To: | [email protected] |
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Subject: | Re: LF: EbNaut and The Cat / Take 3 |
From: | Andy Talbot <[email protected]> |
Date: | Wed, 25 Nov 2015 21:32:44 +0000 |
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References: | <CAA8k23R+Q-4zD50pXGZ5XMEdM7rnFvp844f_nUAuKMfuAs+2PQ@mail.gmail.com> <[email protected]> <2062584.LhDGbAj14s@zv5000> <[email protected]> |
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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 Andy G4JNT On 25 November 2015 at 20:42, Paul Nicholson <[email protected]> wrote: Markus wrote: |
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