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61. 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)
62. 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)
63. Re: [Amps] Checking for IMD (score: 1): Author: "Joe Subich, W4TV" <w4tv@subich.com>; Date: Mon, 14 Aug 2006 16:59:52 -0400; That is possible depending on the frequencies and tone spacing, That depends entirely on the receiver gain distribution and AGC performance. Many receivers use AGC to turn down front end gain to pre; /archives//html/Amps/2006-08/msg00490.html (9,893 bytes)
64. Re: [Amps] Checking for IMD (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 14 Aug 2006 19:19:58 -0400; That's what I'm doing. Not any meter I've seen. They almost always work from the AGC. The AGC is generally a peak detection system with rapid attack and slow decay, with the exception that a good we; /archives//html/Amps/2006-08/msg00492.html (10,228 bytes)
65. 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)
66. Re: [Amps] Checking for IMD (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 14 Aug 2006 21:01:21 -0400; You took that wrong. My point is we should learn what it does and call it what it actually is. I didn't say from a receiver with good IM response but a lot of unusual things can happen. Receivers ca; /archives//html/Amps/2006-08/msg00494.html (8,952 bytes)
67. 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)
68. Re: [Amps] Checking for IMD (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 14 Aug 2006 19:40:43 -0700; Sounds like the Flex Radio SDR-1000 would be ideally suited for this task. It has very a simple conversion scheme, high dynamic-range, and no analog AGC (either derived or applied). With a 44 KHz sam; /archives//html/Amps/2006-08/msg00496.html (9,676 bytes)
69. 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)
70. Re: [Amps] Checking for IMD (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 14 Aug 2006 20:17:14 -0700; No, Gary, it's an HF receiver/transceiver that uses a PC soundcard to handle IF filtering and demodulation: http://www.flex-radio.com/ http://www.flex-radio.com/articles_files/SDR-1000%20April%202005; /archives//html/Amps/2006-08/msg00498.html (9,832 bytes)
71. Re: [Amps] Checking for IMD (score: 1): Author: "m.ford" <k1ern@pioneerwireless.net>; Date: Tue, 15 Aug 2006 06:44:50 -0400; Am I the only one on earth that has been looking at the SDR-14 ?? It is now 1100 up from 1000. Pretty cheap for a FFT analyzer that will change the way you think about the radio spectrum. There is no; /archives//html/Amps/2006-08/msg00502.html (9,824 bytes)
72. Re: [Amps] Checking for IMD (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 15 Aug 2006 08:53:57 -0400; Now we are back to my first suggestion. Use a good mixer and local oscillator to feed a sound card. If you don't need more than 20kHz bandwidth you don't need the quadrature oscillator and mixers whi; /archives//html/Amps/2006-08/msg00503.html (11,163 bytes)
73. Re: [Amps] Checking for IMD (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Tue, 15 Aug 2006 06:18:46 -0700; "There is nothing new about using an SA for a receiver. And there is nothing new about using a receiver for a SA." Years ago, a friend of mine hooked up a $27,000 Tektronix SA to a 4 element beam and; /archives//html/Amps/2006-08/msg00505.html (9,164 bytes)
74. Re: [Amps] Checking for IMD (score: 1): Author: Gudguyham@aol.com; Date: Tue, 15 Aug 2006 09:23:51 EDT; Years ago, a friend of mine hooked up a $27,000 Tektronix SA to a 4 element beam and made a qso on 20 meter cw. Only problem was keying it - he had to insert the key in the antenna line. 73, Colin K7; /archives//html/Amps/2006-08/msg00506.html (7,979 bytes)
75. 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)
76. 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)
77. Re: [Amps] Checking for IMD (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Tue, 15 Aug 2006 15:33:04 +0100; Colin, Don't prompt me to start a business making 50 Ohm Morse keys! (Of course there would be at least two models in the range - one for 100 Watt and one for 1500 Watt - and the word 'miracle' or si; /archives//html/Amps/2006-08/msg00510.html (9,290 bytes)
78. Re: [Amps] Checking for IMD (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Tue, 15 Aug 2006 11:11:59 -0500; The price no doubt would be dependent on the quality of the dummy load switched in at key-up. :) 73, Keith NM5G Colin, Don't prompt me to start a business making 50 Ohm Morse keys! (Of course there w; /archives//html/Amps/2006-08/msg00511.html (9,975 bytes)

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