[time-nuts] Portable standard

[Joseph Gray]

As usual, lots of good replies and more links to things for me to read :-)

On the topic of rubidiums, I see three different brands on ebay. The
FE units sell for much more. What are the differences between the
three brands? Is the FE brand worth the price? Considering that these
are all used units, how long before the rubidium lamp is  dead? What
about powering these things? Any precautions?

Joe Gray
W5JG