It is possible to alleviate the problems by using narrow band notch filters in the radio astronomy receivers. It should be remembered that, unlike the noise which covers the whole spectrum, the harmonics have a very narrow band. It is therefore possible to design a filter which specifically inhibits the harmonics. 10. 3 CONCLUSIONS AND RECOMMENDATIONS For both amplitron and klystrons a. Selection of 2. 45 GHz is recommended as the operating frequency. b. Harmonic filters at the rf generators are needed to meet commercial service regulations. c. Radio astronomy and similar sensitive receiving systems will need notch filters to protect against MPTS harmonics. d. Multiple SPS installations require further in-depth investigation. For the amplitron: a. A bandpass filter is needed to improve performance relative to radio astronomy noise regulations. b. Noise level with filter added is estimated to exceed radio astronomy isotropic regulations between 2. 3 GHz and 2. 7 GHz, and to exceed radio astronomy 60 dB antenna regulations above 1. 9 GHz. Early development of the amplitron and filters is required to establish noise characteristics. For the klystron: a. Noise level exceeds radio astronomy isotropic regulations only in USA industrial band of 2. 4 GHz to 2. 5 GHz. b. Noise level exceeds radio astronomy 60 dB antenna regulations between 2. 1 GHz and 2. 85 GHz.
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