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Re: [Discuss-gnuradio] PSK File transfer
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From: |
Martin Braun |
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Subject: |
Re: [Discuss-gnuradio] PSK File transfer |
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Date: |
Wed, 26 Mar 2014 10:45:11 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 03/26/2014 08:32 AM, Stephen Andrew wrote:
> Hello,
>
> I'm trying to do a simple file transfer over PSK, but the text file I
> get on the output is garbled. I've got:
>
> file source -> throttle -> psk(4) mod -> psk(4) demod -> pack K (8) bits
> -> file sink
>
> If I put in a file sink before the modulator, I see the message just fine.
Do you mean if you put a file sink before the modulator, you get the
correct message in the file sink after the packer?
PSK Demod is a complete demod chain, it estimates freq. offset, timing
etc. It's probably not converging immediately, and then your signal is
bit-shifted.
M