Crystal Filter Experiments

[@MegaCadr]

I don’t know what other channel that I watch every new video start to finish as soon as it drops. Another fantastic video! I was part way through building a superhet transceiver by building each module, and the crystal filter was the most fun to build.

[@m1geo]

I really like the AADE Designer tool. I have one of his AADE LCR meter. Great demonstration! 👌

[@johnwest7993]

Me too. Mine was one of my most useful tools, although I've pretty much switched to using a NanoVNA because of all of the info provided across a wide frequency range in just a few seconds.

[@allkias]

Thanks a lot. Would be very appreciated analyzing also N-path filters which are also characterized by very narrow-band frequency response.

[@johnwest7993]

Thank you.

[@alexengineering3754]

Interesting videos thank you. Everyone love Software defined radio's

[@themechanicly83]

Hi there for the demonstration of the filters with the sdr software with rtlsdr hardware there are horizontal lines in the waterfall which oszilate a bit over time. If i am not mistaking i would think this could be the automatic gain control adjusting amplification making the comparism wrong. What do you think?

[@themechanicly83]

I just saw the agc s are disabled. Why do you think this happens?

[@FesZElectronics]

I guess that there are some very strong signal appearing that are overdriving the pre-amplifier, or just the input stage, and then it behaves as if the AGC is still on; or maybe its just a protection mechanism that cannot be turned off. I'm not sure what happened.

[@ashispradhan4237]

Is order of the filter the only reason why there were some extra spikes in the filter response ? Or is it also because of the imperfections in the crystal ? Also how can we get rid of those spikey responses ? Excellent video though.

[@FesZElectronics]

The spikes are caused by the imperfections in the crystals, but my assumption is that a higher order filter would filter these spike out since each crystal has its imperfections different from other crystals.

[@chengL10]

Thank you for the video, it was really helpful. Can I know the data sheet of the second filter of 10.7MHz ?

[@FesZElectronics]

Do you mean the 10.7MHz ceramic resonator? I used the same resonator in both measurements (with and without the 220R resistors); unfortunately I do not have a datasheet or order code for this component since it was just a random component I found in a box

[@chengL10]

@@FesZElectronicsthank you anyways :)

[@RasoulMojtahedzadeh]

You forgot about Monolithic Crystal Filters (MCF) :-)

[@ajingolk7716]

Its a saw filter 🤷🏻‍♂️

[@Dazzwidd]

Feszzzzzzzzzz.....

[@alejandroperez5368]

Consider changing your greetings at the beginning.

[@FesZElectronics]

What would you suggest as better option?

[@tcarney57]

@@FesZElectronics He wants one he likes. That he didn't offer any specific suggestions at all means he gave it no thought and doesn't really care in the first place. BTW, there's nothing wrong with your greetings. Ignore this guy.