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首页> 外文期刊>Electrical Engineers - Part IIIA: Radiocommunication, Journal of the Institution of >A centimetre-wavelength beam telephone
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A centimetre-wavelength beam telephone

机译：厘米波长光束电话

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摘要

The paper describes the principles of operatipn and some constructional details of a light-weight radio-telephone link operating in the 3-cm wavelength band. It is suitable for operation over optical paths of about 10 miles in length, and can be used to bridge a gap in a telephone line. Duplex operation is achieved by the use of one valve simultaneously as transmitter and as local oscillator for the receiver, making send/receive switching unnecessary. The aerial system is highly directional, and this gives a degree of security and freedom from jamming, which permits several sets to be operated in close proximity to one another. The operating power can be drawn either from a.c. mains or from a 12-volt battery, the drain being approximately 100 watts per set in either case. Longer-range links using the same system could be developed by using increased transmitter power and higher aerial gains, but it is suggested that for longer ranges a longer wavelength of about 6 cm would be preferable.
机译：本文描述了在3 cm波段工作的轻型无线电话链路的工作原理和一些结构细节。它适合在长度约10英里的光路上进行操作，并可用于桥接电话线中的间隙。通过同时使用一个阀作为发送器和接收器的本地振荡器来实现双工操作，从而无需进行发送/接收切换。空中系统具有高度的方向性，这提供了一定程度的安全性和免于干扰的能力，这使得几套设备可以彼此靠近操作。可以从交流电中提取工作功率主电源或12伏电池，每种情况下的耗电量约为每套100瓦。可以通过使用增加的发射机功率和更高的天线增益来开发使用同一系统的更长距离链路，但建议对于更长距离，最好使用约6 cm的更长波长。

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