Re: 12V Power for the Pi (was Re: [RaspberryPi-4-HamRadio] Getting back to the RPi)
And yet the previously referenced article ( https://www.amsat.org/amsat/articles/g3ruh/109.html) says:toggle quoted messageShow quoted text
"One is that the channel is not DC coupled. It could never be so in an FM system unless one could guarantee both transmitter and receiver were always exactly on frequency and had no drift. As this is virtually impossible to achieve, one simply AC couples the channel, i.e. gives it a response down to a few Hz, and exploits the feature of the randomised data that it has a negligible DC component."
I always thought AC coupling was often via a transformer.
That's okay, I'm a native of the State of Confusion.
I'll crawl back under my rock now.
Eric wrote on 12/31/19 8:31 PM:
I think I remember reading that 9600 bps requires DC coupling to the modulator.