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Total 7 documents matching your query.

1. TopBand: Front End Filters (score: 1): Author: jmaass@freenet.columbus.oh.us (Jeffrey Maass); Date: Thu, 23 Oct 1997 21:37:50 -0400 (EDT); Is there a current source for narrow crystal front end filters, like the ones Sherwood marketed in the late 70's? For 160M, they were 5KHz wide, selected by center frequency. I don't see mention of t; /archives//html/Topband/1997-10/msg00381.html (6,826 bytes)
2. Topband: Front End Filters (score: 1): Author: "Dave" <rfsales@freng.com>; Date: Fri, 23 Dec 2016 17:56:07 -0700; About 15 years ago I built a switchable front end crystal filter, I was going to market it but it was too expensive for the Ham market. It covers 1800 to 1850 in 5kHz segments with a slight overlap s; /archives//html/Topband/2016-12/msg00256.html (7,007 bytes)
3. Topband: Front End Filters (score: 1): Author: "K1FZ-Bruce" <k1fz@myfairpoint.net>; Date: Sat, 24 Dec 2016 00:48:21 -0500; The one they are developing for marketing 'can' have 1 KHZ segment crystals channels.. I would encourage anyone to insert a single crystal in their receiver antenna input to see the difference b; /archives//html/Topband/2016-12/msg00258.html (8,377 bytes)
4. Re: Topband: Front End Filters (score: 1): Author: Raoul Coetzee via Topband <topband@contesting.com>; Date: Sat, 24 Dec 2016 06:46:40 +0000 (UTC); surely it is important to have the correct loading on the crystal, just connecting a crystal in the antenna path is not so good?It seems good loading is around 1-3k. Merry Christmas to all.Raoul ZS1; /archives//html/Topband/2016-12/msg00259.html (9,284 bytes)
5. Re: Topband: Front End Filters (score: 1): Author: Rudy Bakalov via Topband <topband@contesting.com>; Date: Sat, 24 Dec 2016 08:46:47 -0500; So what problem are we trying to solve here? If we are solving for SNR, IMHO, good RX antennas provide the best bang for the buck. Today's RX antennas are built on sound engineering principles, have; /archives//html/Topband/2016-12/msg00260.html (9,959 bytes)
6. Re: Topband: Front End Filters (score: 1): Author: "K1FZ-Bruce" <k1fz@myfairpoint.net>; Date: Sat, 24 Dec 2016 09:40:44 -0500; Rudy, Using topband archives. Try going back to the beginninmg of the emails. It started with "thinking out loud", subject then someone changed the subject. 73' Bruce-k1fz So what problem ar; /archives//html/Topband/2016-12/msg00261.html (7,843 bytes)
7. Re: Topband: Front End Filters (score: 1): Author: Rudy Bakalov via Topband <topband@contesting.com>; Date: Sat, 24 Dec 2016 10:28:08 -0500; This is the original ask: "What if we take it a step further, could we limit the band-with of the antenna signal with a crystal lattice for 160 meters before the receiver. Years ago I played around w; /archives//html/Topband/2016-12/msg00262.html (9,326 bytes)

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