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1. [Amps] How intermod limits your PEP (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 16 May 2006 00:38:49 -0400; HOW INTERMOD LIMITS YOUR PEP. Some interesting notes on PEP and intermod. With 1000 watts PEP output and 3rd order IM products down -30 db from PEP (-24 db from from one tone of a two tone test ) the; /archives//html/Amps/2006-05/msg00107.html (9,556 bytes)
2. Re: [Amps] How intermod limits your PEP (score: 1): Author: Theo Bellamy <theo.bellamy@spirittelecom.com>; Date: Tue, 16 May 2006 08:43:02 -0400; Gary, Great piece ... thanks! I always wondered about the actual numbers. Talked to some goofball at a hamfest a while back who was telling me about his pair of 3-500Z with 5KV on them, and how they; /archives//html/Amps/2006-05/msg00110.html (10,866 bytes)
3. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Harold Mandel" <ka1xo@juno.com>; Date: Tue, 16 May 2006 12:57:08 -0400; What a fine presentation! Thanks for your easy-to-understand explanation of distortion-related inefficiency. I read of these "CB Shoot-Outs" where mobile operators run 15KW for 30 seconds or so, from; /archives//html/Amps/2006-05/msg00114.html (12,342 bytes)
4. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Tue, 16 May 2006 13:04:08 -0400; Hal, I wonder what all the molocules in their blood, and their genes have to say by setting directly under all that power? I have heard of several cases of cancer they think was caused by it, along w; /archives//html/Amps/2006-05/msg00115.html (14,970 bytes)
5. Re: [Amps] How intermod limits your PEP (score: 1): Author: jkearman@att.net (Jim Kearman); Date: Tue, 16 May 2006 17:08:27 +0000; Darwin was right! 73, Jim, KR1S http://kr1s.kearman.com/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-05/msg00116.html (7,619 bytes)
6. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 17 May 2006 01:14:37 +0100; I believe your conclusions are invalid. I don't think so - see below. You need to keep them in the same ratio. So if I am not mistaken, your example keeps to 1000 W PEP by 1) Reducing the useful sign; /archives//html/Amps/2006-05/msg00162.html (10,966 bytes)
7. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 16 May 2006 21:42:47 -0400; Hi David, Yes I am in error, thank you, but only on the examples where the PEP is greater than 1000 watts (1123 watt example) I believe. The signal should be 223 (not 233 as you noted). My attempt i; /archives//html/Amps/2006-05/msg00168.html (13,354 bytes)
8. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 17 May 2006 07:06:45 +0100; But as you say, as soon as you add any IMD, to a signal, whilst keeping the signal level constant at 1000 W PEP, the PEP power will exceed 1000 W due to the distortion. Are you talking about an AM si; /archives//html/Amps/2006-05/msg00175.html (10,079 bytes)
9. Re: [Amps] How intermod limits your PEP (score: 1): Author: dennis12amplify@aol.com; Date: Wed, 17 May 2006 09:15:27 -0400; Dave, Sounds like the only correct solution would be the point of convergence of two simultaneous equations... Regards, Dennis O. Motorola --Original Message-- From: Dr. David Kirkby <david.kirkby@on; /archives//html/Amps/2006-05/msg00181.html (10,648 bytes)
10. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Wed, 17 May 2006 15:20:54 +0100; Yes, you are right. There are two simultaneous equations which would need to be solved to do it properly. This is reminding me a bit of one of the 'RMS power' arguments on Amps. I eventually solved t; /archives//html/Amps/2006-05/msg00184.html (12,478 bytes)
11. Re: [Amps] How intermod limits your PEP (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Wed, 17 May 2006 12:46:33 -0400; I would like to see the solution to the math problem. However, I think that it is important for us to remember that Gary's point is valid. Many of those that look at their wattmeters and say they're; /archives//html/Amps/2006-05/msg00194.html (13,782 bytes)
12. Re: [Amps] How intermod limits your PEP (score: 1): Author: garyschafer@comcast.net; Date: Thu, 18 May 2006 00:46:23 +0000; Hi David, Thanks again for your comments. To accurately portray what I am saying I believe it would take a more complex math solution than what I am using. Maybe you or someone else can come up with; /archives//html/Amps/2006-05/msg00216.html (13,519 bytes)
13. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 18 May 2006 02:17:54 +0100; <snip> I don't guarantee this is right, but here is my attempt at the maths of this. It looks reasonable, but I have not checked it carefully. Assume the amp has at the output two wanted signal volta; /archives//html/Amps/2006-05/msg00218.html (15,690 bytes)
14. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Thu, 18 May 2006 02:29:10 +0100; Sorry, I made a few errors. Here are some corrections. That should have been Pi, not Pu. That should have been IMD = 10 log_base_10(V1^2 / V3^2) Oops, another mess up, that should have been 20 log_ba; /archives//html/Amps/2006-05/msg00219.html (10,286 bytes)
15. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 21 May 2006 21:45:36 -0400; -- Hi David, I see the problem. Your maths are calculating the 30 db down (or 20 db down in your first example) from one of the two tones power (A) rather than from PEP even though you say you are u; /archives//html/Amps/2006-05/msg00272.html (11,772 bytes)

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