I've made small corrections to the island pad capacitance computations
to reflect the copper foil thickness data provided by Grahan, KE9H. The
computed and measured island capacitance does not change, but some
intermediate results do. More details at
http://www.cliftonlaboratories.com/Prototyping.htm
I've mentioned the classic book on filters, /Handbook of Filter
Synthesis /by Anatol I. Zverev, but its current cost has been in the
stratosphere. I received an E-mail from Brad, AL4T recently informing me
that a lower cost ($58 at Amazon) paperback edition of Zverev is now
available. If you have any interest in filter design, this book should
be in your home library. Don't be put off by the equations--there's
plenty in there that can be understood with high school math and the
effort of plowing through the more complex bits are very rewarding. I
highly recommend this book. (When I checked early this year, only the
hardback edition was shown, at nearly $300, so a $58 paperback edition
is a huge savings.)
Finally, for those interested in SoftRock receivers, I've added measured
data for a Bourns 600 ohm : 600 ohm isolation transformer,
LM-NP-1001-B1. This can be used reasonably well for 24 KHz purposes and
will work up to 100 KHz if the termination impedance is carefully
selected. More details at
http://www.cliftonlaboratories.com/softrock_lite_6_2.htm.
Jack K8ZOA
www.cliftonlaboratories.com
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