[time-nuts] Valpey-Fisher VFT22H OCXO Output

Chuck Harris cfharris at erols.com
Sat Jan 30 08:20:17 EST 2016


Looks like the output of a simple single ended emitter follower
that isn't being loaded properly.

Try again, but this time with a 50 ohms load.

-Chuck Harris

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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