| 1. | Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread .
无线电射束也象探照灯的光束一样，是不能高度集中的；它总要散开。 |
| 2. | Ironically, the detailed reasons as to how the radio beam is produced may not be important astronomically .
具有讽刺意义的是，产生射电波束的详细原因在天文上，这也许并不重要。 |
| 3. | Western union installs the first commercial radio beam system
西部联合电报公司安装第一个商用无线电波束系统。 |
| 4. | Coded radio beam
编码无线电波束 |
| 5. | Instead of generating a radio beam , the array creates a “ personal cell ” that can be only centimeters in radius
这种阵列不再制造无线电波束，而是产生半径只有数公分大的个人单元。 |
| 6. | Notice that in both these examples the radio beam generated for one cell - phone user does not reach the other
注意，在上述两例中，针对其中一名用户产生的无线电波束，并不会抵达另一位用户的所在位置。 |
| 7. | An antenna array that is truly smart would be able to aim a radio beam directly at a mobile user instead of choosing a beam that comes relatively close
一个真正聪明的阵列天线，必须能够直接把波束瞄准行动用户，而不是选用与用户较为接近的波束。 |
| 8. | And when the array transmits back to the cell - phone user , the processor sends an out - of - phase signal to one of the antennas , generating a radio beam that runs from north to south
当阵列发射讯号给行动电话用户时，处理器会传送一个异相的讯号到其中一个天线，产生由北往南的无线电波束。 |
| 9. | Because the processor is fast enough to perform this task many times a second , the array can continually readjust the radio beam as the cell - phone user walks or drives across the array ' s coverage area
因为处理器的速度很快，可在一秒内执行多次工作，所以当行动电话用户在阵列涵盖?围内行走或开车时，阵列可不断重新调整无线电波束。 |
