[time-nuts] need recomendation for a portable 10mhz reference oscilator

[Eric Fort]

I'm looking for a fairly basic, relatively simple 10 Mhz PORTABLE
reference (probably quartz based) with enough stability over a period
of a week of outdoor temp extremes to keep a 47Ghz transmitter locked
within 100hz  while mountaintop contesting.  Suggestions are
appreciated.  something that is small and ran off 12 volts dc (car
battery) would be a definite plus.

Thanks,

Eric