为了使振荡频率稳定并降低谐波失真，需要加入一个在震荡频率处能够提供单位增益的负反馈路径。
Additional negative feedback is provided to set loop gain to unity at the oscillation frequency, to stabilize the frequency of oscillation, and to reduce harmonic distortion.
根据本发明提供的技术方案，可以有效抑制端口的震荡频率，并减小端口震荡对通信设备及整个网络稳定性的影响。
The technical scheme can effectively inhibit the oscillation frequency of the port and reduce influence on the stability of a communication device and the whole network by port oscillation.
用高温晶体震荡器、分频器和反向器形成新的工作所需的工作频率逻辑方波，以提高工作频率精度和温度的稳定性；
High temperature oscillator, divider and inverter produce logic square wave for working frequency so that precise frequency and stable temperature are achieved.
通带按钮，此按钮用来在VFO（可变频率震荡器）上选择10KHz，1KHz或100Hz的步长频率，当前所选择的步进，是在「频率显示」中的相关数字下面，用一条线显示出来。
SPAN button. This button is used to select either 10KHz, 1KHz, or 100Hz steps for the VFO. The currently selected step is indicated by a line under the relevant digit on the Frequency Display.
通带按钮，此按钮用来在VFO（可变频率震荡器）上选择10KHz，1KHz或100Hz的步长频率，当前所选择的步进，是在「频率显示」中的相关数字下面，用一条线显示出来。
SPAN button. This button is used to select either 10KHz, 1KHz, or 100Hz steps for the VFO. The currently selected step is indicated by a line under the relevant digit on the Frequency Display.
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