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Help about Helical filter

时间:04-08 整理:3721RD 点击:
Can I adjust center frequency and bandwith of a Helical frequyency, which I bought from Digikey?
For example, I bought a Helical filter from Digikey, 5HT-73565F-735 with 735 MHz center frequency and 15MHz Bandwith. Can I adjust it to a filter with 766MHz center frequyency and 40 MHz Bandwith and How to do?
Thanks alot!

in a word ... no ... the helical filter has inductors that have been cut to resonate at that specific freq. with that appropriate bandwidth rolloff

now maybe you would like to try and open the filter up very carefully and trim (shorten) the inductors a little bit to increase the resonant freq that may or may not be possible depending on how difficult it is to pull apart without destroying it
If its anything like the common twin can helical resonators I have seen/used for those and similar freqs, its going to be extremely difficult to impossible to do

You really need to search for a product that covers your requirements :)

cheers
Dave

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