What is this HF comm mode?


by oneamp
Tags: comm, mode
davenn
davenn is offline
#19
Dec24-13, 02:03 AM
Sci Advisor
PF Gold
davenn's Avatar
P: 2,241
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
oneamp is online now
#20
Dec24-13, 03:58 PM
P: 185
Yes I'm licensed but I never use it. Thank you for the information.
Baluncore
Baluncore is offline
#21
Dec25-13, 12:39 AM
P: 1,266
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
sophiecentaur is offline
#22
Dec25-13, 10:30 AM
Sci Advisor
PF Gold
sophiecentaur's Avatar
P: 11,341
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
oneamp is online now
#23
Dec25-13, 06:28 PM
P: 185
Thanks Baluncore.


Register to reply

Related Discussions
common mode differential mode signals Electrical Engineering 2
Radiating mode vs Coupled mode leaky cables Electrical Engineering 6
Coupled oscillators - mode and mode co-ordinates Introductory Physics Homework 1
Single Mode to Multi-mode back to Single Mode Electrical Engineering 0
install COMM.DRV Computing & Technology 2