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Total 54 documents matching your query.

41. Re: [TenTec] SDR-1000 (score: 1): Author: "James Duffer" <dufferjames@hotmail.com>; Date: Wed, 12 Jul 2006 21:06:01 -0500; Is this -160 dbm? What is the level of ambient noise? Would it be less than 1 micromicromicromicro watts. The point is what good is having a sensitivity that would allow detection of signals that are; /archives//html/TenTec/2006-07/msg00388.html (8,825 bytes)
42. Re: [TenTec] SDR-1000 (score: 1): Author: CATFISHTWO@aol.com; Date: Thu, 13 Jul 2006 14:37:48 EDT; I am not suggesting that at all, and taken out of context it does sound wrong, I reiterate , please. if you have a problem and it happens when you do A,B and C and it causes X problem, then by all me; /archives//html/TenTec/2006-07/msg00394.html (10,043 bytes)
43. Re: [TenTec] SDR-1000 (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Thu, 13 Jul 2006 20:04:54 -0500; You might want to control the antenna tuners as their tuning process always introduces phase shift. That's how broadcast array drive networks are tuned, with T, pi or L networks to introduce the the; /archives//html/TenTec/2006-07/msg00396.html (12,153 bytes)
44. Re: [TenTec] SDR-1000 (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Thu, 13 Jul 2006 21:30:58 -0500; The noise floor is not a stable signal level, nor uniform over the world. There are quiet locations and quiet times, some predictable, and some not. Then there may be some signal processing technique; /archives//html/TenTec/2006-07/msg00398.html (8,929 bytes)
45. Re: [TenTec] SDR-1000 (score: 1): Author: "Geoffrey S. Mendelson" <gsm@mendelson.com>; Date: Fri, 14 Jul 2006 10:15:41 +0300; Very "sound" advice. Often manufacturers change the chipset on a card without changing the model number. While I can't pinpoint specific sound cards like that, I do have several with the same "chip"; /archives//html/TenTec/2006-07/msg00403.html (10,589 bytes)
46. [TenTec] SDR-1000 (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 14 Jul 2006 08:56:49 -0400; Hi Lee, Thanks for your responses. I emphasize that I may well be one of the first to get an SDR-X (2 RX version) because of its potential for inband interference rejection, but I simply question the; /archives//html/TenTec/2006-07/msg00408.html (12,845 bytes)
47. Re: [TenTec] SDR-1000 (score: 1): Author: Lee A Crocker <lee_crocker@yahoo.com>; Date: Fri, 14 Jul 2006 07:52:01 -0700 (PDT); Gerry I was thinking tuners AND transmitters. If you have 4 transmitters and 4 tuners idependently feeding the 4 elements of an array you have very good control of everything over a large bandwidth.; /archives//html/TenTec/2006-07/msg00412.html (8,224 bytes)
48. [TenTec] SDR-1000 (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 14 Jul 2006 20:02:56 -0400; can never, no matter how much software it has, equal the performance of a Ten Tec receiver in the Orion. You can't put selectivity after the front end and fix problems inherent to the front end. That; /archives//html/TenTec/2006-07/msg00440.html (8,820 bytes)
49. Re: [TenTec] SDR-1000 (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 14 Jul 2006 19:35:26 -0500; What size should the Orion use? -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec mailing list TenTec@contest; /archives//html/TenTec/2006-07/msg00445.html (9,359 bytes)
50. Re: [TenTec] SDR-1000 (score: 1): Author: "James Duffer" <dufferjames@hotmail.com>; Date: Fri, 14 Jul 2006 06:47:43 -0500; I was under the impression that noise was partially caused by temperature (molecular activity). I know that the sun causes noise, as I used to observe the sun strobe on the FAA long range radar I mai; /archives//html/TenTec/2006-07/msg00449.html (10,785 bytes)
51. Re: [TenTec] SDR-1000 (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 14 Jul 2006 20:22:08 -0500; -114 DBM is a pretty good MDS for radar bandwidth. For CW bandwidth, MDS of -148 dBm is pretty good. Noise power goes with the square of bandwidth. Noise is generated by random electron motion. Its a; /archives//html/TenTec/2006-07/msg00455.html (10,148 bytes)
52. Re: [TenTec] SDR-1000 (score: 1): Author: "Jim" <jdunbar28@mchsi.com>; Date: Sat, 15 Jul 2006 06:37:44 -0500; This is the main reason that the majority of happy Ten Tec users, Yaesu Users, Force 12 Users, and Stepp-IR users, DO not subscribe to any of these reflectors. I am going to call it what it is...so i; /archives//html/TenTec/2006-07/msg00461.html (12,773 bytes)
53. Re: [TenTec] SDR-1000 (score: 1): Author: "James Duffer" <dufferjames@hotmail.com>; Date: Sat, 15 Jul 2006 08:14:50 -0500; What is your take on the post which stated the SDR-1000 was to have a MDS of "-160?" My two main HF radios, an Omni VI, and a FT-1000D have, I believe a decent MDS, but it still seems that ambient no; /archives//html/TenTec/2006-07/msg00469.html (11,511 bytes)
54. Re: [TenTec] SDR-1000 (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Sat, 15 Jul 2006 12:22:29 -0500; It all depends on the bandwidth. Given a 5 Hz bandwidth, -160 dBm MDS would be gross. In a 20 KHz bandwidth, -160 would be stupendous, unbelievable, possible only with several minutes of averaging. M; /archives//html/TenTec/2006-07/msg00470.html (10,798 bytes)

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