11. At microwave frequencies moisture in the atmosphere ( rain fade ) can degrade transmission. 12. The microwave frequencies used in microwave ovens are chosen based on regulatory and cost constraints. 13. At microwave frequencies this allowed for a smaller antenna. 14. It was home to a 26-metre antenna and several smaller VHF and microwave frequency antennas. 15. Printed circuit technology makes this type antenna cost effective at microwave frequencies exceeding 1 GHz. 16. Amateur operations use VHF, UHF and microwave frequencies . 17. General advances, such as HEMT, in noise reduction at microwave frequencies have also had an effect. 18. Parametric oscillators have been developed as low-noise amplifiers, especially in the radio and microwave frequency range. 19. Today most, if not all, radar operates on microwave frequencies , said Stover, who lives in Dallas. 20. Because of their high frequency capability, Gunn diodes are mainly used at microwave frequencies and above.
