[time-nuts] Mounting Suggestions for Morion MV89A
engineering at mt.net
Fri May 17 20:23:00 EDT 2013
I occasionally have the same issue when receiving microwave counters that (for some strange reason) are equipped with poor TCXOs and need to install an OCXO. To solve this problem, I found a source of bare FR4 glass epoxy board stock:
They offer pre-cut standard size smaller panels of different thicknesses but, unfortunately have a minimum order. Given my work, I usually place an order for several different sizes and thicknesses.
In addition to this, I then purchase PCB receptacles from Mouser Electronics to allow easy removal of the oscillators if required:
Drill a few holes, press in the sockets, wire them up point-to-point and you have a convenient mounting method. The above pages also show turret type terminals which you can also use to mount external discrete components if necessary. In all it makes for a very neat retrofit.
If your application is portable, fabricate a small hold down clamp to keep the oscillator in its socket during transit and vibration.
Otherwise one could obtain a FR4 board with pre-etched isolated pads providing the component has standard pin spacing and arrangement but then you have a "Swiss cheese" appearance to your project.
On Fri, 17 May 2013 13:19:05 -0700, Frederick Bray write:
>I just received my first Morion MV89A. It came attached to a piece of
>the original PC board.
>I wonder how others have mounted theirs. One option seems to be to get
>a piece perf board (perhaps with solder pads). Another might be to
>leave it on the original PC board since that seems to have a nice ground
>plane and enough of the board remaining around the edges to mount the
>whole thing on stand-offs. I could remove the dozen or so capacitors
>and resistors on the original board.
>I am thinking of using at least one of these in an existing piece of
>equipment, so something simple is desirable.
>Thanks for any suggestions.
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