10Mhz OCXO Sine to Square

[Bryan]

I just got my Morion MV89a yesterday, I will just add a OPAMP LM7171, it will not create a square but I don't think you need it to use it for other instruments to use as a reference.

eurofox

Do you know what the output amplitude of the Mv89a is. Specs say ~7dbm

[dannyf]

Do you know what the output amplitude of the Mv89a is.

More than 1Vpk.

A guess on my part,

[Bryan]

I was thinking since 7dbm is around 5mw and using ohms law with a 50 ohm output around .25v, but that is just a wild guess and probably wrong.

[KJDS]

0dBm in 50 ohms is 224mV rms.

+6dBm will be double that voltage, so +7dBm will be a fraction more, so about 0.5V rms and ~1.5V p-k. Not enough to drive the average logic gate.

[hli]

The recommended way seems to be using an inverter gate: http://www.pletronics.com/ple/articles/view/401. I used this very circuit recently, but added a DFF divider after the inverter to get a signal with proper 50% duty cycle (my assumption is that the inverter has at least a stable point where it switches).

[Bryan]

The recommended way seems to be using an inverter gate: http://www.pletronics.com/ple/articles/view/401. I used this very circuit recently, but added a DFF divider after the inverter to get a signal with proper 50% duty cycle (my assumption is that the inverter has at least a stable point where it switches).

Look like a neat solution, only thing is the specs call for a peak to peak of 0.8v. Should be ok according to what KJDS posted

[dannyf]

0dBm in 50 ohms

Do we know that it is referenced to a 50ohm load?

[dannyf]

using an inverter gate: http://www.pletronics.com/ple/articles/view/401.

That's a self-biased gate ac coupled to the oscillator.