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Re: [Discuss-gnuradio] PSK31 dynamic TX flow

From: John Malsbury
Subject: Re: [Discuss-gnuradio] PSK31 dynamic TX flow
Date: Fri, 25 Oct 2013 12:05:54 -0700


You can use a socket-to-pdu block, and write an external python application to send repeating data or pass along key strokes through the socket.  Use a Pdu-to-tagged-stream to convert to a stream of bytes that in turn stimulated the modulator blocks.  That'll make integration and customization a little easier than starting with a new, custom block. 



On Fri, Oct 25, 2013 at 11:52 AM, Louis Brown <address@hidden> wrote:
I'm experimenting with PSK31 transmission.  I can transmit bits streamed from a file, but to take it to the next level, I need to dynamically switch between keyboard keystroke generated data and a repetitive 1010 without stopping the flow.

Is there a way in GRC (or the main GR python script) to dynamically select between a signal source and a file source, using the signal source when the file source is empty?  The file source would be a FIFO that I would fill with an external python script that translates keyboard strokes into a varicoded bit stream.  When that FIFO is empty I need to switch back to the alternating 1010.  I'd rather not source the 1010 from the FIFO since that may lead to timing issues.

I'm trying to avoid, in the short term, writing a custom GR source block, but that may be inevitable.  I read there is a way to probe data in the flow; is there a way to stuff bits into a stream?


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