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Total 18 documents matching your query.

1. Topband: BDR redux (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Thu, 5 Feb 2004 17:03:58 -0000; Ok, Ok... dB = 20 log (v2/v1) It was early...not enough caffeine, and I swagged instead of calculating. To make matters worse, at some point I switched from dBm to dBv. DUH. Thanks to all who reminde; /archives//html/Topband/2004-02/msg00079.html (7,411 bytes)
2. Topband: BDR redux (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Thu, 05 Feb 2004 14:55:32 -0500; S9 is 50 uV in Orion. calibrated in dBm? No, AGC Threshold is set in uV and ranges from 0.37 uV to 192 uV. AGC Threshold is the most unusual aspect of Orion since we've never had anything like it bef; /archives//html/Topband/2004-02/msg00083.html (10,674 bytes)
3. Re: Topband: BDR redux (score: 1): Author: John Kaufmann <john.kaufmann@verizon.net>; Date: Thu, 5 Feb 2004 15:42:24 -0500; I found exactly the same thing during my first extended operating time with the Orion during the recent CQ160 contest. I realized immediately that the 3uV default AGC threshold value is way too low f; /archives//html/Topband/2004-02/msg00086.html (8,789 bytes)
4. Re: Topband: BDR redux (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Thu, 05 Feb 2004 16:38:16 -0500; We've been enjoying "AGC Treshold" for many decades, although we didn't use the name until the recent marketing breakthroughs :-) AGC threshold determines the point above which AGC loop is operationa; /archives//html/Topband/2004-02/msg00088.html (7,803 bytes)
5. Re: Topband: BDR redux (score: 1): Author: "Doug Waller" <NX4D@comcast.net>; Date: Thu, 5 Feb 2004 19:17:38 -0500; The Orion sure sounds like a FB receive rig to me. I am still using the trusty FT-1000MP, but with some exciting modifications for topband reception. Using a SCAF-1 audio filter with two back-to-bac; /archives//html/Topband/2004-02/msg00092.html (10,065 bytes)
6. Re: Topband: BDR redux (score: 1): Author: "on4kj" <on4kj@skynet.be>; Date: Fri, 6 Feb 2004 12:04:46 +0100; Two diodes back to back in front of a receiver is'nt that a bit of a simple? My first thought in this case goes to a " Fourier series Delight ". Must be hard to correct by a audio filter. What say ?; /archives//html/Topband/2004-02/msg00099.html (7,759 bytes)
7. Re: Topband: BDR redux (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 6 Feb 2004 06:56:32 -0500; Two diodes back-to-back in front of all the filters would absolutely kill reception if the signals were limited in the diodes! The IM and general "crud" would be horrible. A soft limiter after the f; /archives//html/Topband/2004-02/msg00100.html (9,184 bytes)
8. Re: Topband: BDR redux (score: 1): Author: Tim Duffy K3LR <k3lr@k3lr.com>; Date: Fri, 06 Feb 2004 09:00:14 -0600; That being said, how hard would it be to find the Orion AGC parameters that would cause the exact same AGC characteristics as the R4C? 73, Tim K3LR _______________________________________________ Top; /archives//html/Topband/2004-02/msg00105.html (10,306 bytes)
9. Re: Topband: BDR redux (score: 1): Author: "Doug Waller" <NX4D@comcast.net>; Date: Fri, 6 Feb 2004 10:08:13 -0500; If all signals entering the antenna input of a receiver were weak signals, including noise, then receiver specs would be of little concern. Audio gain could be turned wide open for easy copy. Presie; /archives//html/Topband/2004-02/msg00107.html (11,277 bytes)
10. Re: Topband: BDR redux (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Fri, 6 Feb 2004 09:53:16 -0600; from W8JI out clamp -- Tom's note illustrates why AGC action in our receivers requires our attention -- right after phase noise, IMD dynamic range and key clicks. Simple first-order AGC loops (or 2nd; /archives//html/Topband/2004-02/msg00109.html (9,437 bytes)
11. Re: Topband: BDR redux (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 6 Feb 2004 11:32:00 -0500; in the signals separation by I initially took the opposite approach. I constructed a totally separate AGC board with variable but very high gain in my R4C's. What I found was the more gain I used in; /archives//html/Topband/2004-02/msg00112.html (10,378 bytes)
12. Topband: BDR redux (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Fri, 06 Feb 2004 13:31:29 -0500; that threshold, which is probably excellent for smooth steady noise. Maybe Bill or someone else knows how. The way I think of this in Orion is Threshold is the "coarse" adjustment set for a particul; /archives//html/Topband/2004-02/msg00116.html (9,686 bytes)
13. Re: Topband: BDR redux (score: 1): Author: "Robert McGwier" <rwmcgwier@comcast.net>; Date: Sat, 7 Feb 2004 15:32:29 -0000; Tom: I am attempting to capture good AGC action in the next release of the SDR-1000 software (which is a major rework, using different tools, libraries, programming style and VB is gone forever and u; /archives//html/Topband/2004-02/msg00123.html (10,287 bytes)
14. Re: Topband: BDR redux (score: 1): Author: "Oleg Skydan" <skidan@mail.ints.net>; Date: Tue, 10 Feb 2004 08:02:20 +0200; Hi, Bob, I have made a lot of experiments with my AGC design in my T03DSP transceiver (http://users.ints.net/skidan/T03DSP/ ). The latest experiment was with the AGC static response. I tryed a system; /archives//html/Topband/2004-02/msg00143.html (12,377 bytes)
15. Re: Topband: BDR redux (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 10 Feb 2004 10:05:02 -0500; What I find better is 10dB signal = 10dB audio change at noise floor becoming 10dB=1dB or less audio change at some higher level. It gets rid of the "mush" or blend of signals and noise when the noi; /archives//html/Topband/2004-02/msg00148.html (8,634 bytes)
16. Re: Topband: BDR redux (score: 1): Author: "Oleg Skydan" <skidan@mail.ints.net>; Date: Tue, 10 Feb 2004 19:05:51 +0200; Hi, All and Tom, of but Ok. That is why I did not find much difference in my experiments - I can set up the maximum gain and AGC threshold with the "RF Gain" control from the front panel. The AGC is; /archives//html/Topband/2004-02/msg00149.html (8,650 bytes)
17. RE: Topband: BDR redux (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Tue, 10 Feb 2004 21:10:00 -0500; All the discussion on AGC got me interested in finding out why the IC-781 has the most transparent AGC action I've found among all the radios I've used. By transparent, I mean it doesn't get in the w; /archives//html/Topband/2004-02/msg00152.html (10,566 bytes)
18. Re: Topband: BDR redux (score: 1): Author: "Oleg Skydan" <skidan@mail.ints.net>; Date: Wed, 11 Feb 2004 09:04:25 +0200; Hi, John and All, Thank you very much for the information about AGC in IC-781. I can add just a few comments no I tryed an AGC with flat response above threshold (and my AGC does so when receiving th; /archives//html/Topband/2004-02/msg00156.html (8,534 bytes)

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