[time-nuts] Phase modulation detection/NIST plan

[Bob Camp]

Hi

The gotcha is that they may change the sync word based on test data. They may also tweak other vague points in the spec based on the troubles they run into in their tests or with their silicon. 

Bob

On Jul 8, 2012, at 8:07 PM, Magnus Danielson wrote:

> On 07/09/2012 12:46 AM, paul wrote:
>> 
>> Peter indeed there could be
>> But it should not need to be decoded to undo the psk.
>> Plus documentation lacks some of the details I think to actually do it.
>> But that would be a significant project since the formats not been
>> settled completely yet.
> 
> I have looked at the PTTI 2011 paper (wwvb.pdf) and much of a format is being shown. Has anyone established the 14 bit sync-word and verified the format? It seems that aligning up with the normal AM broadcast should be possible.
> 
> Can someone record it as it has been reduced to say 2 kHz and analyze the produced audio file? Recoding with 48 kHz sampling rate should allow almost trivial 2 kHz I-Q demodulation to illustrate phase swaps.
> 
> Cheers,
> Magnus
> 
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