In reply to MSF's message of Thu, 30 Dec 2021 00:32:28 +0000: Hi, [snip] > >On the other hand, you could go totally old school and use a coherer. The mail >deliverer might object to the long antenna on the mail box, but it could work. >Check out my favorite coherer link: > >http://sparkbangbuzz.com/els/coherer-el.htm > Unfortunately this might also pick up signals from elsewhere. I think the motion detector is better. :)
I suspect they use built in security codes to ensure that the receiver only responds to signals from the matching transmitter. Regards, Robin van Spaandonk <mixent...@aussiebroadband.com.au>
