at 22:40 UTC, 10.715 MHZ, AM, YL with numbers and digital bursts in Spanish.
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So perhaps the data sequences are simply echoing the voice transmissions. I once tried copying out those number groups to see if any of them were repeated, but that was before the data streams were added, and there were more of the groups. I did manage to see entire sequences repeated.It's very likely RDFT, which is a mode associated exclusively to HM01. There is an app that supposedly decodes it, but from what I have heard, it's a bit dodgy and it's stability is not all that good. Even if you decode it, it's all letters and numbers, much like what the Russians (and others) do. A quick search of the UDXF logs confirms the guess.
It's very likely RDFT, which is a mode associated exclusively to HM01. There is an app that supposedly decodes it, but from what I have heard, it's a bit dodgy and it's stability is not all that good. Even if you decode it, it's all letters and numbers, much like what the Russians (and others) do. A quick search of the UDXF logs confirms the guess.
Interesting! Thanks for the link. The only number stations I've heard over the last few years were the Cuban ones in Spanish. The first time I heard ham JT65 transmissions I didn't know what they were. At first I thought they were some kind of spy activity, until I finally installed the software to decode them. When I then ran across FT8 as well, I knew what to expect.
Yes, that wiki, and some posts, are what helped me identify JT65 and FT8. I have MultiPSK and have decoded ham RTTY and CW as well, but I hear the other amateur modes so seldom that I'm never ready to decode them. By the time MultiPSK comes up on my screen, the stations have gone off the air, or at least faded into oblivion. On the other hand, I pick up maritime navtex and fax signals far more often, and they're easy to decode.We have another forum for discussing ham digital modes, but there are a number of such modes hams use, and more being experimented upon. We have a wiki page that introduces many of these modes here...
HF Digital Amateur Radio - The RadioReference Wiki