AM Transmitter

This station broadcasts emergency local information in Snoqualmie, WA. TH purpose of these stations in the US are for low power communications to the community for travelers information and also for emergency broadcasts.

• Callsign: WQHF574 

• Frequency: 1650KHz

• Transmit Power: 10 watts peak power at full AM modulation

• Antenna db: roughly -10db for a total ERP of approx. 1 watt. 

• Timing: The station broadcasts continuously.

More details

This particular station is actually two stations that simulcast on 1650 AM. The second station is located in North Bend, WA and both are fed by a signal on 72.92 MHz (a "link" transmitter) that controls the 2 stations for simulcast purposes, the audio must be in sync. The RF frequency is controlled by a GPS disciplined frequency source which watches the US GPS constellation for frequency accuracy and a single source of frequency stability. 

It produces a 2 tone control signal to turn on a number of sign post flashing lights that alert the driving public of an emergency and urge them to tune to the station for emergency messages.