Difference between revisions of "70cms filters"
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[[File:70cms 245 1.JPG|400px]] | [[File:70cms 245 1.JPG|400px]] | ||
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| + | ===Tuneable pass band filter=== | ||
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| + | Tuneable passband filter design by Ian, G3KKD, with 2 MHz band pass and 30 dB attenuation 4 MHz away. (the full article is available in CQ-TV 228). | ||
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| + | [[File:70cms filter G3KKD.JPG|400px]] | ||
===Built units=== | ===Built units=== | ||
Revision as of 17:30, 26 March 2017
There are plenty of designs available for 437 MHz filters:
Simple inter-digital filter
Design by F1DJO and F6GQM first published in CQ-TV 245
Tuneable pass band filter
Tuneable passband filter design by Ian, G3KKD, with 2 MHz band pass and 30 dB attenuation 4 MHz away. (the full article is available in CQ-TV 228).
Built units
The following suppliers sell built and tested units:
- Antennair - suppliers of the DTX1
- DG0VE - German supplier of reasonably priced filters for most amateur bands