[Elecraft] Manuals: Old-Radio...specially Zverev

[jsodus at comcast.net]

Hello, 

This note is about Zverev's book "Handbook of Filter Synthesis". 

As far as I know, there was only one edition. 
If there was a second, then perhaps the errors were corrected. 
Maybe there is an errata-sheet available 

But, if one is buying the first edition, be aware that the book is full of mistakes. 
Three things that come to mind most notably are: 
1. the section on band-reject filters. 
2. element values for the Cauer designs did not match up to the gold-standard I used; it is regrettable that I cannot recall the name of that book (maybe by Telefunken) because it has been almost twenty years since I used it; personally, I would not trust any Cauer values from Zverev. 
3. toward the end of Zverev, his chapter on network transformations (equivalent circuits) has issues as well. 

I used Zverev from 1970 to 1997 and marked-up in red pencil the mistakes concerning designs on an "as needed" basis. 
Usually the mistakes were encountered while under a pressure deadline to get a quote out quickly. 

Not that it probably matters now-a-days but, if you wanted to make a n=6 or n=8 0.05 degree phase-ripple crystal-filter, Zverev does not have it. 

Zverev's style of writing was to take a simple task and write it up as incredibly complicated as can humanly be done; just my opinion. 

73 Jerry KM3K