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Total 8 documents matching your query.

1. Topband: The AM Brick Wall (score: 1): Author: "Tod-MN" <tod@k0to.us>; Date: Mon, 22 Jan 2007 17:27:26 -0600; Has anyone more information regarding the schematic and values for this filter? Is it commercially available or is it 'one of a kind' and made of unobtanium? Tod, K0TO _______________________________; /archives//html/Topband/2007-01/msg00369.html (6,835 bytes)
2. Topband: The AM Brick Wall (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 23 Jan 2007 09:39:22 -0500; Regarding: http://www.dallas.net/~jvpoll/Filter/TheAMBrickWall.html "Attenuates ALL signals in the AM broadcast - with a spec'd minimum 40 dB of attenuation beginning at 1700 KHz" filter? Is it comme; /archives//html/Topband/2007-01/msg00372.html (7,085 bytes)
3. Re: Topband: The AM Brick Wall (score: 1): Author: "Ian Keyser" <ian.keyser@btopenworld.com>; Date: Tue, 23 Jan 2007 15:12:22 -0000; I've just built the one in ON4UN's book and it is superb. Mine is 1dB down at 1770KHz and when properly terminated exceeds -40 after that..... When I wound the inductors to the figs stated it was 'of; /archives//html/Topband/2007-01/msg00373.html (6,910 bytes)
4. Re: Topband: The AM Brick Wall (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 25 Nov 2010 11:10:31 -0500; Hijacking an old e-mail for new information ... For those looking for solutions to eliminate/reduce overload from nearby AM broadcast transmitters, Jack Smith, W8OZA at Clifton Laboratories now has t; /archives//html/Topband/2010-11/msg00108.html (8,560 bytes)
5. Re: Topband: The AM Brick Wall (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 25 Nov 2010 16:53:07 -0800; Sorry to be a wet blanket, but now that the AM broadcast band extends to 1.7 MHz, you really have to use an elliptic function (AKA Cauer) filter, not a Chebyshev. There are several of those on the ma; /archives//html/Topband/2010-11/msg00112.html (9,729 bytes)
6. Re: Topband: The AM Brick Wall (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 25 Nov 2010 20:25:28 -0500; Fortunately allocations at the top end of the MW band tend to be "local" or regional ... typically 5 KW or so ... not the 50 KW monsters found lower in the band. Unless one lives right next door to a; /archives//html/Topband/2010-11/msg00113.html (10,412 bytes)
7. Re: Topband: The AM Brick Wall (score: 1): Author: "GEORGE WALLNER" <aa7jv@atlanticbb.net>; Date: Fri, 26 Nov 2010 20:14:35 -0500; I have a 50 kW BC station on 1530 kHz about 1.6 miles from my QTH, with mostly salt water between us. The signal level on my 90 foot Vertical is over 20 dBm. When you touch a wire to the feedpoint y; /archives//html/Topband/2010-11/msg00116.html (7,538 bytes)
8. Re: Topband: The AM Brick Wall (score: 1): Author: "Jim McDonald" <jim@n7us.net>; Date: Fri, 26 Nov 2010 20:09:46 -0600; I've used the BCB filters from ICE and was satisfied with their performance in my situation. http://www.iceradioproducts.com/filtersrf.html#bcb Jim N7US --Original Message-- I have a 50 kW BC station; /archives//html/Topband/2010-11/msg00117.html (8,180 bytes)

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