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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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

 

From: Paul Heller <[email protected]>
Sent: Saturday, February 4, 2023 7:58 PM
To: W2HX <[email protected]>
Cc: Daniel Jones <[email protected]>; Greenkeys <[email protected]>
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
ITTY100:               HTTP://INTERNET-TTY.NET:8010/ITTY100



On Feb 4, 2023, at 5:53 PM, W2HX <[email protected]> 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

 

From: Daniel Jones <[email protected]>
Sent: Saturday, February 4, 2023 7:46 PM
To: W2HX <[email protected]>
Cc: Greenkeys <[email protected]>
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 




On Feb 4, 2023, at 16:34, W2HX <[email protected]> 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

 

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>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
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