[time-nuts] Valpey-Fisher VFT22H OCXO Output

wb6bnq wb6bnq at cox.net
Sat Jan 30 05:26:00 EST 2016


Hi Logan,

My guess is there is some second or third harmonic energy present.  I 
have observed the very same thing on another oscillator.  Look at it 
with a spectrum analyzer and see what kind of harmonic energy is there.

Bill....WB6BNQ


Logan Cummings wrote:

>Hi All,
>
>     Curious what could give this waveform (attached) - I presume this is
>not correct output for this oscillator (surplus/salvage from Harris
>Constellation receiver).
>
>     Frequency looks OK with +2V EFC but output looks like neither sine nor
>any CMOS I've seen into 10Mohm (first capture, scope probe alone) or 50ohm
>(50ohm term at SMA connector, probed by same scope probe) .
>
>     What gives? If I open up the can, what am I looking to possibly
>replace/eliminate? How to open it? It's soldered shut (2x2in case).
>
>     I need a good low-noise 100MHz sine wave for my application so I'm
>tempted to open this guy up and replace the output circuitry with something
>more suitable.
>
>    Thanks in advance for any pointers/info on these units!
>-Logan
>  
>
>
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