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Total 16 documents matching your query.

1. [RTTY] 200 hz filter on RTTY (score: 1): Author: "Don Hill AA5AU" <aa5au@bellsouth.net>; Date: Mon, 31 May 2010 22:04:15 -0500; Test driving a new Icom IC-7600 on consignment from Icom. Tonight there were several us in New Orleans trying to copy E4X on 10140 kHz. There was a very strong steady signal right on his mark frequen; /archives//html/RTTY/2010-05/msg00107.html (7,999 bytes)
2. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Ed Muns" <w0yk@msn.com>; Date: Mon, 31 May 2010 20:34:31 -0700; A passband narrower than about 280 Hz removes some of a 45 baud signal. OTOH, I have used a 200 Hz DSP filter a lot in contests and pileups because removing off-frequency signals is a bigger benefit; /archives//html/RTTY/2010-05/msg00108.html (7,236 bytes)
3. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: Kok Chen <chen@mac.com>; Date: Mon, 31 May 2010 21:42:17 -0700; No, definitely not a myth, Mark-Only (MO) and Space-Only (SO) works quite well. I have used it during times when Mark-Space copy is not possible because QRM is overlapping one, but not both of the to; /archives//html/RTTY/2010-05/msg00109.html (10,389 bytes)
4. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Mon, 31 May 2010 23:12:11 -0700; ORIGINAL MESSAGE: REPLY: RiTTY by K6STI claims to do that. Bryan calls it the "flywheel" mode. I have run RiTTY for years but I have never tried it with literally one tone, but it does copy very, ver; /archives//html/RTTY/2010-05/msg00110.html (7,965 bytes)
5. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: Bernd DC3HB <dc3hb@freenet.de>; Date: Tue, 01 Jun 2010 08:37:33 +0200; Hello Kok, your posting is very interesting! But I have two questions: to implement. 1) Do you know any software with MO/SO other than ritty? 2) How do you decode a weak signal with the 500 Hz Filter; /archives//html/RTTY/2010-05/msg00111.html (12,856 bytes)
6. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Jeff Le Fouler - F6AOJ" <f6aoj@orange.fr>; Date: Tue, 1 Jun 2010 08:55:46 +0200; I am using Frederick model 1632 a commercial / military hardware TU designed in 60's by Irvin M. HOFF W6FFC Mark only or Space only modes are selectable from the front panel and it works perfectly we; /archives//html/RTTY/2010-05/msg00112.html (8,930 bytes)
7. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: Kok Chen <chen@mac.com>; Date: Tue, 01 Jun 2010 02:16:52 -0700; cocoaModem has them. See "Mode" buttons in Figure 10 here: http://homepage.mac.com/chen/w7ay/cocoaModem/UsersManual/RTTYPage/DualRTTY/DualRTTY.html#Fig10 You would use a narrow filter of course if th; /archives//html/RTTY/2010-06/msg00000.html (9,961 bytes)
8. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Tom Osborne" <w7why@verizon.net>; Date: Tue, 01 Jun 2010 09:48:43 -0700; I use 250, with an Inrad filter, all the time for RTTY. Any wider than that is too wide for me. Not sure about narrower as I can't get less than 250 cycles here. The number 2 radio here has a 500 cyc; /archives//html/RTTY/2010-06/msg00003.html (7,843 bytes)
9. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Charlesjr@afgimail.com" <Charlesjr@afgimail.com>; Date: Tue, 1 Jun 2010 13:26:25 -0400; There is actually three carriers on the signal you mentioned. The one in the middle is the strongest. The two weaker ones about 5hz each side from the middle one. I always thought it was a harmonic f; /archives//html/RTTY/2010-06/msg00006.html (9,947 bytes)
10. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Tue, 1 Jun 2010 13:05:06 -0500; Gentlemen, Anyone who knows my call, knows that I **love** crystal filters. But I am confused specifically in the case of RTTY. MMTTY - as well as any other decoding software - all incorporate DSP fi; /archives//html/RTTY/2010-06/msg00008.html (10,129 bytes)
11. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Tue, 01 Jun 2010 15:43:26 -0400; Most of the INRAD "250 Hz" filters are actually 325-275 Hz wide at the - 6dB points as the "250 Hz" is based on cascading a pair of filters in the IF (i.e., Yaesu or Kenwood style). As documented by; /archives//html/RTTY/2010-06/msg00009.html (10,182 bytes)
12. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: Kok Chen <chen@mac.com>; Date: Tue, 01 Jun 2010 12:47:47 -0700; Let me see if I can make it a little cleared with the three "filter selection" (my excuse is English is not my first language, HI HI): (1) To pass the first keying sideband completely, you need to pa; /archives//html/RTTY/2010-06/msg00010.html (11,789 bytes)
13. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Charlesjr@afgimail.com" <Charlesjr@afgimail.com>; Date: Tue, 1 Jun 2010 15:55:52 -0400; Allan, No question is ignorant. During contest I use it with Writelog. I think WL and one other software package is the only one's RITTY will work with. You loose some of the function(s) but not it's; /archives//html/RTTY/2010-06/msg00011.html (12,890 bytes)
14. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Tue, 1 Jun 2010 15:01:41 -0500; Thank you Chen, I am happy to have remembered the summary of your earlier comments. I find using an extremely narrow crystal filter to be difficult for the tuning reason you mentioned. In S&P especia; /archives//html/RTTY/2010-06/msg00012.html (14,520 bytes)
15. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: Kok Chen <chen@mac.com>; Date: Tue, 01 Jun 2010 13:13:17 -0700; Oops, that should have been "Notice you can even copy an RTTY signal with a 170 Hz filter, but the error rate will be quite high." 73 Chen, W7AY _______________________________________________ RTTY m; /archives//html/RTTY/2010-06/msg00013.html (8,054 bytes)
16. Re: [RTTY] 200 hz filter on RTTY (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Tue, 1 Jun 2010 16:20:03 -0500; Joe, You are right. I think we discussed the shape factor of the K3 250 hz 8 pole design earlier on the board few months back. I have the same memory as you. The shape factor (if you want to use that; /archives//html/RTTY/2010-06/msg00015.html (13,176 bytes)

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