[GreenKeys] ITTY 850 shift?

Sun Feb 5 09:43:56 EST 2023

I just did a little experiment and ran the feeds simultaneously (the ITTY feed and an audio feed using the RTTYApp set at 1575/2425) I couldn’t get my machines to decode either one being piped through the same line.  Definitely a bit more experimenting needed but good fun all around.

Daniel

> On Feb 5, 2023, at 6:16 AM, Nick England <navy.radio at gmail.com> wrote:
> 
> Arrgh! Yep, in the mid-1960’s, the USN switched from 2550 center to 2000 center, perhaps because of migration from FSK to SSB AFSK with the high end rolloff issue.  
> 
> I don’t think anyone is actually using 850 shift these days except us military RATT net guys, and we all have 2000 center equipment.
> 
> Sounds like the only thing to do is to stream all possible tone pairs!
> 
> Nick K4NYW 
> 
> On Sun, Feb 5, 2023 at 8:20 AM Alf Fisher <alffisher2 at gmail.com <mailto:alffisher2 at gmail.com>> wrote:
> Having said that Nick, the centre frequency of a Navy Department Bureau of Ships CV-89A in wide shift is 2550 c/s which with ± 425 shift makes the tone frequencies 2125 c/s and  2975 c/s.
> 
> That's the great thing about standards, there are so many to choose from!
> 
> I've got a CV-89A in the museum that I would love to be able to use but the discriminator frequencies don't fit with present day tone frequencies.
> 
> 73,
> Alf
> G3WSD
> 
> 
> 
> 
> On 05/02/2023 01:52, Nick England wrote:
> 
>> Paul, definitely use these military tones and not the ham ones that Jim Haynes discussed. No one is running 850 shift any more except us guys running military gear. Our equipment is not retunable to the ham tones. 
>> Thanks
>> Nick
>> 
>> 
>> On Sat, Feb 4, 2023 at 8:29 PM W2HX <w2hx at w2hx.com <mailto:w2hx at w2hx.com>> wrote:
>> That would be cool! Center freq 2000 Hz, shift is +/- 425 Hz so that means the tones are 1,575 Hz and 2,425 Hz. Mark is low. Someone correct me if I’m wrong.
>> 
>>  
>>  
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos <https://www.youtube.com/@w2hx/videos>
>>  
>> From: Paul Heller <paul0926 at comcast.net <mailto:paul0926 at comcast.net>> 
>> Sent: Saturday, February 4, 2023 7:58 PM
>> To: W2HX <w2hx at w2hx.com <mailto:w2hx at w2hx.com>>
>> Cc: Daniel Jones <djones at k6yic.com <mailto:djones at k6yic.com>>; Greenkeys <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>>
>> Subject: Re: [GreenKeys] ITTY 850 shift?
>> 
>>  
>> Let me see what I can do. What are the frequencies for 850 shift, mark and space? 
>> 
>>  
>> Paul
>> W2TTY
>> 
>> ITTY:                      HTTP://INTERNET-TTY.NET:8000/ITTY <http://internet-tty.net:8000/ITTY>
>> ITTY100:               HTTP://INTERNET-TTY.NET:8010/ITTY100 <http://internet-tty.net:8040/EUROPE>
>> 
>> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART <http://internet-tty.net:8030/AUTOSTART>
>> EUROPE:              HTTP://INTERNET-TTY.NET:8040/EUROPE <http://internet-tty.net:8040/EUROPE>
>> 
>> 
>> On Feb 4, 2023, at 5:53 PM, W2HX <w2hx at w2hx.com <mailto:w2hx at w2hx.com>> wrote:
>> 
>> 
>> 
>> Thanks, Dan. I can generate the tones ok. I was just hoping that I could get some news stores to print. It would be great if the ITTY powers that be could just pipe the same data to both a 170 Hz shift and an 850 Hz shift audio stream. Dunno what is involved with that but just curious.
>> 
>>  
>>  
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos <https://www.youtube.com/@w2hx/videos>
>>  
>> From: Daniel Jones <djones at k6yic.com <mailto:djones at k6yic.com>> 
>> Sent: Saturday, February 4, 2023 7:46 PM
>> To: W2HX <w2hx at w2hx.com <mailto:w2hx at w2hx.com>>
>> Cc: Greenkeys <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>>
>> Subject: Re: [GreenKeys] ITTY 850 shift?
>> 
>>  
>> I had a cast set up to broadcast tty over the internet.  Let me look this week and see if it’s still running on my site and the feed something into it at 850 shift.  
>> 
>>  
>> You can also change the settings on the itty software to the required tones to test it in-house.  
>> 
>>  
>> Daniel 
>> 
>> www.K6YIC.com <http://www.k6yic.com/>
>> DJones at K6YIC.com <mailto:DJones at K6YIC.com>
>> HH#11973
>> 
>> 
>> 
>> 
>> 
>> On Feb 4, 2023, at 16:34, W2HX <w2hx at w2hx.com <mailto:w2hx at w2hx.com>> wrote:
>> 
>> 
>> 
>> Anyone know if there is a URL for ITTY for 850 shift?
>> 
>>  
>>  
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos <https://www.youtube.com/@w2hx/videos>
>>  
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>> >>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch <https://teletype.net/gksearch>
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>>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch <https://teletype.net/gksearch>
>>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/ <http://mailman.qth.net/pipermail/greenkeys/>
>>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html <http://mailman.qth.net/archive/greenkeys/greenkeys.html>
>>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html <http://comcents.com/tty/greenkeyssearch.html>
> 
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> >>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch <https://teletype.net/gksearch>
> >>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/ <http://mailman.qth.net/pipermail/greenkeys/>
> >>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html <http://mailman.qth.net/archive/greenkeys/greenkeys.html>
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html <http://comcents.com/tty/greenkeyssearch.html>
> 
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>>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
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