Transmission System
| WWVH antenna coordinates | |
|---|---|
| 2.5 MHz | 21°59′20.9″N 159°45′52.4″W / 21.989139°N 159.764556°W / 21.989139; -159.764556 |
| 5 MHz | 21°59′10.8″N 159°45′44.8″W / 21.986333°N 159.762444°W / 21.986333; -159.762444 |
| 10 MHz | 21°59′18.2″N 159°45′51.3″W / 21.988389°N 159.76425°W / 21.988389; -159.76425 |
| 15 MHz | 21°59′15.3″N 159°45′50.0″W / 21.987583°N 159.76389°W / 21.987583; -159.76389 |
WWVH broadcasts its signal on four transmitters, one for each frequency. The 2.5 MHz transmitter puts out an ERP of 5 kW, while the other transmitters use 10 kW of ERP. The 2.5 MHz antenna is one half-wavelength tall, and radiates in an omnidirectional pattern. The remaining antennas each consist of two elements one half-wavelength tall and horizontally separated by one quarter-wavelength. The signal radiating from one element is in quadrature phase with respect to the signal from the other. This results in a cardioid radiation pattern with a maximum gain directed west.
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