Hello,
I've mounted both my LPRO-101 and FE-5680 in Hammond 1590-type cast
aluminum boxes, bolting the rubidium unit to the lid of said box, and
found the heat sinking of the entire arrangement to be entirely
adequate. In each case there is a (well filtered!) switching regulator
present that contributes little to the overall thermal load as well as
allowing them to run directly from a standard "12 volt" equipment bus.
If you run the units at their minimum allowed voltage (19 volts for the
LPRO-101, 15 volts for the FE-5680, IIRC) they will dissipate much less
power as the regulators contained therein are linear type. It struck me
that at the lower limit voltages that they take slightly longer to warm
up and come online, but still somewhere around the 3 minute mark for a
"Physics Lock."
Details may be found at:
http://www.ka7oei.com/10meg_rubidium1.html - For the LPRO
http://www.ka7oei.com/10_MHz_Rubidium_FE-5680A.html - For the '5680, of
course!
73,
Clint
KA7OEI
On 16 December 2014 at 12:16, Bob Camp<kb...@n1k.org> wrote:
Hi
One fairly important issue - the unit needs to be on a heat sink. If you
run it without cooling of some sort, it will not run for very many years.
Bob
I do realize that, but how big? Normally "the bigger the better" is
not an unreasonable rule on heatsinks, but I have heard that cooling
these too much is bad. I have here a heatsink about 600 x 300 x 150
mm, although I think that is a bit OTT !!
Dave
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