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April 15th 04, 09:16 PM
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warren wrote:
On Thu, 15 Apr 2004 09:20:59 -0700, jopl wrote: . A Traveling-wave antenna is used for satellite up-link communication. The signal is a microwave frequency up into the (multi) GHz region of radio waves. The transmitting tube is a traveling-wave tube, which is powered by a special pulsed amplifier. A familiar use for this set-up is to relay telephone signals (from U S Sprint, etc.) up to the satellite and then down load to another ground station where the signal is converted back into a telephone signal and sent (over land line) to the person you called. This eliminates the use of land-lines most of the way for your long-distance telephone calls. There are also many military uses for this type of technology. By the way, the signals are fed from the amplifier through Wave-guides (a hollow rectangular cross-section sections that are held together by flanges), rather than by wires. It would be similar to a squared-off hose section, connected to other hose sections, if this makes the concept easier to understand. Waveguides have much less loss than wire or cable and because of the ultra-high frequencies involved, are much more efficient. Hopes this gives you some idea of this type of communication. Regards warren And here's a site that talks about power waves: http://www.thepowerwave.com/ :-) ac6xg |
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