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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Coherent BPSK on LF using EbNaut |
| From: | Paul Nicholson <[email protected]> |
| Date: | Sun, 18 Oct 2015 19:18:56 +0000 |
| In-reply-to: | <CAA8k23T5Q+gnuPUZ=0ow-WKXomPbpzGYVNSx0Oqi1+iEXfLi=A@mail.gmail.com> |
| References: | <[email protected]> <[email protected]> <CAA8k23T5Q+gnuPUZ=0ow-WKXomPbpzGYVNSx0Oqi1+iEXfLi=A@mail.gmail.com> |
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| Sender: | [email protected] |
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Spent some time today cobbling together a receiver for 137 kHz. System noise measures about 4nV/m equivalent field strength in 1Hz with a BF245B front end but I've not yet attached it to an antenna - that's usually when the trouble starts. The mono audio input of the BT878 video card timestamps fairly well while sampling at 448k samples/second. It's a bit noisy: 3.5 uV RMS in 1Hz at the line input, which means I needed to build in quite a bit of rx gain to overcome the card floor. Because it's a mono audio input I have to mix the GPS PPS and the LF, then separate them again in software. Hopefully soon then, some phase measurements at LF. -- Paul Nicholson -- |
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