Listen to Bakersfield Police Radio Frequencies Online Free; Listen to Baltimore Police Scanner Online Free; Listen to Boston Police Radio Frequencies Live Online Free; Listen To Chicago Police Radio Frequencies Online Free; Listen to Cincinnati Police Radio Frequencies Online Free; Listen to Colorado Springs Police Scanner Frequencies Online Free 10 Clark Dept. Code 4 Status ok The City of Portland switched over to its 700 MHz P25 trunked radio system several months ago for public safety bureaus, including police and fire. 04, CLARK COUNTY TRUNK SYSTEM (SIMULCAST) (CONTROL CHANNEL) ch.