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AW: Re: LF: 8270Hz-PHASE

To: [email protected]
Subject: AW: Re: LF: 8270Hz-PHASE
From: [email protected]
Date: Tue, 15 Mar 2016 18:55:23 +0100
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this is what leaves the antenna,
pse see the attachment

Von: Paul Nicholson <[email protected]>
Gesendet: 14.03.2016 20:10
An: <[email protected]>
Betreff: Re: LF: 8270Hz

Uwe wrote:

> can I get somehow your 8270Hz .WAV file from today

I made three WAV files suitable for input to ebnaut-rx
(the header contains frequency and time info). All
files begin 02:59:00 and decode with a start offset
of 60.00

Various sample rates and file sizes:

30 samples/sec 2.8 Mbyte Eb/N0 = 1.0 dB

10 samples/sec 936 Kbyte Eb/N0 = 0.6 dB

1 samples/sec 96 Kbyte Eb/N0 = 0.4dB

I notice that the error rate increases a little as I reduce the
bandwidth. Here I usually decode from a rate 240 samples/sec
and got Eb/N0 = 1.2 dB but it's down to 0.4 dB after resampling
to the lowest rate. I'm not sure why that is.

> the carrier is on.

Amplitude and phase plotted in 5 minute steps

Some pretty wild variations of phase but it
settles down from about 02:00 onwards. I tried
to decode the earlier carrier as an 'all-star' message,
but without success at symbol length 10 seconds.

Paul Nicholson

Attachment: phase 15.03.16.png
Description: phase 15.03.16.png

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