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# Radio Communication Guidelines **NOTE:** Simplex channels allow users to talk over each other without any warning. Strict radio discipline must be maintained. The radio will not honk if the channel is busy and listen before transmitting for confirmation. **SIMPLEX CHANNELS:** 1. SIMPLEX 1, 2,...

# Radio Communication Guidelines **NOTE:** Simplex channels allow users to talk over each other without any warning. Strict radio discipline must be maintained. The radio will not honk if the channel is busy and listen before transmitting for confirmation. **SIMPLEX CHANNELS:** 1. SIMPLEX 1, 2, 3, and 4 (A-13, A-14, A-15, and B-15) are region-wide simplex channels common to Multnomah, Clackamas, and Washington Counties for use in incidents and drills. The limited power and range of simplex channels means neighboring counties should not interfere with each other. 2. Simplex channels assigned at an incident will not be monitored by dispatch and will not be recorded. The Incident Commander must maintain communication with Dispatch at all times typically on the assigned talkgroup. **MAYDAY CHANNEL:** 1. The Mayday Channel is a region-wide simplex channel used for reporting firefighters in distress or loss of communication within Multnomah, Clackamas, and Washington Counties. Chief Officers monitor the channel in each county. Mayday is located at position 16 on the channel selector. 2. On-duty response chiefs (C1, C2, C3, C4, and C103) have dedicated portable radios assigned solely to the Mayday Channel. These radios remain on in their chargers at all times with the volume turned up. **OTHER CHANNELS/TALKGROUPS:** 1. **State Fire Network (STATE FIRE):** This is a state-wide VHF channel administered by the State Fire Marshal for tactical communications amongst fire suppression forces within the state.