[eagle] Re: Phase noise

Matt Ettus 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?

Matt



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