请问这是常见的还是ecal模块坏或vna需要校准？

校准后更换电缆肯定会导致不匹配问题。
还有其他变量（例如环境 - 温度和湿度以及物理 - 电缆弯曲）会影响校准有效的时间长度。
我个人也认为ENA使用的默认70 kHz IFBW太宽，通常将其降至3 kHz或以下。
您还需要注意校准后添加到系统中的其他适配器（或校准后移除），因为它们会导致不匹配条件发生变化，从而影响校准。
您可以考虑发布一些您正在看到的内容以及设置中正在发生变化的屏幕截图。



     以下为原文

  Changing cables after a calibration can definitely cause mismatch issues.  There are other variables (such as environmental - temperature and humidity and physical - cable flexure) that can effect the length of time that a calibration is valid.  I personally, also think that the default 70 kHz IFBW that the ENA uses is too wide and usually drop it down to or below 3 kHz.  You would also want to be careful with an additional adapters that are added to the system after calibration (or removed after calibration) as they can cause the mismatch conditions to change which will affect the calibration.

You might consider posting a couple screenshots of what you are seeing as well as what is changing in the setup.

我在原帖中不太清楚，这里有一个更好/更深入的解释。
我在4.9GHz到5.9GHz的频率范围内进行2端口ecal校准，然后保存状态，例如状态1.s11看起来很好，校准似乎工作，直到我改变状态并返回状态1，或者
更换电缆，然后返回到我校准的相同电缆，然后校准似乎关闭。
电缆长度为3英尺。
以前没有这种情况发生过。
校准可持续数小时或数天。
当我进行手动校准时，与使用ecal时相比，它似乎不那么频繁。
我会尽快上传一些图片。
试图确定它是ecal还是VNA。



     以下为原文

  I wasn't very clear in my original post, here is a little better/further explanation.  I do a 2port ecal calibration on the frequency range 4.9GHz to 5.9GHz and then save the state for example in state 1.  The s11 looks fine and the calibration seems to work until I either change the state and go back to state 1,or change a cable and then go back to the same cable I calibrated on then the calibration seems to be off.  The cables are 3ft in length FYI.  This used to not happen before.  The calibration can last for hours or days.  It seems to be less frequent when I do a manual calibration than when I use the ecal.  I will try to get some pictures uploaded soon.  Trying to determine if its the ecal or VNA.