ConHam.org

Simplex 146.580

If you're at a security conference, and you have a ham radio license, grab your radio and set it to 146.580 simplex and say hello!

There's a lot of ham radio operators in the security community. Standardizing on one frequency lets us find each other easily. This frequency has been in use at DEF CON since at least DC16, and probably much earlier (and at other conferences as well).