Re: LF: Coherent BPSK on LF using EbNaut

[John Andrews <w1tag@charter.net>]

> Some years ago I proposed GPS / UTC seconds locked coherent signalling
> on LF, but didn't have the expertise to write the software - and
> certainly not to implement strong FEC !
> Andy  G4JNT
Somewhere around February, 2004, Bill de Carle, VE2IQ, came out with a 
version of AFRICAM that implemented GPS-synched BPSK. A number of us 
played with it in the 160-190 kHz U.S. "Lowfer" band. The GPS sync 
greatly reduced the lock-in time at the decoder end, and was quite 
effective. When the first of the U.S. experimental stations arrived on 
2200 meters later that year, we tried it down there, again with good 
results among a small group of listeners. Given the small target 
audience, we all moved on other things.
Anyway, just to note for historical purposes that some of this has been 
done before!
John, W1TAG