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Author Topic: Marine / Fixed RTTY -- Standards?  (Read 689 times)
VA7CPC
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Posts: 2357




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« on: January 24, 2004, 03:21:59 PM »

I sometimes hear RTTY signals on the marine bands and "fixed service" bands.   But I can't decode them -- no combination of baud rate and mark/space shift, and "normal/reverse" gives me meaningful text using MMTTY.

Are there any standards?   Are they encrypted?

Thanks.
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AA4PB
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Posts: 12672




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« Reply #1 on: January 25, 2004, 12:16:17 AM »

Most of them are encrypted.
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K0HZI
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Posts: 470




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« Reply #2 on: January 25, 2004, 10:09:32 PM »

If you could decode them, the messages would be pretty uninteresting stuff, almost like monitoring taxi cab calls on your two meter rig if it has extended receive.

Where are the UPI and AP these days?  Those two were above the twenty meter ham bands back in the 60's.  Gave the old Teletype Model 15's and 28's a good work out, ate up a lot of paper too ;-)
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K7CMA
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Posts: 4




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« Reply #3 on: June 22, 2004, 06:24:41 PM »

I doubt they are encrypted (at least on the marine bands).

They are most likely SITOR systems.  If you Google "SITOR" you will find websites with the information you are seeking regarding baud rate, shift, etc.
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