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New to non-morse and lost (1 reply and 4 comments)

ianf
1 month ago
ianf 1 month ago

Hi All, I'm new to the Ham world, although not new to morse.

I'm currently playing with FLDIGI and my SDR (RSP1A), trying to demod various signal types. My problem is getting an id on the transmission type so that I can set up the demod program. 

I've wandered around several wikis and found a lot of useful info, but not the info I'm currently looking for. I've attached a short video of the particular transmission and would be grateful for any pointers to what it is or might be.  Freq is 14074Khz.

ianf
1 month ago
ianf 1 month ago

Tried to give audio via MP4 but not allowed.

https://www.essexham.co.uk/images/unident2.jpeg
George M0URB
1 month ago

14074 kHz is the frequency used by FT8. In your screenshot you can see lots of different FT8 signals next to each other, and the two second gap between the transmissions.

ianf
1 month ago

Thanks, George. Still a bit confused though as all those transmissions are simultaneous - the gap is one transmission ceasing followed by the answering station on a slightly different freq. Almost as if they are using some kind of FDM?

ianf
1 month ago

Ah, just discovered that FT8 is MFSK - so each txmn has multiple adjacent freqs. Makes sense now, thanks, George.

Peter M0PWX (2E0PWX)
1 month ago

hi IanF

FT8, FT4, WSPR and several others are decoded by WSJT-x
have a look on my QSL.net page for more https://www.qsl.net/m0pwx/modes-and-freq.htm

the other useful page is https://www.sigidwiki.com/wiki/Category:Amateur_Radio you have waterfall images and many have sound files as well to help ID

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