12, 2013 02:25 73 WG2XRS de DL-SWL Op65 -43 dB F:9% in nr
locator’s JO52HP and FN12LP 6246.44 km
bowled a googly that night, right in at the system limit , ook
65 mins data , -43 db ,
decodes +20 db up.
Sent: Wednesday, November 25, 2015 9:32 PM
Subject: Re: LF: EbNaut and The Cat / Take 3
Its a pity we no longer have 73kHz
Back in the early 1990's when that band was being proposed, one of the
ideas put forward as an argument for getting it was a link budget worked
out showing how TA might be just about possible using coherent PSK with low
symbol rates - something that would have been very difficult for amateurs in
those early days of DSP.
The TA path was managed eventually once, or perhaps twice AFAIR, by
very slow QRSS at high power and, I think, a period of enhanced propagation.
Suspect it would be easy enough on EbNaut now.
The PIC 1kHz bandpass digitiser is a very neat way of doing the back end of
an LF narrowband SDR, allowing embedded GSP timestamp and completely independent
of all the nasties associated with soundcards