Paul,
Yes, that is an Opera signal.
Opera uses on/off keying rather like QRS.
The characters are quite different to normal morse code.
The decoder does the hard work, it decodes & displays.
You don't need to be more than a few Hz away, it is very robust.
The Opera decoder will decode multiple Opera signals around the same
frequency.
On 136 kHz the pass band is centered on 137.500 (+/- 50 Hz).
Here is a screen shot.
https://www.dropbox.com/s/uln9d92qbtrw6t8/Screenshot%202016-03-14%2020.38.35.png?dl=0
More info here at Opera group web site :-
https://groups.yahoo.com/neo/groups/O_P_E_R_A_/info
73, de Gary - G4WGT
MF-LF-VLF Grabber : http://myweb.tiscali.co.uk/wgtaylor/grabber2.html
Web : http://myweb.tiscali.co.uk/wgtaylor/index.html
.
On 14/03/2016 19:15, Paul Nicholson wrote:
Oh, I just looked at your screenshot Gary. So that's what Opera
looks like. I thought it was Morse code, no wonder I couldn't
read it!
It doesn't take up much bandwidth does it? How many Hz away do
I need to be, to not cause interference to Opera? Only a couple
of Hz I guess.
--
Paul Nicholson
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