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Re: [time-nuts] Mounting Suggestions for Morion MV89A

GM
Gregory Muir
Sat, May 18, 2013 12:23 AM

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:

http://accurateplastics.thomasnet.com/viewitems/epoxyglas-g10-fr4--mil-i-24768-27--nema-fr4/epoxyglas-sup-tm-sup-g10-fr4-panel

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:

http://www.mouser.com/catalog/catalogusd/646/1748.pdf
http://www.mouser.com/catalog/catalogusd/646/1751.pdf

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.

Greg

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.

Fred Bray

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: http://accurateplastics.thomasnet.com/viewitems/epoxyglas-g10-fr4--mil-i-24768-27--nema-fr4/epoxyglas-sup-tm-sup-g10-fr4-panel 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: http://www.mouser.com/catalog/catalogusd/646/1748.pdf http://www.mouser.com/catalog/catalogusd/646/1751.pdf 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. Greg 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. >Fred Bray