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Messages - turbocode

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1
I have seen this once before but this band is usually empty for me.

Any idea what this is?

https://imgur.com/a/NK8cFPT

2
HF Mystery Signals / 50m ISM Band, what is this?
« on: May 25, 2022, 0233 UTC »
Seen east coast in USA at 10:30pm EST.  I really havent a clue nor have had time to open it in matlab.

Any ideas?  Could it be OFDM? but from what?

Link to waterfall....
https://imgur.com/a/6Oew5H7

3
Utility / reading of nato alphabet and numbers
« on: February 01, 2021, 2116 UTC »
8.992 MHz.  Lots of echo I am presuming from ionospheric ducting.

English words reading letters and numbers.

21.15 zulu.

Mid atlantic usa.

4
I see the following list of signals on my SDRs over the last few months but I cant identify them.  Can anyone help?
1. 6.486 mhz - I think it is rtty 75w but i cant decode it.
2. 6.385 and 6.423 mhz.  These look like some kind of OFDM. 

I have scoured the internet for these frequencies but I havent been able to turn up any leads.

5
central PA, i have him fine on DSB.

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