I built a coherer-based receiver with a simple decoherer mechanism, and connected it to a Beaglebone to decode the received signals. For details see - ashishrd.blogspot.com/2016/03/...
Nice Video, nice project. It is a strange idea, using such a vintage radio transmitter and receiver setup with a modern computer for decoding the signals.
I am constantly looking for transformers like that one, but in Netherlands you can only get thos small low wattage ignition coils, because car parts are destroyed instead of reused.
0:35 "Back EMF from the ignition coil" & the relay's coil? I mean you don't want arcing at the relay contacts, so the capacitor absorbs the relay's countervoltage too?
Without an antenna it is about 20-30 ft. Of course back in the day when spark transmitters were legal, you could add an antenna and send signals quite far.
@@AlexBurtonMusic Well, that is not correct. Spark transmitters have been banned since 1928 by ITU regulations. Ships were allowed to use the as emergency transmitters until the 1960's. Now, if you are referring to this video, as a very low power demonstration, that is OK unless it causes interference. The original post asked about attaching a large antenna. That is not permitted. Cheers.
