[time-nuts] Morion MV89A Repair

Tom Knox actast at hotmail.com
Sun Feb 26 17:41:15 UTC 2012


Is this the paper you are speaking of?
Google:  Optimization of Drive-Level in High Stability Low-Noise OCXOs

Thomas Knox



> From: lists at rtty.us
> Date: Sun, 26 Feb 2012 11:20:16 -0500
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Morion MV89A Repair
> 
> Hi
> 
> The paper mentions HC-40 crystals. They probably have the crystal drive current cranked down to optimize short term stability at 1 sec and longer. The phase noise floor takes a back seat.
> 
> The other interesting thing in the paper is that the short term numbers shown aren't into parts in the 13th.
> 
> Bob
> 
> 
> 
> On Feb 25, 2012, at 9:11 PM, "John Miles" <jmiles at pop.net> wrote:
> 
> >> Are the specs at 5 MHz or at 10? They should be 6 db worse at 10 than at
> > 5.
> > 
> > Now that I'm looking back at the data sheet posted with the auction, they
> > were indeed specified at 5 MHz.  But even after the 6 dB penalty, their spec
> > limits versus their real-world numbers are pretty marginal.
> > 
> > Morion actually announced this particular oscillator at IFCS 2002, so
> > there's a paper of sorts:
> > http://www.ke5fx.com/Morion_MV89A_IEEE_IFCS_2002.pdf .  Figure 4 was taken
> > from a 10 MHz part, but all three of the ones I've tested look like the
> > attached.  Same as figure 4 until about 200 Hz... then they never go any
> > lower.
> > 
> > -- john
> > 
> > <mv89a_pn.png>
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