[ARC5] WHINK and crystals.

[Bruce Long]

The edge bevel significantly reduces crystal spurious responses and i believe the curved blank edges where also a spurious suppression technique which has been replaced by the modern practive of using only circular blanks, tuning fork and strip crystals excepted.

I spent a number of years working at Piezo, McCoy and briefly as circuit design consultant for Bliely




________________________________
 From: Kenneth G. Gordon <kgordon2006 at frontier.com>
To: ARC-5 Maillist <arc5 at mailman.qth.net> 
Sent: Thursday, June 27, 2013 1:27 AM
Subject: Re: [ARC5] WHINK and crystals.
 

So far, activity with this crystal has remained high despite the etching.

I might add that although this particular crystal was a commercial job, made during WWII, 
dated 1944 on the case, and made by Standard Piezo, the crystal blank is NOT perfectly 
square! Not by a long shot! At least two sides have a pronounced curve to them, and it is 
very obvious that all edges have been hand-ground to a bevel.

These are some of the reasons I chose that particular crystal to etch. I figured I couldn't hurt 
it.

Yet when I first tested it, it had plenty of activity, and that has not yet fallen off.

I am quite surprised, but pleased.

More tomorrow.

Ken W7EKB
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