Amateur radio, milliwatts transmission, million meters distance?

Interest Groups
#1
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#2

I thought that, at least in the US, one way transmission was not allowed except for things like code practice and ARRL bulletins. I’m likely missing something.

#3

And propagation beacons

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#4

Post brings to mind QRP and Sprat Magazine.
Walter was into this.
http://www.gqrp.com/sprat.htm

#6

What defines the line between attended and unattended per FCC? I did some reading a while back seeking to understand whether repeaters are considered attended or unattended and I don’t recall if I got a satisfying answer that was applicable to things other than repeaters which are clearly permitted.