[time-nuts] Looking for QST Jan 1990 Article on Crystal S, Q & R testing By DeMaw

Mike Suhar msuhar at woh.rr.com
Thu Dec 21 20:13:12 EST 2006


Hear are some articles on the subject worth reading:

Crystal Motional Parameters, A comparison of Measurement Approaches by Jack
R. Smith, K8ZOA, June 11, 2006
http://www.cliftonlaboratories.com/Documents/Crystal%20Motional%20Parameters
.pdf

Lesson Plan where they measured a crystal
http://www.omicron-lab.com/customer_examples/pdf/Measuring_Equivalent_circui
t_of_Quartz_crystal_II.pdf

Simplified Tools and Methods for Measuring Crystals by Jim Kortge, K8IQY
http://www.k8iqy.com/testequipment/pvxo/Atlanticon2002V1R5.pdf



I have done measurements using the techniques documented above.  I have used
various pieces of equipment such as a spectrum analyzer with tracking
generator, TAPR VNA, and the HP 3586C Selective Voltmeter with its internal
tracking generator.  I noticed the transformer jig as documented by K8IQY
left something to be desired in my measurements.  This was confirmed in the
first document by K8ZOA where his table of test jigs and methods did not
fair very well with the transformer jig.  I ended up settling on a 50 to
12.5 ohm minimum loss pad on both sides of the crystal and the HP3586C for
the measuring instrument. 

I have not read, at least recently to remember anything about it, the QST
1990 article. I probably have it on my QST CD collection. I will have to
look it up.

Mike


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: Wednesday, December 20, 2006 5:15 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Looking for QST Jan 1990 Article on Crystal S,Q & R
testing By DeMaw

Hi:

I'm looking for  the subject article on crystal testing, or any other 
articles on testing crystals.
This is more related to knowing if a given crystal is alive than 
characterizing it, i.e. a Crystal Activity Meter type thing.

Have Fun,

Brooke Clarke

-- 
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com


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