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Mixer (R5) circuitry attached. http://files.engineering.com/getfile.aspx?folder=d7495d01-8375-4055-83f6-955867bc814a&file=IMAG0815a.jpg

Q13 is p/n NE85630-T1, if that helps. IC5 is a mixer p/n ADE 2ASK (another component I'm not familiar with) More and more, I'm doubting what the manufacturer says about this being an oscillator. MacGyverS2000 - There are 6 revisions of these units. The oldest dates back 15+ years. The newest...

Then we're at an impasse. We've used this schematic for years. It's been traced and retraced, corrected - with the exception of the E, B, C pin-outs. It is what it is. All I'm seeing on these forums is the same thing the EEs who've looked at this board in person have said - it doesn't make...

I think it may be an OCXC. There is a heating/cooling system built into this circuit that affects 80% of the PCB. The oscillator's frequency comes up to 200MHz as the board heats up, then stays as the temperature is regulated to remain at a certain point. Any thoughts?

Attached is a picture of the PCB where the crystal sits.http://files.engineering.com/getfile.aspx?folder=7f1c56ff-c38b-4554-b2a3-fd34118b0b64&file=IMAG0813.jpg

Attached is the oscillator circuit schematichttp://files.engineering.com/getfile.aspx?folder=bdcb613d-b642-4a22-b99f-c27d856e7197&file=IMAG0814.jpg

Trust me, 9 pins go directly to ground. I've been working with (and scratching my head over) these for several years.

I have an obsolete, proprietary crystal oscillator. It is a 200MHz, 10 pin, SMT component. The number on the unit is 200N1. I cannot find another C.O. like it in size, number of pins or footprint. What I don't understand is 9 of the pins are grounded. Only one pin is used and it obviously puts...