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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>For my Philips PM6673 (120 MHz frequency counter) there is an optional ‘precise’ 10 MHz reference OCXO with part # PM9691 that can be easily installed. I know this because it is listed in the PM6673 manual that I am reading as an available option; and the manual shows how to install it (certainly it would be better than the basic XTAL reference oscillator in there now). <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>Now, I have noticed there also exists out there an optional ‘ultra precise’ 10 MHz OCXO with part # PM9692. But I can’t quite tell if it would fit into my PM6673 in exactly the same way as the aforementioned PM9691 (i.e., with the same mounting screws, and using the same voltages to run it, same form factor, same wiring, etc.). I can’t tell for sure because I don’t see that one listed as an optional OCXO in any PM6673 manuals that I have come across.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>It could be that I simply have a manual for the PM6673 that is not quite the most recent – and that while the ‘ultra precise’ PM9692 OCXO is not listed in *that* manual, it may indeed be shown as a listed option in a more recent manual. I don’t know.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>It could also be that the ‘ultra precise’ PM9692 OCXO is indeed a direct replacement for the (less) ‘precise’ PM9691 OCXO, and so fits nicely into my PM6673, but that this became available as an option after the most recent PM6673 manual had been printed, and so is not listed as an option in *any* of the PM6673 manuals – even though it is. I don’t know.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>Does anyone know for sure if the ‘ultra precise’ optional PM9692 OCXO can be installed exactly the same as the (less) ‘precise’ optional PM9691 OCXO in my PM6673? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif"'>--- Rob Myers, VE3JQL<o:p></o:p></span></p></div></body></html>