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Page updated May 15, 2007
HAARP HF Transmitter Performance Calculator
First select an array size
The HF Antenna Array can be operated at any size up to 12 X 15 elements.
System performance depends of the number of active elements that are
actually in use within the array. Please select an array size (number
of columns by number of rows).
Next, select a frequency
The HAARP HF Transmitter is limited to the frequency range 2.8
to 10 MHz. Selections below this range will be converted
to 2.8 MHz.
Next, select an ionospheric layer height
The power density in the ionosphere along with the size
of the interactive region are both affected by the array size and
frequency that you have already set, and by the altitude of the
Please note that the algorithm used here is based both on theoretical calculations
of antenna array performance as well as on engineering measurements of the
actual performance that has been achieved. The most recent update to the algorithm
predicts slightly lower system performance as a result of the natural tapering (or
decrease) in transmitter power that occurs for antenna elements near the edges
of the array.
Pioneering Ionospheric Radio Science Research for the Twenty-First Century
The High Frequency Active Auroral Research Program