EMRFD Message Archive 7323

Message Date From Subject
7323 2012-03-11 01:07:58 ha5rxz An Interesting Method Of Tuning Bandpass Filters
The topic of LC bandpass filters has been mentioned before but I don't think I have ever seen this method of tuning a filter for the correct response:

http://www.johansontechnology.com/en/technical-notes/rf-capacitors-a-inductors/dishal-bandpass-filter-tuning-using-lasertrimr-chip-caps.html

Ignore the mention of laser trimming in the URL, the page describes an interesting method of tuning which starts off with most of the filter elements shorted out.

I wonder if this could be made to work with crystal filters?

Peter HA5RXZ
7326 2012-03-11 08:39:02 kb1gmx Re: An Interesting Method Of Tuning Bandpass Filters