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1. Re: [Amps] Bird Element Calibration? (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 26 Mar 2005 01:07:31 -0800; The other 1% of the time is when the FCC comes a knockin' and they bring their own digital PEP wattmeter. In actual practice, I know of two cases where the FCC measured well over 1500w-pep and did no; /archives//html/Amps/2005-03/msg00571.html (9,486 bytes)
2. Re: [Amps] Bird Element Calibration? (score: 1): Author: G3rzp@aol.com; Date: Sat, 26 Mar 2005 03:13:10 EST; I don't think there's a lot of disagreement between G8WRB and myself. We seem both to be very dubious about the accuracy of using an oscilloscope, and recognise the problems with calorimeters. Incide; /archives//html/Amps/2005-03/msg00568.html (8,302 bytes)
3. Re: [Amps] Bird Element Calibration? (score: 1): Author: Bob Nielsen <nielsen@oz.net>; Date: Fri, 25 Mar 2005 10:26:10 -0800; True, in fact we did use directional couplers as well as attenuators. I don't recall HP having coaxial couplers until later, but we used their waveguide couplers as well as coax units made by Narda a; /archives//html/Amps/2005-03/msg00556.html (10,407 bytes)
4. Re: [Amps] Bird Element Calibration? (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 25 Mar 2005 09:28:04 -0800; Hewlett Packard also made directional couplers. If the loss factor in the forward pickoff arm of the coupler was known, power measurements could extend considerably upward. Richard L. Measures, AG6K,; /archives//html/Amps/2005-03/msg00555.html (9,630 bytes)
5. Re: [Amps] Bird Element Calibration? (score: 1): Author: Bob Nielsen <nielsen@oz.net>; Date: Fri, 25 Mar 2005 08:07:24 -0800; The Hewlett-Packard Calorimeter I used at Hughes Aircraft in the early 1960s was much faster than that. It didn't take much longer to make a measurement than using a bolometer-type meter--not instant; /archives//html/Amps/2005-03/msg00552.html (8,996 bytes)
6. Re: [Amps] Bird Element Calibration? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Fri, 25 Mar 2005 10:16:50 -0500; I have an old HP calorimeter buried here somewhere. I guess I should dig it out. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte; /archives//html/Amps/2005-03/msg00550.html (13,767 bytes)
7. Re: [Amps] Bird Element Calibration? (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Fri, 25 Mar 2005 10:48:53 +0000; Peter, you are agreeing with *all* the comments I have put here. So there seems to be little (if any) disagreement between us. 1) In response to Gary Smith I said " I suspect Bird use Calorimeters fo; /archives//html/Amps/2005-03/msg00549.html (12,384 bytes)
8. Re: [Amps] Bird Element Calibration? (score: 1): Author: G3rzp@aol.com; Date: Thu, 24 Mar 2005 13:54:46 EST; Life would be so much easier if my customers would understood that sometimes a dB really doesn't matter. If they understood that most of the time, a dB doesn't really matter, it would help me!! 73 Pe; /archives//html/Amps/2005-03/msg00545.html (7,845 bytes)
9. Re: [Amps] Bird Element Calibration? (score: 1): Author: "Martin Sole" <msole@loxinfo.co.th>; Date: Thu, 24 Mar 2005 21:21:05 +0700; A very good point which raises the question: In terms of overall communcations effectiveness this means what? --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.co; /archives//html/Amps/2005-03/msg00543.html (9,286 bytes)
10. Re: [Amps] Bird Element Calibration? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Thu, 24 Mar 2005 14:06:30 +0000; Life would be so much easier if my customers would understood that sometimes a dB really doesn't matter. Steve _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2005-03/msg00542.html (8,383 bytes)
11. Re: [Amps] Bird Element Calibration? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Thu, 24 Mar 2005 08:58:27 -0500; A 5% error in measuring voltage means a 10% error when calculating power. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2005-03/msg00541.html (9,109 bytes)
12. Re: [Amps] Bird Element Calibration? (score: 1): Author: G3rzp@aol.com; Date: Thu, 24 Mar 2005 05:50:02 EST; Another problem with calorimetry is the time it takes, which with a sweep tube amplifier would be prohibitive - even pulsed! I haven't seen a 'scope guaranteed better than 5%, even the new super doop; /archives//html/Amps/2005-03/msg00540.html (7,810 bytes)
13. Re: [Amps] Bird Element Calibration? (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Wed, 23 Mar 2005 23:07:46 +0000; Peter, I might have an answer to that one. In the book "Principles of Microwave Measurements" by GH Bryant, IEE (1998). It mentions several variants of the Caliormeter for high power measurements, bu; /archives//html/Amps/2005-03/msg00538.html (11,855 bytes)
14. Re: [Amps] Bird Element Calibration? (score: 1): Author: "John Vickers" <wa4tt@nlamerica.com>; Date: Wed, 23 Mar 2005 13:26:59 -0500; -- Original Message -- > In 1965 I was checked and they used plate voltage & current. At that time the limit was 1kw input. But they also used a 43 to check output and the drive from my old HT 37. Al; /archives//html/Amps/2005-03/msg00530.html (8,725 bytes)
15. Re: [Amps] Bird Element Calibration? (score: 1): Author: G3rzp@aol.com; Date: Wed, 23 Mar 2005 12:38:45 EST; The FCC does not measure power at amateur radio stations with a Bird 43. As a matter of interest, what do they use? Or do they not actually bother measuring the power of amateur stations unless there; /archives//html/Amps/2005-03/msg00526.html (8,265 bytes)
16. Re: [Amps] Bird Element Calibration? (score: 1): Author: <paul.whatton@ntlworld.com>; Date: Wed, 23 Mar 2005 15:10:33 +0000; It's a few years since my station was officially visited as a result of a neighbour's TVI complaint, but here in the UK the inspecting officer did indeed arrive clutching a Bird 43. -- Email sent fro; /archives//html/Amps/2005-03/msg00523.html (8,842 bytes)
17. Re: [Amps] Bird Element Calibration? (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 23 Mar 2005 03:33:49 -0800; The FCC does not measure power at amateur radio stations with a Bird 43. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@; /archives//html/Amps/2005-03/msg00517.html (13,727 bytes)
18. Re: [Amps] Bird Element Calibration? (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Tue, 22 Mar 2005 14:22:41 -0500; Only by the unknowing. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00494.html (9,688 bytes)
19. Re: [Amps] Bird Element Calibration? (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Tue, 22 Mar 2005 10:37:46 -0800; Accurate or not, the Bird 43 is the accepted standard. Although there are devices available with more accuracy when that power out readings are taken with something other than a Bird, the question mi; /archives//html/Amps/2005-03/msg00492.html (12,850 bytes)
20. Re: [Amps] Bird Element Calibration? (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Tue, 22 Mar 2005 10:40:30 -0800; I did ere on that statement. Offering free mea culpa's and anjeo tequila to those who wish to stop by. 73, Gary... wa6fgi How are Bird wattmeters calibrated at the factory? - I used to work in a cali; /archives//html/Amps/2005-03/msg00491.html (10,459 bytes)

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