[time-nuts] Improving the stability of crystal oscillators

fre_eng at g4fre.com fre_eng at g4fre.com
Fri Oct 12 09:51:14 EDT 2007

I used to use the clipon posistors to stabilise my crystals (the Murata 
BM500N previously mentioned) but after seeing some results on what 
temperature they really stabilise at versus what they should stabilise at i 
moved on to the heater controller design by John Hazell at 


note in recent iterations the crystal is embedded in the aluminium block 

After using the calibration technique he mentions to operate the crystal at 
the "knee" point oscillators have had adequate stability for 134GHz local 
oscillator usage 



> Message: 1
> Date: Wed, 10 Oct 2007 10:14:28 -0700 (PDT)
> From: Tom Clifton <kc0vsj at yahoo.com>
> Subject: [time-nuts] Improving the stability of crystal oscillators
> To: time-nuts at febo.com
> Message-ID: <195665.8473.qm at web37013.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1 
> While the website is not explicitly about frequency
> measurement, there is an interesting bit on improving 
> the stability of crystal oscillators with external
> heater controllers.  While it may not be suitable for
> long term high stability control it might be suitable
> for many other purposes. 
> http://www.qrss.thersgb.net/Crystal-Ovens.html 
> The main page is also a good read: 
> http://www.qrss.thersgb.net/Receiving-QRSS.html#Introduction

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