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1. [RTTY] RTTY spectrum analysis article (score: 1): Author: "aflowers@frontiernet.net" <aflowers@frontiernet.net>; Date: Wed, 9 Jan 2013 18:39:27 -0800 (PST); Fellow RTTY operators, I had some interesting private emails about the spectra I posted here, especially about the now infamous "Signal 3". If you haven't seen Signal 3, you might want to look a; /archives//html/RTTY/2013-01/msg00170.html (9,174 bytes)
2. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Robert Chudek - K0RC <k0rc@citlink.net>; Date: Wed, 09 Jan 2013 21:33:38 -0600; Hello Andy... Wow! An excellent article with a lot of detailed work you (and others) put into this analysis. It really should be published in a magazine(s) with a world-wide audience. I agree that th; /archives//html/RTTY/2013-01/msg00172.html (10,677 bytes)
3. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Thu, 10 Jan 2013 09:30:08 -0500; That was depressing. Transmit filters are only enabled on the Icom radios I have on SSB, so there is no apparent option for improvement that I can see for without switching to AFSK which, in turn, m; /archives//html/RTTY/2013-01/msg00173.html (8,184 bytes)
4. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Thu, 10 Jan 2013 08:34:13 -0600; The best place for RTTY rx filtering is in the demod, not the rig. narrow crystal filter and it's group delay gives more problems than it solves. The solution is to run a filter wide enough to let yo; /archives//html/RTTY/2013-01/msg00174.html (9,590 bytes)
5. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Thu, 10 Jan 2013 09:44:39 -0500; Then how do you keep strong signals in the passband of the (now wider) rig filter away from the AGC in the rig? Attenuating a strong signal now in the passband also attenuates the weak adjacent ones; /archives//html/RTTY/2013-01/msg00175.html (9,437 bytes)
6. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Jim W7RY" <w7ry@centurytel.net>; Date: Thu, 10 Jan 2013 07:03:03 -0800; I disagree Jeff. If an S2 signal you are trying to receive is 300 or 400 Hz away from a S9+20 signal, the radios AGC will not allow you to receive the week signal. Filters in the radio are essential!; /archives//html/RTTY/2013-01/msg00176.html (10,782 bytes)
7. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Thu, 10 Jan 2013 09:11:58 -0600; That may be the case. Then again, a s9+20 300 hz away from a s2 is going to have more in-band signal content on top of the s2 - at least enough to wipe that signal out. Now maybe that +20 is super cl; /archives//html/RTTY/2013-01/msg00177.html (11,319 bytes)
8. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 10 Jan 2013 10:22:59 -0500; Then how do you keep strong signals in the passband of the (now wider) rig filter away from the AGC in the rig? 400 Hz is nearly the minimum bandwidth necessary for proper decoding (minimum intersymb; /archives//html/RTTY/2013-01/msg00178.html (11,610 bytes)
9. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Jim W7RY" <w7ry@centurytel.net>; Date: Thu, 10 Jan 2013 07:31:36 -0800; I use 250 Hz crystal filters in my IC751A in bot the 9MHz and 455 KHz IF. I use 250 Hz DSP filters in my IC-7600 ALL the time. Works perfectly. I use MMTTY, 2Tone and a HAL-ST8000 for decoders. 73 Ji; /archives//html/RTTY/2013-01/msg00179.html (13,014 bytes)
10. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 10 Jan 2013 07:46:54 -0800; REPLY: Interesting. For years I used 250 Hz filtering in my IC-765Pro3, so when I got my new IC-7600 I set it the same way. The reception seemed pretty poor, so on a hunch I widened it out to 300 Hz; /archives//html/RTTY/2013-01/msg00180.html (8,894 bytes)
11. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Kok Chen <chen@mac.com>; Date: Thu, 10 Jan 2013 08:14:39 -0800; That is perfectly correct. Lets assume the receiver uses a Raised Cosine filter which has been designed to be the narrowest possible demodulation data filter with no intersymbol interference (ISI). T; /archives//html/RTTY/2013-01/msg00181.html (11,458 bytes)
12. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Dave Greig <daven3buo@att.net>; Date: Thu, 10 Jan 2013 10:52:29 -0600; Question. Is there a simple RF sampling device and software that will allow the RTTY RF signal to viewed? Thank You! Dave Greig N3BUO Phone: (682) 422-6667 Twitter: @N3BUO Facebook: https://www.faceb; /archives//html/RTTY/2013-01/msg00182.html (12,735 bytes)
13. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: " pcooper" <pcooper@guernsey.net>; Date: Thu, 10 Jan 2013 09:41:20 -0800; Hi all, I must have missed the original posting about this subject, but just wanted to the thoughts from Bill W6WRT with respect to the new Icom rigs. Bill wrote: "Interesting. For years I used 250 H; /archives//html/RTTY/2013-01/msg00184.html (9,507 bytes)
14. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 10 Jan 2013 12:51:08 -0500; Phil, Using the "soft" option instead of the hardest (steepest) may help with regard to the narrow bandwidths as the softer skirts/more gentle change from passband to stopband should result in lower; /archives//html/RTTY/2013-01/msg00186.html (10,093 bytes)
15. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Kok Chen <chen@mac.com>; Date: Thu, 10 Jan 2013 14:07:48 -0800; Both K0SM and I have used a directional coupler for our separate work. I think Andy uses some professional directional coupler. I myself use the directional coupler kit from Elecraft. I wired my coup; /archives//html/RTTY/2013-01/msg00191.html (10,958 bytes)
16. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Robert Chudek - K0RC <k0rc@citlink.net>; Date: Thu, 10 Jan 2013 18:25:57 -0600; One of the best investments I made many years ago was a *Bird 4431 Wattmeter*. It looks like the standard Bird 43 which uses interchangeable 'slugs' to measure different power levels and frequency ra; /archives//html/RTTY/2013-01/msg00193.html (12,388 bytes)
17. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 10 Jan 2013 17:27:31 -0800; REPLY: I use a standard T-connector in the coax line and tap off the "T" using a capacitor made of twisted insulated wire. Works for me. Bill, W6WRT _______________________________________________ RT; /archives//html/RTTY/2013-01/msg00194.html (9,375 bytes)
18. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "Paul" <w8aef@q.com>; Date: Thu, 10 Jan 2013 19:22:26 -0700; There was an article in a recent QST that uses a UHF T connector. Unscrew the male pin, cut off the threaded extension, push the male pin back in to the adapter and you have a capacity coupled RF Sam; /archives//html/RTTY/2013-01/msg00195.html (10,158 bytes)
19. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: "aflowers@frontiernet.net" <aflowers@frontiernet.net>; Date: Thu, 10 Jan 2013 20:33:13 -0800 (PST); Coincidentally, the audio files in the article are almost perfectly representative of an S2 signal and a S9+20 signal 400 Hz away (which would be 62db with 6db per S unit). I'm measuring the gap betw; /archives//html/RTTY/2013-01/msg00196.html (11,059 bytes)
20. Re: [RTTY] RTTY spectrum analysis article (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Thu, 10 Jan 2013 20:55:26 -0800; REPLY: Clever. I'll give it a try. Thanks. Bill, W6WRT _______________________________________________ RTTY mailing list RTTY@contesting.com http://lists.contesting.com/mailman/listinfo/rtty; /archives//html/RTTY/2013-01/msg00197.html (9,601 bytes)

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