[time-nuts] Phase modulation detection/NIST plan

[paul]

Ei
Sorry if I have your name reversed. By taking this approach it 
eliminates the ability to use wwvb as a frequency reference because it 
destroys that traceability.
Thats what we are trying to preserve. Or at least re-establish for the 
older phase measuring receivers.
Regards
Paul

On 7/8/2012 12:10 PM, Tofurk Ei wrote:
> If the changeover you are talking about is this one:
> http://www.nist.gov/pml/newsletter/radio.cfm as a proof of concept a DVB-T
> dongle/upconverter combo could almost certainly handle PM easily to output
> whatever it encodes, when paired with gnuradio..
>
>   The RTL2832U chip might also be able to handle some low band signals
> directly, using direct sampling. No upconverter.
>
> Regardless, then the data would be fed into gnuradio - the gnuradio
> developers GUI is called "gnuradio companion" It has a nifty way of doing
> this kind of thing, one builds a "flow graph" where the actual demodulation
> is simply laid out graphically and tested.
>
> When everything works to one's satisfaction the file is saved and it gets
> compiled - then it can run - its basically a python script.
>
> If the modulation scheme is public, I think you can be almost certain that
> gnuradio might be quite useful to rapidly design a tool to demodulate it.
> Perhaps very quickly.
>
> For the money, one really couldn't hope to beat the flexibility of this
> combination in any other manner. If I were interested in trying this I
> would join the gnuradio mailing list and ask there. Perhaps the answer is
> surprisingly simple.
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