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221. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 10:55:48 -0400; See below. Hi Tony, Switching side bands IS the same as tuning your receiver the width of your filter. If you have a 3 KHz wide filter and listening to the upper side band and you tune down 3 KHz wit; /archives//html/Amps/2006-08/msg00469.html (13,418 bytes)
222. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 11:27:09 -0400; See below: Yes tom, you come up with the same numbers that I do. Plus 5.7 KHz and minus 2.4 KHz from the carrier frequency. We really don't care with this kind of test if they all fall in the pass ba; /archives//html/Amps/2006-08/msg00471.html (14,460 bytes)
223. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 11:47:03 -0400; Think about that again. If you are listening to upper side band with a 3 KHz filter and you tune down 3 KHz in frequency with the dial you have moved the band pass the same amount lower in frequency; /archives//html/Amps/2006-08/msg00474.html (11,132 bytes)
224. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 13:00:49 -0400; Yes you are right Tom, my apologies. I forgot to add the offsets in when tuning. An equivalent to changing side bands would be to tune down 3.6 KHz rather than 3 KHz. The transmitter doesn't really; /archives//html/Amps/2006-08/msg00477.html (11,939 bytes)
225. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 14:37:01 -0400; I don't think I used the word "precise" there. How far should we then tune away from the wanted signal for any kind of repeatability? In which direction? Do we tune to several different frequencies; /archives//html/Amps/2006-08/msg00485.html (10,531 bytes)
226. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 15:32:36 -0400; But if we tune outside the range of the roofing filter it is said that we will miss some of the lower order close in IM products. :>) I have some receivers with no roofing filters and they do fine a; /archives//html/Amps/2006-08/msg00488.html (10,806 bytes)
227. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 16:16:22 -0400; The wrong things shouldn't be exaggerated then. We should focus on what really happens. The S meter doesn't measure "peak power". A more correct statement would be it measures the "average power of; /archives//html/Amps/2006-08/msg00489.html (9,754 bytes)
228. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 20:37:26 -0400; How the S meter works has little to do with the measurements being discussed but it is interesting. I agree that most meters are driven from quasi peak detectors from the agc but do not directly res; /archives//html/Amps/2006-08/msg00493.html (12,900 bytes)
229. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 21:38:20 -0400; A strong signal Yes that could happen just as it can with a spectrum analyzer. That's why the main signal is often notched down to look at low level products without overloading effectively increasin; /archives//html/Amps/2006-08/msg00495.html (9,882 bytes)
230. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 14 Aug 2006 22:57:38 -0400; Isn't that an FM radio? If so no good for a spectrum analyzer front end. By the way the HP141 has no less than 4 conversions. 73 Gary K4FMX _______________________________________________ Amps maili; /archives//html/Amps/2006-08/msg00497.html (11,029 bytes)
231. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 15 Aug 2006 11:17:16 -0400; Thanks Mike, I am not familiar with that one. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00508.html (11,364 bytes)
232. Re: [Amps] Checking for IMD (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 15 Aug 2006 11:27:47 -0400; Hi Bill, I assume that you are talking about using a quadrature mixer to get rid of one side band? Seems like it should work. 73 Gary K4FMX _______________________________________________ Amps maili; /archives//html/Amps/2006-08/msg00509.html (10,341 bytes)
233. Re: [Amps] Anodizing aluminum, painting etc. (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 17 Aug 2006 12:42:18 -0400; Some of the confusion about heat sinks I think comes from referring to "mass" of the sink. Mass is really the same thing as weight. Weight of a sink by itself has no real effect on its ability to dis; /archives//html/Amps/2006-08/msg00529.html (9,497 bytes)
234. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 27 Aug 2006 11:15:39 -0500; Joe, Maybe you could tell us where we could read the rest of the story? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2006-08/msg00702.html (12,533 bytes)
235. [Amps] test (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 28 Aug 2006 22:41:08 -0500; test _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00751.html (6,287 bytes)
236. Re: [Amps] Titan 425 Reflected Power (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 25 Sep 2006 10:00:45 -0500; Hi Jim, If I am reading your post correctly it sounds to me that everything is near normal. I don't know the titan amp but assume it operates like most other amps. The first thing you want to do with; /archives//html/Amps/2006-09/msg00309.html (12,975 bytes)
237. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 14 Oct 2006 20:15:57 -0500; You could actually run much higher peak envelope output power under the old rules than you can today. With the new rules we lost ground on the power we are allowed to run. Few realized what really h; /archives//html/Amps/2006-10/msg00122.html (10,974 bytes)
238. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 14 Oct 2006 20:34:55 -0500; There was no limit on the peak envelope power we were allowed to run; only a limit on the average power as read on the plate meters. Peak envelope power can range from 5 to 10 times or greater than; /archives//html/Amps/2006-10/msg00125.html (9,777 bytes)
239. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 15 Oct 2006 10:57:59 -0500; I believe that Bell Labs many years ago published that the ratio of average to peak speech power was 15 or 16 db. As to the .25 second meter time constant I remember reading somewhere that it was acc; /archives//html/Amps/2006-10/msg00137.html (14,671 bytes)
240. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 15 Oct 2006 11:16:44 -0500; Hi Tom, Back then most people did believe that PEP was 2x the average power which was true for a two tone test but not with voice. Even then most manufacturers published specs on amplifiers and radi; /archives//html/Amps/2006-10/msg00138.html (11,935 bytes)

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