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Total 10 documents matching your query.

1. [TenTec] Preselector for SDR (score: 1): Author: Rich Jones via TenTec <tentec@contesting.com>; Date: Fri, 16 Sep 2016 16:28:15 +0000 (UTC); QEX magazine May/June 2008 M0MWA presents a computer controlled turnable bandpass filter (preselector)for use with software defined radios.1.8-30 mhz article includes schematics. Good luck, Rich K8; /archives//html/TenTec/2016-09/msg00262.html (7,497 bytes)
2. Re: [TenTec] Preselector for SDR (score: 1): Author: Gary J FollettDukes HiFi <dukeshifi@comcast.net>; Date: Fri, 16 Sep 2016 11:50:15 -0500; One might think this device would help analog radios as well. Most lack the preselector feature and have half octave filters, which may be inadequate in some situations. Gary ________________________; /archives//html/TenTec/2016-09/msg00265.html (7,928 bytes)
3. Re: [TenTec] Preselector for SDR (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Fri, 16 Sep 2016 14:17:04 -0700; There is an important difference between a pre-selector and a bandpass filter, at least for the application that Rick has raised -- it's bandwidth. The issue that he has raised, and it can be a VERY; /archives//html/TenTec/2016-09/msg00269.html (9,185 bytes)
4. Re: [TenTec] Preselector for SDR (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 16 Sep 2016 17:50:55 -0400; Jim, Good points, although as I look at the HEROS passpand plot -- and although it may first appear wide on the graph, it looks reasonably close to the preselector response we see from Collins 75S or; /archives//html/TenTec/2016-09/msg00270.html (10,499 bytes)
5. Re: [TenTec] Preselector for SDR (score: 1): Author: Spencer <w1gak@arrl.net>; Date: Fri, 16 Sep 2016 19:54:12 -0600; A well constructed magnetic loop works very well. Not easy to do. _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinf; /archives//html/TenTec/2016-09/msg00271.html (7,461 bytes)
6. Re: [TenTec] Preselector for SDR (score: 1): Author: "rick@dj0ip.de" <Rick@DJ0IP.de>; Date: Sat, 17 Sep 2016 10:31:55 +0200; Paul, I can't comment on the effectiveness of 10dB attenuation with these modern SDR receivers/transceivers because I haven't used any of them. I currently have one tiny QRP SDR transceiver and it do; /archives//html/TenTec/2016-09/msg00273.html (13,161 bytes)
7. Re: [TenTec] Preselector for SDR (score: 1): Author: "rick@dj0ip.de" <Rick@DJ0IP.de>; Date: Sat, 17 Sep 2016 10:34:57 +0200; And not very contest-effective! 73 - Rick, DJ0IP (Nr. Frankfurt, Germany) A well constructed magnetic loop works very well. Not easy to do. _______________________________________________ TenTec mail; /archives//html/TenTec/2016-09/msg00274.html (8,427 bytes)
8. Re: [TenTec] Preselector for SDR (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Sat, 17 Sep 2016 09:26:08 -0700; It would work quite well as a receive antenna. And yes, magnetic loops are well known to have quite narrow bandwidth, which would allow nulling interference along one axis. N6RK uses a magnetic RX lo; /archives//html/TenTec/2016-09/msg00280.html (8,922 bytes)
9. Re: [TenTec] Preselector for SDR (score: 1): Author: Spencer <w1gak@arrl.net>; Date: Sat, 17 Sep 2016 11:09:41 -0600; Jim Brown wrote: t would work quite well as a receive antenna. And yes, magnetic loops are well known to have quite narrow bandwidth, which would allow nulling interference along one axis. N6RK uses; /archives//html/TenTec/2016-09/msg00283.html (8,818 bytes)
10. Re: [TenTec] Preselector for SDR (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Sat, 17 Sep 2016 20:50:55 -0700; Seems like all those hams with their RVs need an education about RFI from their own stuff! NO ham should be using any switch-mode power supplies that are external to equipment. It's relatively easy t; /archives//html/TenTec/2016-09/msg00285.html (9,135 bytes)

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