<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=US-ASCII" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 9.00.8112.16441"></HEAD>
<BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>
<DIV>
<DIV>In a message dated 19/03/2012 17:19:12 GMT Standard Time,
donley.dn@comcast.net writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>I am
intrigued by your stated project - 'a "high-performance" crystal tester
<BR>and evaluator'. I have been searching for the ultimate, all-encompassing,
<BR>all-frequency crystal tester. I would appreciate any information you could
<BR>share on this project. Most testers that I have found have holes in the
<BR>frequency ranges that they
test.<BR><BR>73<BR>Richard<BR>kc9ub<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>Hi Richard</DIV>
<DIV> </DIV>
<DIV>I use a Type 193a Crystal Activity Meter for fundamental parallel resonance
crystals which dates back to WWII and does fairly well. I have made several
attempts to do a solid state equivalent but none work as well as the
original.</DIV>
<DIV> </DIV>
<DIV>STC in the UK made a series resonant test set many years ago but I
have never managed to get my hands on a circuit diagram.</DIV>
<DIV> </DIV>
<DIV><FONT lang=0 size=2 face=Arial FAMILY="SANSSERIF"
PTSIZE="10">73<BR></FONT><FONT lang=0 color=#0000ff size=4 face=Arial
FAMILY="SANSSERIF" PTSIZE="14"><I><BR>Bob</FONT><FONT lang=0 color=#000000
size=2 face=Arial FAMILY="SANSSERIF" PTSIZE="10"></I><BR>Bob F Burns<BR>C Eng,
FIET, MSE<BR>Amateur Radio Callsign: G3OOU<BR>Registered RSGB
Instructor<BR>G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB:
TQ25<BR>Secretary of Crystal Palace Radio & Electronics Club: <A
href="http://www.g3oou.co.uk/">www.g3oou.co.uk</A><BR>Technical web site: <A
href="http://www.qsl.net/g3oou">www.qsl.net/g3oou</A></FONT></DIV></FONT></BODY></HTML>