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1. [RTTY] 2Tone Chirp (score: 1): Author: David G3YYD <g3yyd@btinternet.com>; Date: Mon, 16 Dec 2013 10:27:38 +0000; As you can see I have joined this reflector. The start up sequence of 2Tone is just as Chen, W7AY, describes. This is intentional as I will explain. When receiving using 2Tone in normal mode it asses; /archives//html/RTTY/2013-12/msg00117.html (8,638 bytes)
2. Re: [RTTY] Roundup observations - a bit long! (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Mon, 06 Jan 2014 15:48:31 -0500; Phil I sympathise about the DQRM. I started in RTTY in the early 70s when machines ruled the RTTY world. We used to get a lot of guys call CQ over us using CW because they thought we were commercial.; /archives//html/RTTY/2014-01/msg00062.html (7,516 bytes)
3. Re: [RTTY] Roundup observations - a bit long! (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Tue, 07 Jan 2014 07:34:52 -0500; Nor does it have a Multi-Multi category and limited band changes in the M1 category do not help either. 73 David G3YYD Is that simply because Roundup has no single-band categories? In most other cont; /archives//html/RTTY/2014-01/msg00105.html (11,087 bytes)
4. Re: [RTTY] 2Tone AFC (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Tue, 07 Jan 2014 17:19:27 -0500; Chuck 2Tone AFC is a different thinking pattern from using MMTTY. You cannot switch off 2Tone AFC the documentation that comes with tells you that and the reason for it. But N1MM will automatically s; /archives//html/RTTY/2014-01/msg00129.html (8,562 bytes)
5. Re: [RTTY] FREQUENCY IN USE BY ... (JT65/JT9) (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 08 Jan 2014 12:14:00 -0500; The RSGB run a RTTY and PSK 80m contest on a monthly basis. It runs for 2.5 hours in the evenings. To score well both modes need to be used as points are normalised for each mode and then added toget; /archives//html/RTTY/2014-01/msg00180.html (19,604 bytes)
6. Re: [RTTY] Band plan? (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 08 Jan 2014 16:20:58 -0500; You may like to look at the EU band plan as shown by the RSGB here: http://www.rsgbcc.org/hf/ For an individual band scroll down and click on the appropriate band you want to view. 73 David G3YYD ___; /archives//html/RTTY/2014-01/msg00194.html (7,901 bytes)
7. Re: [RTTY] Multi-Single Roundup Rules (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Thu, 09 Jan 2014 05:06:36 -0500; The reason I have been given by other contest organisers for the M1 band change rate limit is to stop people using M2 but claiming M1. Personal view that is disingenuous as I see no difference betwee; /archives//html/RTTY/2014-01/msg00206.html (8,273 bytes)
8. Re: [RTTY] 2tone with Win-test (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 05 Feb 2014 09:59:11 -0500; Alex I designed 2Tone to work with N1MM. Other free to the user logging programs are welcome to adapt their software to use 2Tone. WinTest does not qualify as it is not free to use. 2Tone outperforms; /archives//html/RTTY/2014-02/msg00107.html (7,816 bytes)
9. Re: [RTTY] MMTTY startup tone? (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 26 Feb 2014 05:03:35 -0500; Yes 2Tone and Fldigi use the same start of RTTY transmission. I originated the idea and discussed it with the Fldigi team, who implemented as well. Both 2Tone and Fldigi decoders (and W7AY Mac cocoaM; /archives//html/RTTY/2014-02/msg00313.html (8,886 bytes)
10. Re: [RTTY] 2Tone text window not showing (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 26 Feb 2014 05:09:30 -0500; Dick 2Tone will always appear in a monitor on start up. But it may be minimised to task bar. It may also be behind another window. I suggest you look at the task bar for the 2Tone icon. There is code; /archives//html/RTTY/2014-02/msg00314.html (8,754 bytes)
11. Re: [RTTY] About N4II's experiment... (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Sat, 15 Mar 2014 07:06:02 -0500; All very interesting but if you really want to measure this stuff then you need to talk to Peter Martinez, G3PLX he has been doing it for years. The best way is to use a chirp signal that is within t; /archives//html/RTTY/2014-03/msg00099.html (11,324 bytes)
12. [RTTY] Improved Pseudo FSK Keying circuit for 2Tone (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Sat, 15 Mar 2014 10:30:24 -0500; The system of transformers, diodes and smoothing capacitors is far from ideal as proposed by the Fldigi team. The system proposed here costs less and has virtually no keying bias at all. It has very; /archives//html/RTTY/2014-03/msg00102.html (9,271 bytes)
13. Re: [RTTY] Why 45.45 baud? (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 16 Apr 2014 05:00:18 -0500; I always thought that the reason 45.45 was used in North America was because that is what the commercial land line used. The machines when sold as surplus were then used for amateur radio RTTY. QED 4; /archives//html/RTTY/2014-04/msg00117.html (10,138 bytes)
14. [RTTY] pseudo FSK circuit Tester wanted (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Sun, 27 Apr 2014 09:07:03 -0500; I have worked out a simple circuit that accurately converts 2Tone pseudo FSK into a keying signal. It uses a LP2950 5v regulator fed from a 7 to 15v supply, 74HC123 (dual retriggable monostable), two; /archives//html/RTTY/2014-04/msg00403.html (8,319 bytes)
15. [RTTY] 2Tone pFSK Keying Circuit (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Mon, 12 May 2014 08:26:21 -0500; I have added a file to the N1MM Digital file areas. This file documents a hardware keying circuit that will take 2Tone pseudo FSK output and turn it into a signal suitable for keying a radio's FSK in; /archives//html/RTTY/2014-05/msg00062.html (6,766 bytes)
16. Re: [RTTY] Question (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Sat, 17 May 2014 17:13:30 -0500; Fred If you want to know more about RTTY then have a look at Chen W7AY web site and in particular this bit of his website http://www.w7ay.net/site/Technical/RTTY%20Transmit%20Filters/index.html Also; /archives//html/RTTY/2014-05/msg00114.html (10,626 bytes)
17. Re: [RTTY] Goodbye fellows (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Tue, 10 Jun 2014 17:24:51 -0500; I agree the FCC/ARRL/RM whatever is getting very boring. Please set up your own reflector for this stuff and lets us keep this group for RTTY rather than US political matters. If it carries on much l; /archives//html/RTTY/2014-06/msg00132.html (8,190 bytes)
18. Re: [RTTY] fldigi vs the others (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Tue, 10 Jun 2014 17:37:28 -0500; Bill I have tested 2Tone against MMTTY during its development. I used PathSim, ITU-R propagation models and VE3NEA's RTTY compare software. The difference especially using the ITU-R Poor model is sta; /archives//html/RTTY/2014-06/msg00134.html (8,381 bytes)
19. Re: [RTTY] fldigi & 2Tone AFSK (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 11 Jun 2014 03:11:58 -0500; Salvo You have noticed the difference with Fldigi transmit. It uses differential on/off keying (DOOK). That is it generates two tones and filters the individual tones so they are both narrow in bandw; /archives//html/RTTY/2014-06/msg00150.html (12,466 bytes)
20. Re: [RTTY] sound card (score: 1): Author: "David G3YYD" <g3yyd@btinternet.com>; Date: Wed, 11 Jun 2014 15:06:44 -0500; Peter First do not buy a very cheap one. You get what you pay for. The performance will be substandard. I tried a Ł5 one to see what it was like and I could see spurious generated by the sound card a; /archives//html/RTTY/2014-06/msg00162.html (8,379 bytes)

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