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What is this HF comm mode?

by oneamp
Tags: comm, mode
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davenn
#19
Dec24-13, 02:03 AM
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hey oneamp

The JT 9, 65 etc mode that turtlemeister commented on sounds like the one you have heard
As I commented earlier, Im not on HF much these days
It may not be a beacon, I dont know if there are digital beacons ? It may just be some hams doing the digital mode thing

I did ask, are you a licenced amateur also ?

Dave
oneamp
#20
Dec24-13, 03:58 PM
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Yes I'm licensed but I never use it. Thank you for the information.
Baluncore
#21
Dec25-13, 12:39 AM
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That sounds much like a data mode called “Piccolo”. Piccolo was widely used on HF for diplomatic links back in the 1970's. The bit rate in your recording is about 25% of the original data rate. IIRC the number of different notes used by Piccolo systems was either 16 or 32 depending on the version, which transferred 4 or 5 bits per tone. How many notes show up in the new beacon ?
http://en.wikipedia.org/wiki/Multipl...y-shift_keying
sophiecentaur
#22
Dec25-13, 10:30 AM
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Alan Turing RIP ????
Go and sort it out chaps. If you can.
Think of it as a Christmas puzzle.
I'll bet it's a lot easier than Enigma.
oneamp
#23
Dec25-13, 06:28 PM
P: 222
Thanks Baluncore.


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