[time-nuts] Choice of Rb vendor

[J. L. Trantham]

My recollection of reading the LPRO-101 Manual is that there is a
requirement for a heat sink for continuous operation to keep the baseplate
less than 70 degrees C.  It is OK to turn it on for 4 or 5 minutes to make
sure it 'locks' but, IIRC, there is a specific specification for a heat sink
with a thermal resistance of less than 2 degrees C/W for ambient
temperatures greater than 50 degrees C and there is a requirement that the
baseplate be kept less than 70 degrees C, with either forced air cooling,
mounting on a base plate or heat sink.

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Murray Greenman
Sent: Wednesday, April 20, 2011 5:02 PM
To: time-nuts at febo.com
Subject: [time-nuts] Choice of Rb vendor


Joe,
If all you need is a fixed 10MHz source, you might be better getting an
Efratom LPRO-101, which are available from the same sources. The LPRO-101
doesn't need a heatsink, and does not have the confusing array of different
versions and options that the FEI units suffer from.

As for suppliers, I have had good results with 'Fluke.1' also known as
'NBBob', and probably other aliases. He is fast and reliable on delivery,
and replaces faulty equipment without argument. I have no experience with
any other suppliers.

Most of these suppliers seem to have little knowledge of what they are
selling, so don't trust the technical details given without checking them
yourself.

73,
Murray ZL1BPU


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