Any possibility of using the decoded signal to un-do the modulation and
feed the reconstituted signal to the older receiver?
On 7/8/2012 12:56 PM, paul wrote:
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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