Arecibo Planetary Radar Transmitter
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            The Arecibo Planetary Radar Transmitter transmitted 1 MW continuous output power at
            2380 MHz with a 27 MHz bandwidth (1 dB). When transmittiing through the Arecibo
            Telescope, the peak Effective Isotropic Radiated Power (EIRP) was approximately 20
            TW. It could be phase, frequency, and amplitude modulated. Between 1974 and 1997 the
            peak output power was 450 kW, or 7 TW EIRP.  Before 1997, the telescope gain, and
            thus EIRP, depended significantly on telescope pointing, as the illuminated area of
            the reflector was reduced at zenith angles above 10 degrees.