广州中心气象台的甚高频无线电话机，其主机在23楼，而主要控制部分如喇叭、话筒及收发开关则安装在4楼，两者通过电缆连接。这样由于甚高频发射机在楼顶，避免了因加长高频电缆而引致发射功率降低，从而改善通话效果。但在实际设计中，必须解决两个问题：一是可静噪，使机器不 VHF radiotelephone at the Guangzhou Central Meteorological Observatory has its mainframe on the 23rd floor, with the main controls such as speakers, microphones and transceiver switches installed on the 4th floor, both connected by cables. In this way, because the VHF transmitter is on the roof, it avoids the decrease of transmitting power caused by lengthening the high-frequency cable, so as to improve the call effect. However, in actual design, two problems must be solved: one is that it can be mute so that the machine does not