Figure 6.3-2. RF Frequency Interference band (to protect fixed radio services which depend on tropospheric scattering). Page 433 of the same International Radio Regulations defines a limit of £-175 dBw/m^ for an isotropic antenna to permit radio astronomy movements. Finally, shipboard radars operate at frequencies <3.1 GHz. By way of comparison, based on current technology, the SPS will have a bandwidth of ±100 MHz and sidebands at -50 dBw tapering off at 15 dB/100 MHz on both sides. This will overlap as follows: • Tropo service limits 1.67 to 2.535 GHz to <-168 dBw (tropospheric scatter) — this limit will be exceeded in the vicinity of rectenna. • Radio astronomy limits <2.70 GHz to <-175 dBw — this limit will be exceeded in vicinity of rectenna (rotation of earth means no portion of sky is permanently obscured). • Shipboard radar operates at frequencies <3.1 GHz — unless rectenna is located close to navigable water, this is no problem. • Amateur radio sharing, state police radar, and high power defense radar, which operate in 3.1 to 3.7 GHz bands, have no problems.
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