| 摘要 |
PURPOSE:To use a main converter at two frequency bands by using an additional converter so as to convert the 1st frequency band into the 2nd frequency band in a system receiving the two frequency bands using one antenna. CONSTITUTION:In case of the reception of 4GHz band, a signal from a satellite is convered into an IF signal in IGHz by a low noise converter 21 aud fed to an indoor receiver via a cable 24. On the other hand, in case of the reception of 12GHz band, the signal from the satellite is converted into a 4GHz band signal by a 12GHz low noise converter 22. The converted 4GHz band signal is resent toward the antenna 23 via a primary field 225. The signal reflected in an antenna 23 is converted into a lGHz band IF signal by the 4GHz band converter 21. Thus, a signal in 12GHz band is received by using the 4GHz band converter 21.
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