives//html/Amps/2012-08/msg00013.html (7,873 bytes)
3. Re: [Amps] IMD test question (score: 1): Author: Dan Mills <dmills@exponent.myzen.co.uk>; Date: Wed, 01 Aug 2012 21:32:42 +0100; Trouble is most of 'em don't know how to tell the difference between your IMD and their receiver overload! Rx connected to a PC with a decent sound card and some known attenuators is a reasonable sta; /archives//html/Amps/2012-08/msg00014.html (8,255 bytes)
4. Re: [Amps] IMD test question (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Wed, 01 Aug 2012 14:36:10 -0600; Bill, I have made amp IMD measurements with the circuit shown at http://www.w0qe.com/Technical_Topics/imd_testing_of_amplifiers.html which can measure any amp currently made. As I'm sure you are awar; /archives//html/Amps/2012-08/msg00015.html (8,835 bytes)
5. Re: [Amps] IMD test question (score: 1): Author: Gudguyham@aol.com; Date: Wed, 1 Aug 2012 16:39:39 -0400 (EDT); Trouble is most of 'em don't know how to tell the difference between your IMD and their receiver overload Oh, but they think they do _______________________________________________ Amps mailing list; /archives//html/Amps/2012-08/msg00017.html (7,063 bytes)
6. Re: [Amps] IMD test question (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 1 Aug 2012 16:54:47 -0400; There is lots of older lab grade HP test equipment on the surplus market. You dont need a SA that goes way into the GHz range to do an HF amp. I started with a 141T system in 97 and upgraded twice as; /archives//html/Amps/2012-08/msg00018.html (9,718 bytes)
7. Re: [Amps] IMD test question (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 01 Aug 2012 22:17:22 +0000; Adding to the IMD testing thread: When generating a dual tone signal in the computer, outputting it to one radio to generate the drive signal, and then using the same computer to do spectrum analisis; /archives//html/Amps/2012-08/msg00025.html (10,126 bytes)
8. Re: [Amps] IMD test question (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Wed, 01 Aug 2012 16:07:54 -0700; REPLY: Thanks, Larry. Great web site. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-08/msg00027.html (7,729 bytes)
9. Re: [Amps] IMD test question (score: 1): Author: "Mike" <noddy1211@sbcglobal.net>; Date: Wed, 1 Aug 2012 20:16:09 -0700; You would have to ask them if they had their Noise Blanker on first: -) Mie --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On Behalf Of Dan Mills Sent: We; /archives//html/Amps/2012-08/msg00029.html (9,514 bytes)
10. Re: [Amps] IMD test question (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Wed, 1 Aug 2012 20:51:14 -0700; There are a few hams on the West Coast who have marvelous antennas and "sufficient" amplifiers that have significant IMD. These hams happen to have the strongest signals and also have "followers" who; /archives//html/Amps/2012-08/msg00030.html (8,756 bytes)
11. Re: [Amps] IMD test question (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Wed, 1 Aug 2012 21:07:19 -0700; Larry.. Why not just use one transmitter with two audio tones 2 KHz apart? Can you expound on this a bit? 73 Jim W7RY Bill, I have made amp IMD measurements with the circuit shown at http://www.w0qe.; /archives//html/Amps/2012-08/msg00031.html (10,044 bytes)
12. Re: [Amps] IMD test question (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Wed, 01 Aug 2012 23:39:45 -0600; Jim, There are NO radios currently made (that I know of) that are capable with 2 audio tones input of having output IMD <-60dBc when driving even a dummy load. Even when driving the radio to 1/2 or 1; /archives//html/Amps/2012-08/msg00032.html (13,303 bytes)
13. Re: [Amps] IMD test question (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 2 Aug 2012 07:53:23 +0100; RX overload and purity of 2-tone sources are only important if the TX IMD is good (ie low). But there are no such problems when measuring BAD signals. These only require a dynamic range of 30-40dB, a; /archives//html/Amps/2012-08/msg00033.html (9,952 bytes)
14. Re: [Amps] IMD test question (score: 1): Author: Dan Mills <dmills@exponent.myzen.co.uk>; Date: Thu, 02 Aug 2012 23:20:22 +0100; Rx overload can be an issue that gets mistaken by those who do not understand the use of the attenuator for transmitter generated IMD if the receiver is seeing a massive signal from the subject trans; /archives//html/Amps/2012-08/msg00060.html (9,578 bytes)
15. Re: [Amps] IMD test question (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Fri, 3 Aug 2012 12:52:12 +0000; Usually the lemmings tell you you are full of it, because he "sounds fine to me here." When I was working on my FT1000MP with the key clicks I asked several guys on the air if they coould hear my cli; /archives//html/Amps/2012-08/msg00074.html (8,933 bytes)
16. Re: [Amps] IMD test question (score: 1): Author: Gudguyham@aol.com; Date: Fri, 3 Aug 2012 09:03:05 -0400 (EDT); Way back when I was a rock bound novice I would know when certain others had come on the air. I could hear their key clicks throughout the 80m novice band. Everybody knew when I was on the air too be; /archives//html/Amps/2012-08/msg00075.html (9,162 bytes)

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