To: | [email protected] |
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Subject: | Re: LF: EbNaut LF test from iz7slz |
From: | Paul Nicholson <[email protected]> |
Date: | Thu, 19 Nov 2015 19:12:03 +0000 |
In-reply-to: | <[email protected]> |
References: | <CAA8k23QT5eM1XbeXb7nSv8T=kmmwVppAxhVFb0=ejtF4wzQkww@mail.gmail.com> <[email protected]> <[email protected]> <[email protected]> |
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I'm looking at the 30 minute carrier and there's obviously a problem http://abelian.org/vlf/tmp/151119c.gif The main peak is off frequency and it's jumping around a lot. Could be a problem with my timing system. It's reporting a max error of around 40nS which is only a degree or two. I'll go check what MSF 60kHz and BBC 198 kHz look like. Best decode of the 18:00 messages was with timing offset +60 mS which gave Eb/N0 +2.1dB which is about 5dB worse than it should be given the carrier strength. -- Paul Nicholson -- |
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