My Dad and I took a road trip to tour the 1 MW FM community tower in Crestwood, MO, serving the entire St. Louis metro area combining 10 FM radio signals into two antenna systems. Special thanks to the Audacy engineers who allowed us to take a peek at their (very clean!) transmitter rooms and equipment! Support me on Patreon: https://www.patreon.com/geerlingguy Sponsor me on GitHub: https://github.com/sponsors/geerlingguy Merch: https://redshirtjeff.com/ Main Channel: null #Radio #Transmitter #Engineering Contents: 00:00 - The Supertower 01:52 - Grounding and Guy-Wires 03:11 - Tower-scale cable management 04:13 - Transmitter Room 05:49 - 400A power and backup power 07:09 - 50kW Dummy load, switching, and 30kW water cooling! 09:16 - MARTI filter cans and cable loss 10:37 - In the basement - from 30 to 300 kW 12:47 - Giant coax with explosive arcing potential 14:00 - Tower safety: RF lockout 15:01 - Power, Aux services, Comms, and Lights 16:41 - One tower, many stories