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| | Patent 5548839 |
 | | 4 provides a tunable local oscillator signal L01 to the single tunable frequency translator 116, where it is mixed with the current RF input signal passed by single-pole, double-throw switch 118. |
 | | The resulting intermediate frequency is passed by single-pole, multiple-throw switch 120 to one of band pass filters 122, 124, 126 and 128 appropriate to the relevant communication, navigation, or interrogation function as determined by control 130 (not shown in detail). |
 | | Accordingly, switch 174 has to be a triple throw switch to provide such inputs on each of three possible paths to the common output. |
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