The Results of the LES-5 and LES-6 RFI Experiments
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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The RFI environment near synchronous orbital altitude in the band 255-280 MHz was measured by subsynchronous Lincoln Experimental Satellite-5 LES-5. Similar measurements covering the band 290-315 MHz have been made by station-kept LES-6. The nominal sensitivity of the LES-5 RFI instrument signal- noise corresponds to Earth-surface transmitter EIRP of 50 to 100 w RHCP near 255 MHz. LES-5 sensitivity is 20 db poorer toward the high end of its band 280 MHz. The nominal sensitivity of the LES-6 RFI instrument corresponds to EIRP of 10 to 25 w RHCP across the band 290-315 MHz. The success of the LES-5 and -6 RFI experiments show that it is practical to monitor the level of activity in selected bands of the communication spectrum, throughout wide portions of the Earth, from synchronous orbit. This capability may be useful in the management of portions of the electromagnetic spectrum where frequency allocations are at a premium.
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