Passive airband bandpass filter - Butterworth 12th order

122

02:43:15

This is a passive filter designed for the VHF air band from 108MHz to 137MHz using the Butterworth response as a 12th order filter.
Building this circuit needs to be done with great care, coils need a Q of at least 50 and it must be properly terminated into 50 ohm.

published 11 years ago

hurz

11 years ago

It seems to work fine, its a pain in the a.. to make and test filter circuits in transient mode. Igor (the inventor of EC) was talking a while ago about a bode diagram feature, i would love it for those circuits.

Chryseus

10 years ago

Yeah a way to make bode diagrams would be awesome, it would also be nice if you could easily sweep sources and change the transient time step, I used Omicron QuickFil for the design which is a great bit of free software.

hurz

10 years ago

A Bode diagram would be like a sweep, but with infinte slow sweep speed to not cause ringing or any modulating effects

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