The predicted noise states that we have to be 100 MHz away from the carrier frequency. Based upon the maximum pointing error of 1 arc minute and the noise band of ±50 MHz, the noise level at the phase receive frequency may be too high. This would require a pilot frequency of fT (one-half the transmit frequency) or 2 fT (double the transmit y- frequency) or an integral multiple of fT to avoid z the noise level generated at the carrier frequency and make for noise-free phase control.
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