The WWVB 60 kHz carrier is reduced in power at the start of each UTC second by 17 dB ( to 1.4 kW ERP ) .
The WWVB 60 kHz carrier has a normal ERP of 70 kW .
The WWVB 60 kHz carrier , which has a normal ERP of 70 kW , is reduced in power at the start of each UTC second by 17 dB ( to 1.4 kW ERP ) .