2.2.1.2 Carrier tracking degradation An interfering CW signal can induce a phase modulation on the desired carrier signal when the frequency separation between the two signals is comparable to, or less than, the phase locked loop bandwidth. A maximum acceptable phase modulation of 10° amplitude results from an interference-to- carrier power ratio of - 15 dB. The design margin for carrier tracking is typically 10 dB with reference to the noise power in the carrier tracking loop bandwidth. For maximum acceptable carrier tracking degradation, the power in a CW interfering signal that may be within the phase locked loop bandwidth must not be greater than the amount shown in Table I. TABLE I - CW interference with carrier tracking 2.2.1.3 Telemetering degradation Telemetering degradation is defined as the amount by which the signal-to-noise ratio must be increased to make the bit error rate, when an interfering signal is present, equal to that which it would be if the interfering signal were absent. The maximum allowable degradation for deep-space telemetering is I dB. For coded telemetering with a threshold signal-to-noise ratio of 2.3 dB, CW interference 6.8 dB below the noise power will result in I dB degradation. For uncoded telemetering with a threshold signal-to-noise ratio of 9.8 dB, CW interference 5 dB below the noise will result in 1 dB degradation. The noise power is proportional to the data bandwidth and the receiver noise spectral density. Examples of allowable level of CW interference are shown in Table II. TABLE II - CW interference with telemetering
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