Planning Overview

In the spring of 2021, the PSERN Project conducted a Final Radio Inventory of all 800 MHz radios currently being used by King County Emergency Communication System (KCERCS) radio end-users. This equipment information will be used to place the order for the new PSERN radios and to develop the plans for deployment of radios to all end-users, beginning in fall 2021, based on a Deployment Wave Schedule. More information will be sent to end-user agencies and posted as available.

Coverage Testing

To ensure that radio end-users (first responders and other emergency response personnel) will have adequate radio communications on the new system, the PSERN Project will conduct coverage testing throughout King County. Testing will involve testing staff physically traveling throughout the county, on every accessible roadway and major waterway, to verify the system meets the requirements.

For testing purposes, King County has been plotted into .2-mile squares, referred to as tiles, and the assessments will be made per tile. Testers will cover each tile twice, measuring both:

  • Channel performance (e.g. signal quality)
  • Audio quality (e.g. “Can you hear me now?”)

PSERN Coverage Testing within the metropolitan area will last approximately 6 months (April – October 2021) and be conducted Monday – Friday, between 6am – midnight. This duration and the times of day allow testing of the varied conditions that first responders and local government radio end-users may experience when they are needing to use the PSERN radios. The public can expect to see dark blue 7-passenger vans, with yellow strobe lights on the backend and antennas attached to the vehicle roof, driving slowly (e.g. 25 MPH) throughout King County during that period of time.

The PSERN Project will notify E-911 Dispatch Centers and law enforcement, so that they are aware of the testing, but if anyone has questions, they are encouraged to contact


%d bloggers like this: