[time-nuts] Muffin Fan and Rb Oscillator

Richard W. Solomon w1ksz at earthlink.net
Sun Jul 17 20:42:41 UTC 2011


Given the heat this thing puts out, I think I need to cool it if I enclose it. 
Hopefully a small DC Muffin Fan will do. My plan is to construct a portable 
reference, not a lab standard.

Thanks for the replies, 

73, Dick, W1KSZ


-----Original Message-----
>From: Mark Spencer <mspencer12345 at yahoo.ca>
>Sent: Jul 17, 2011 1:07 PM
>To: w1ksz at earthlink.net, time-nuts at febo.com
>Subject: Re: [time-nuts] Muffin Fan and Rb Oscillator
>
>I've done something similar to this.  In my case the Rb out performs the 100 second adev and re trace specs from the manufacturer with the fan running.  I can't measure phase noise and I only use the rb to occasionally use as a reference for checking the frequency of an oxco over a time span of an hour or so.  
>
>I did notice that the current drain of the rb is slightly higher with the fan running  and probably more stable than before.  I suspect the heater in the rb  is working a bit harder than before and I may be over cooling the unit.  This might be something to look at if you cool your rb with a fan.





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