[time-nuts] Fwd: quartz / liquid nitrogen

[Alexander Pummer]

at low temperatures bipolar devices will have reduced gain

73

KJ6UHN

Alex



-------- Forwarded Message --------
Subject: 	[time-nuts] quartz / liquid nitrogen
Date: 	Mon, 2 Apr 2018 12:46:26 -0700
From: 	Tom Van Baak <tvb at LeapSecond.com>
Reply-To: 	Tom Van Baak <tvb at leapsecond.com>, Discussion of precise time 
and frequency measurement <time-nuts at febo.com>
Organization: 	LeapSecond.com
To: 	Discussion of precise time and frequency measurement 
<time-nuts at febo.com>



Has anyone tried running a quartz oscillator at liquid nitrogen temperatures: -196 C (-321F, 77K)? It's probably impractical commercially, but maybe something of value to a time nut. Would that dramatically lower temperature improve phase noise & short-term performance? Is there a crystal cut that could be optimized for 77 K instead of ~25 C (room) or 60 C (oven)?

If not Nitrogen, how about dry ice (-109F -78C)?

/tvb

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