[time-nuts] Phase modulation detection/NIST plan

[Peter Gottlieb]

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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>
>
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