urn:nasa:pds:context:instrument:arecibo.305m.trans_s 1.1 1.21.0.0 Product_Context 2024-05-22 1.1 Updated to PDS IM v1.21.0.0. Updated version_id. Added references Added content to Instrument:description. 2020-01-14 1.0 Initial export from OLAF urn:nasa:pds:context:telescope:arecibo.305m instrument_to_telescope 305-m fixed spherical reflecting antenna Arecibo Planetary Radar Transmitter Radar The Arecibo Planetary Radar Transmitter transmitted 1 MW continuous output power at 2380 MHz with a 27 MHz bandwidth (1 dB). When transmitting 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.