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#1
January 14th 06, 03:23 PM
posted to rec.radio.amateur.homebrew
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Crystal ladder coupling constants.
I am writing a simple program to design crystal ladder filters using the formulas from W7ZOI's excellent QST article A Unified Approach to the Design of Crystal Ladder Filters. QST May 1982. I have got the tables of normalised coupling constants for Butterworth and 0.1dB Chebyshev filters from the QST article. I would like to find a source of similar tables for filters with more than 5 poles and for passband ripple other than 0.1dB. Many Thanks. 73, Ed. EI9GQ. -- Linux 2.6.15 Remove 'X' to reply by e-mail. Yes, my username really is: nospam |
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#2
January 16th 06, 08:56 PM
posted to rec.radio.amateur.homebrew
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Crystal ladder coupling constants.
Eamon Skelton wrote: I have got the tables of normalised coupling constants for Butterworth and 0.1dB Chebyshev filters from the QST article. I would like to find a source of similar tables for filters with more than 5 poles and for passband ripple other than 0.1dB. Many Thanks. 73, Ed. EI9GQ. Handbook of Filter Synthesis by Anatol I. Zverev (now available in paperback) is the best book I've ever seen on this topic. It even has tables for lossy filter elements. Zack Lau W1VT |
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#3
January 16th 06, 11:30 PM
posted to rec.radio.amateur.homebrew
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Crystal ladder coupling constants.
Handbook of Filter Synthesis by Anatol I. Zverev (now available in paperback) is the best book I've ever seen on this topic. It even has tables for lossy filter elements. Zack Lau W1VT From where Zack? My hard copy has the pages falling out of it. W4ZCB |
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#4
January 17th 06, 01:35 AM
posted to rec.radio.amateur.homebrew
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Crystal ladder coupling constants.
Harold E. Johnson wrote: Handbook of Filter Synthesis by Anatol I. Zverev (now available in paperback) is the best book I've ever seen on this topic. It even has tables for lossy filter elements. Zack Lau W1VT From where Zack? My hard copy has the pages falling out of it. W4ZCB Amazon has it, £44.50 (UK). Leon |
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#5
January 17th 06, 10:38 AM
posted to rec.radio.amateur.homebrew
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Crystal ladder coupling constants.
On Mon, 16 Jan 2006 11:56:43 -0800, Zack wrote:
Handbook of Filter Synthesis by Anatol I. Zverev (now available in paperback) is the best book I've ever seen on this topic. It even has tables for lossy filter elements. Zack Lau W1VT Thanks Zack, 73, Ed. EI9GQ. -- Linux 2.6.15 Remove 'X' to reply by e-mail. Yes, my username really is: nospam |
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#6
January 18th 06, 01:12 PM
posted to rec.radio.amateur.homebrew
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Crystal ladder coupling constants.
On Sat, 14 Jan 2006 14:23:09 +0000, Eamon Skelton wrote:
I would like to find a source of similar tables for filters with more than 5 poles and for passband ripple other than 0.1dB. I got the Tables from Zverev's book. Many thanks, 73, Ed. EI9GQ. -- Linux 2.6.15 Remove 'X' to reply by e-mail. Yes, my username really is: nospam |
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