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Both sidebands of the first local oscillator are received, and are separated in the correlator by phase-switching the local oscillators. A second local oscillator at 1270 MHz is used to down convert the IF to the 90-900 MHz band, which is sent to the correlator on underground cables. One linear polarization is received. Quarter-wave plates are available to produce circular polarization at frequencies near 90 GHz and 230 GHz. |
Credits: Pure Spanlex |
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