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41. [AMPS] Re: (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 26 Jul 1999 12:06:04 -0400; .....or a good peak reading wattmeter. The rise and fall times of voice waveforms are so slow, it is quite easy to build a very accurate peak meter. A good meter is actually more reliable than a sco; /archives//html/Amps/1999-07/msg00468.html (8,138 bytes)
42. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 26 Jul 1999 13:36:52 -0700; ? I actually used to work in a calibration lab (U.S.N., Pacific Missile Range). To calibrate RF wattmeters, we used a 50-ohm termination, an RF source, and an oscilloscope that was actually calibrat; /archives//html/Amps/1999-07/msg00481.html (8,723 bytes)
43. [AMPS] Re: (score: 1): Author: User312627@aol.com (User312627@aol.com); Date: Mon, 26 Jul 1999 19:08:36 EDT; What does that mean? Meters have a longer MTBF than Oscilloscopes? The waveform envelope is limited by filters to 3000 Hz, an audio limit. But does not the FCC regulations state that the power is to; /archives//html/Amps/1999-07/msg00486.html (8,875 bytes)
44. [AMPS] Re: (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 26 Jul 1999 22:14:48 -0400; Well, they do but that isn't what I meant.You are supposed to read peak envelope power, a good meter will store the highest crest that comes along. It's incorrect to think you need to look at one cy; /archives//html/Amps/1999-07/msg00494.html (10,543 bytes)
45. [AMPS] Re: (score: 1): Author: User312627@aol.com (User312627@aol.com); Date: Mon, 26 Jul 1999 23:12:49 EDT; meters to build charge to the peak, and over 2100 RF cycles on ten meters. I have a book ISBN #0-87259-427-0 titled "FCC RULE BOOK". Ninth Edition. In Chapter nine, page 9-5 I quote: "Q What is peak; /archives//html/Amps/1999-07/msg00496.html (8,930 bytes)
46. [AMPS] Re: (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 27 Jul 1999 00:38:01 -0500; I have always interpreted this to mean that one RF cycle is the MINIMUM time for the measurement. Any shorter look would not define where the crest of the modulation envelope is. (((73))) Phil, K5PC; /archives//html/Amps/1999-07/msg00498.html (8,455 bytes)
47. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 26 Jul 1999 22:55:30 -0700; ? Oscilloscopes can be used to measure peak amplitude of virtually any waveform. Peak amplitude of the RF sinewave and peak envelope amplitude are the same thing. . ? Knowing peak RF amplitude means; /archives//html/Amps/1999-07/msg00501.html (11,745 bytes)
48. [AMPS] Re: (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 27 Jul 1999 09:36:23 +0100; This is the internationally agreed definition; it comes from an ITU recommendation, which is accepted by IEC. Strictly, only a scope can measure it, but in practice, meters are good enough with suita; /archives//html/Amps/1999-07/msg00508.html (9,269 bytes)
49. [AMPS] Re: (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 27 Jul 1999 04:38:07 -0400; You probably take it that way mostly because your reading skills are good and you understand waveshape and power. You don't see the FCC lugging scopes around, because they are poor devices for this a; /archives//html/Amps/1999-07/msg00511.html (9,379 bytes)
50. [AMPS] Re: (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 27 Jul 1999 04:38:08 -0400; No need to guess. Bird calibrates them on a caloric standard. Not a scope in sight. Now there is nothing wrong with using a scope, assuming you have one with the required accuracy and resolution and; /archives//html/Amps/1999-07/msg00512.html (9,416 bytes)
51. [AMPS] Re: (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 27 Jul 1999 08:18:51 +0100; Not against a 'scope, but ultimately against a terminating thermal wattmeter which is the only system that is absolute and verifiably broadband. Scopes and all kinds of "through-line" wattmeters don'; /archives//html/Amps/1999-07/msg00514.html (11,395 bytes)
52. [AMPS] Re: (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 27 Jul 1999 13:14:55 +0100; Sorry, Ian, no because it is a strict definition, applicable in all circumstances - such as, for example, broadband ground searching radar. As applied to amateur radio, then your simplification gener; /archives//html/Amps/1999-07/msg00517.html (9,045 bytes)
53. [AMPS] Re: (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Tue, 27 Jul 1999 15:22:10 +0200; With any voltage-measuring device along a transmission line, there is ambiguity regarding the possibility of placing the probe at a voltage minimum instead of at a voltage maximum (which is presumabl; /archives//html/Amps/1999-07/msg00518.html (10,310 bytes)
54. [AMPS] Re: (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 27 Jul 1999 10:34:44 -0400; Actually they use a meter, and not a scope. And you outlined the reason why the Feds do that. They often park outside and measure FS while someone taps taps on the door. When you let them in they in; /archives//html/Amps/1999-07/msg00523.html (9,384 bytes)
55. [AMPS] Re: (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 27 Jul 1999 10:34:44 -0400; Thank goodness. I thought I was going to have to keep a record of each cycle. Rats. I have to go back to counting the cycle by cycle average power. In the 70's, my log book was millions of pages lon; /archives//html/Amps/1999-07/msg00524.html (9,486 bytes)
56. [AMPS] Re: (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 27 Jul 1999 15:53:45 +0100; OK, Tom, So your own particular definition of PEP is that of a number of cycles. Now what about the PEP of a ground radar, where they put out a very broadband (narrow in time) pulse with rise and fal; /archives//html/Amps/1999-07/msg00525.html (8,840 bytes)
57. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 27 Jul 1999 08:25:52 -0700; Ian ? How does one use a bomb-calorimeter to measure PEP during voice modulation. . ? Yes, such as voltage squared divided by resistance equals watts. // I think it's important to realize that so-cal; /archives//html/Amps/1999-07/msg00528.html (12,466 bytes)
58. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 27 Jul 1999 08:26:00 -0700; ? Peak reading instruments calibrated with a bomb-calorimeter? ? and an ordinary wattmeter would not be subject to such errors, Tom? ? Can you explain why this is true? - cheers, Tom Rich... R. L. M; /archives//html/Amps/1999-07/msg00530.html (9,861 bytes)
59. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 27 Jul 1999 08:25:58 -0700; ? [chortle] Meanwhile, back at the cal lab, a suitable oscilloscope, termination, and multiplier probe are used to calibrate the portable RF wattmeter. ? My Hewlett Packard oscilloscope will display; /archives//html/Amps/1999-07/msg00533.html (10,461 bytes)
60. [AMPS] Re: (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 27 Jul 1999 20:12:34 +0100; One doesn't. As I said, one calibrates the power measuring device on CW, and then one tackles the *separate* question of grabbing the true peak of the modulation. It isn't so much a question of which; /archives//html/Amps/1999-07/msg00542.html (13,011 bytes)

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