Paulo Bauer Jorge ) writes:
Hi...
I'm looking for Wes Hayward's article "A unified approach to the
design of crystal ladder filters" which appeared in QST May 1982
p.21-27.

Big thanks in advance

You may be able to get the issue from QST, provided they still ahve
copies, for a small fee. And unless they stopped the practice, if
they no longer had the back issue they would photocopy the desired article
for a small fee.

You can buy QST on a CDROM, and get 5 or 10 years of other articles at
the same time.

The article, along with a second, July 1987, article from the same author
on the topic, and Doug DeMaw's January 1990 about building a tester for
measuring the crystals for such filters, were reprinted in the back of
"W1FB's Design Notebook".

And surely the same ground, if not the exact same material, is covered
in the relatively recent book from the ARRL, "Experimental Methods in RF
Design". Its authors include Wes Hayward.

Michael VE2BVW