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Total 9 documents matching your query.

1. [RTTY] LMS Notch filter (score: 1): Author: "Harry Coates" <wa8hc1@charter.net>; Date: Fri, 24 Feb 2012 16:43:09 -0500; I've been using the LMS Notch filter for years.. It makes a great quasi TwinPeakFilter.. Work with the Settings and Show fearure untill you get a - 60 to -70 db notch.. Set the NOT button ON and move; /archives//html/RTTY/2012-02/msg00308.html (7,056 bytes)
2. Re: [RTTY] LMS Notch filter (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Fri, 24 Feb 2012 15:46:36 -0600; Is there a benefit when using a twin peak filter (of whatever implementation) - assuming there is only one signal within the passband? 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie I've been u; /archives//html/RTTY/2012-02/msg00310.html (7,653 bytes)
3. Re: [RTTY] LMS Notch filter (score: 1): Author: Kok Chen <chen@mac.com>; Date: Fri, 24 Feb 2012 14:40:07 -0800; An arbitrary twin peak filter can actually be detrimental if the software modem or TU already includes an optimal filter (a Matched Filter or Raised Cosine filter that are designed for the specific b; /archives//html/RTTY/2012-02/msg00311.html (9,929 bytes)
4. Re: [RTTY] LMS Notch filter (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Fri, 24 Feb 2012 16:49:10 -0600; Thanks Chen for the comments. I wonder if the filter implementation realized in MMTTY is known to someone in the group? 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie An arbitrary twin peak fil; /archives//html/RTTY/2012-02/msg00312.html (10,411 bytes)
5. Re: [RTTY] LMS Notch filter (score: 1): Author: "Harry Coates" <wa8hc1@charter.net>; Date: Fri, 24 Feb 2012 18:33:01 -0500; _______________________________________________ RTTY mailing list RTTY@contesting.com http://lists.contesting.com/mailman/listinfo/rtty; /archives//html/RTTY/2012-02/msg00313.html (9,217 bytes)
6. Re: [RTTY] LMS Notch filter (score: 1): Author: "Dave AA6YQ" <aa6yq@ambersoft.com>; Date: Fri, 24 Feb 2012 18:38:31 -0500; The AA6YQ-FIR-512 profile configures MMTTY's Bandpass and Notch filters to emulate a dual peak filter. It's parameters were chosen empirically to optimize decoding of a -10db SNR (AWGN) .wav file pro; /archives//html/RTTY/2012-02/msg00314.html (12,298 bytes)
7. Re: [RTTY] LMS Notch filter (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Fri, 24 Feb 2012 17:43:55 -0600; Harry, I hear what you are saying. But what looks good to a human eye as a filter setting may not actually help the decoding. A good example of this is the guys raving about this or that crystal filt; /archives//html/RTTY/2012-02/msg00315.html (9,575 bytes)
8. Re: [RTTY] LMS Notch filter (score: 1): Author: Kok Chen <chen@mac.com>; Date: Fri, 24 Feb 2012 16:45:57 -0800; As seen from Figure 4 of the Extended Nyquist Filter article that I just posted a few minutes earlier, the Raised Cosine and Matched filter both comes up with better than 13% character error rate for; /archives//html/RTTY/2012-02/msg00317.html (9,822 bytes)
9. Re: [RTTY] LMS Notch filter (score: 1): Author: "Dave AA6YQ" <aa6yq@ambersoft.com>; Date: Fri, 24 Feb 2012 20:19:40 -0500; 21% As seen from Figure 4 of the Extended Nyquist Filter article that I just posted a few minutes earlier, the Raised Cosine and Matched filter both comes up with better than 13% character error rat; /archives//html/RTTY/2012-02/msg00318.html (9,287 bytes)

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