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目前,国内气象部门使用的甚高频电话系统大都没有互锁的功能,在同一网中的电台只要有两个或两个以上处于发射状态,就会发生信号阻塞现象,给用户带来不便。为此,我们研制了 Sx-1型传输接口,使袖珍计算机、传真机在 VHF 信道上实现模拟数据传输自动转换的同时增加了电台发射状态的互锁功能,安装在1025型小型单工机上,经实际应用取得了较好效果,达到了强制使系统在同一时刻只能有一个台处于发射状态,而其余台都处于接收状态的目的,避免了信号阻塞现象的发生。图1为 Sx-1型接口电路方框图(虚线部分为互锁电路)。互锁部分具体电路见图2。
At present, most of the VHF systems used by the domestic meteorological departments do not have the function of interlocking. As long as two or more radios in the same network are in a transmitting state, signal congestion occurs and the user is inconvenienced. Therefore, we developed the Sx-1 transmission interface, which enables the portable computers and fax machines to automatically convert analog data on the VHF channel and increase the interlocking function of the radio transmission state. It is installed on a small form-factor machine 1025, The practical application has achieved good results, reaching a mandatory system so that only one station at the same time in the launch state, while the remaining stations are in the receiving state, to avoid the phenomenon of signal blocking. Figure 1 for the Sx-1-type interface circuit block diagram (dotted line for the interlock circuit). Interlocking part of the specific circuit shown in Figure 2.