wide band data mode?

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Last seen: 6 months 6 days ago
Joined: 2014/02/22 - 07:59
wide band data mode?

I've noticed the same digimode signals on HF for a few years now and still haven't discovered what they are.
When viewed on a scope display ie multipsk it is quite wideband and shows a constant rippling effect along the wave form. Looks like a mexican wave type of effect.
Can anyone put me out of my misery and tell me what it is?

freqs I see it regularly are 4.233mhz - 4.260mhz - 4.265mhz - 4.278mhz etc etc