[time-nuts] Rb cooling
EWKehren at aol.com
EWKehren at aol.com
Sun Jul 17 21:03:34 UTC 2011
I use on several Rb's a small 5 X 5 X 1 cm Nidec 60 mA fan with a linear
temp regulator. I can not hear it and it is mounted on the outside back
plate of the chassis with the Rb on the other side of the back plate. In one
case I have the fan mounted with four rubber grommets inserted in the
chassis with screws through their center in an other case I have a Rb vibration
mounted with its back plate with heat sink protruding through the back. It
is amazing how much cooling such a small fan produces and I have not been
able to detect any vibration by attaching a cheep Xtal Osc. to the Rb
assembly.
On my FRS unit which I would call my portable unit that runs off a 12 V
battery the typical fan current is about 37 mA with a 45 C back plate.
Bert Kehren
In a message dated 7/17/2011 2:46:27 P.M. Eastern Daylight Time,
w1ksz at earthlink.net writes:
If I use a Muffin Fan to cool the Rb (both are mounted in the same box,
in close proximity to each other), will the noise and/or vibration affect
the stability of the Rb oscillator ?
Thanks, Dick, W1KSZ
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