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.
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.
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.
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.
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?
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.
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
@@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.
