8569B可能的低频扩展？

您可以使用它稍低，但频率漂移和稳定性约为50 KHz /小时和混频器杂散噪声。
它不是设计得那么低。
如果需要测量较低频率，可以根据测量要求使用其他产品。
您可以发布它，并查看您的选择以适应您的预算。
戴夫



     以下为原文

  You could use it a little lower but the frequency drifting and stability is about 50 KHz/hour and mixer spurious noises.   It was not designed to go that low.   If you need to measure lower frequencies, you can use another product based on your measurement requirements.   You could post it, and see your choices to fit your budget.

Dave

使用双平衡混频器和带通滤波器将LO（+隔离器）的输入信号上变频或使用Ailtech 757原理：HP OEM梳状发生器通过定向耦合器与增强型（需要放大器）LO和重带通滤波器混合使用
选择频段（例如（400 -500Mhz，100Mhz梳子）1Mhz将是501 ...如果您有选择??梳子发生器，它很容易在内部实施，只需稍作修改。



     以下为原文

  Upconvert the incoming signal with the LO (+ isolator) with a double balanced mixer plus band pass filtering or use the Ailtech 757 principe: HP OEM comb generator mixed trough a directional coupler with the boosted (amplifier needed) LO and heavy bandpass filtering of the choosen band (for example (400 -500Mhz with a 100Mhz comb) 1Mhz will be 501... If you have the option ?? comb generator it is easy to implement inside with minor modifications.