[eagle] Re: Phase noise
matt at ettus.com
Mon Jun 11 09:55:12 PDT 2007
Robert McGwier wrote:
> Thank you all for this great conversation. I want to remind everyone
> that we need long term coherence in the receiver, which can only be
> accomplished by low phase noise, not for the purity of the tone needed
> to be heard by a human ear, but by the need to correlate for long known
> symbols to recover frequency and timing in the SMS text messaging system
> and to do COHERENT detection of the symbols transmitted. We want the
> analog transponder to support this. This is also contributes to the
> requirement for a much larger dynamic range in the system than we have
> had heretofore on our spacecraft.
This will be completely controlled by the master reference oscillator.
Are there specs for this? Is someone designing one?
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