[time-nuts] the care and feeding of LPRO's

Bob Camp lists at rtty.us
Fri Oct 7 12:24:50 EDT 2011


The basic answer is:

1) Power them off of something stable around 18 to 19 volts. Anything higher
just heats them up without doing anything useful.
2) Put a heat sink on them. You want to get the base plate to below 50C.
Without a heat sink they get warm enough to significantly shorten their
life. You can indeed get fancy and control the heat sink temperature. 

They are sensitive to magnetic field, barometric temperature, and humidity
as well as voltage and temperature. Keeping them on tends to help with


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Eric Garner
Sent: Friday, October 07, 2011 11:24 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] the care and feeding of LPRO's

Up to this point in my Nuttery I've been messing around with various
GPSDOs. I just bought an LPRO off of Ebay. It hasn't arrived yet but I
wanted to start getting it ready to hookup and play with. I have
several questions that I couldn't find answers to in the archives.

1. has any work been done on optimal power supply design to run these
beasties? I'm initially going to run it off of my (very quiet) bench
supply but long term I would like to put it in a nice box with it's
own supply. how much does power supply noise affect long term
2. what sort of thermal tricks can I do to optimize performance (keep
away from drafts or add thermal mass)
3. any other tricks?


Eric Garner

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