[time-nuts] Morion MV89A position

Charles Steinmetz csteinmetz at yandex.com
Wed Jan 29 12:27:09 EST 2014


Poul-Henning Kamp wrote:

>Sorry, I had read it as you had the OCXO in close contact with the box.

No, I agree that wouldn't work well.  Isolating the oscillator from 
the cast box is what the teflon or nylon standoffs are for.  As I 
said in response to Paul, I recommend at least 3-4 cm of air space on 
all 6 sides of the oscillator.  If the cast box is mounted in another 
enclosure (whether the second enclosure has a thermostatically 
controlled fan or not), it should be insulated from that box, too 
(so, no direct thermally conducting path from the oscillator to the 
cast box, and no direct thermally conducting path from the cast box 
to any additional enclosure or rack).

Typically, the cast box can just sit in an out-of-the-way place on 
some rubber feet (preferably, not right in front of an HVAC 
vent).  If the environment is brutal with respect to large, fast 
temperature changes, then an outer enclosure and perhaps even a 
thermostatically controlled fan are indicated.

This system has worked extremely well for me, and does not attract 
the same attention as requisitioning 4U rackspace for a cinderblock.

Best regards,

Charles





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