Hackaday (unofficial) October 20, 2021 3:00am Sign Detects RF to Show You are on the Air #ledhacks #edgelighting #edgelit #hamradio #ontheair #ontheairsign #hackaday posted by pod_feeder_v2 Sign Detects RF To Show You Are On The Air Like a lot of hams, [Stuart] wanted an “on the air” sign. These signs often connect to a PTT switch or maybe an output from the transmitter that also does things like switches antennas …