Create radio receiver circuits with the LM386 audio amplifier
I didn’t have much luck using an LM386 as an audio amplifier (I needed more output power), but perhaps I’ll have more success using it to make a regenerative receiver. I think that I even have all the parts in my junk box.
Here’s a schematic from the article:
Is Ham Radio a Hobby, a Utility…or Both? A Battle Over Spectrum Heats Up
This was actually last summer’s controversy, but while the arguments about WinLink have cooled down, it’s still an issue. I used to be quite anti-WinLink, but since it seems to really be useful for emergency communications, I’m less strident about it than I used to be. I just searched fcc.gov to see if I could find out what’s going on with RM-11831, and was surprised to see that as recently as April 3, 2020, there were still comments being filed. So, I guess it ain’t over until it’s over.
Determining Resonator Q Factor from Return-Loss Measurement Alone
The author uses an expensive VNA from his employer, Copper Mountain Technologies, but with a little ingenuity, you can probably do with your $60 NanoVNA.