关于频率转换器件S参数的问题

你是对的。
BUC和LNB的增益，增益纹波，相位，群延迟，压缩测量均基于SC21和SC12测量。
混频器的SC21测量基本上是测量输入频率（R接收器）的输入信号，输出频率的输出信号（B接收器），SC21是B / R.
使用N5230C进行混频器测量，我猜一个标准的S参数通道用于测量R接收器的输入信号（将接收器调谐到输入频率），第二个标准通道用于通过频率偏移模式测量输出信号
打开（将接收器调到输出频率）。
在每个频率下，可以通过扫描输入功率并监测与线性增益相比的增益变化来进行增益压缩测量。



     以下为原文

  You're correct. The Gain, Gain Ripple, Phase,Group Delay,Compression measurements of your BUC and LNB are all based on the SC21 and SC12 meaurements.

The SC21 measurement of a mixer is esentially measuring the input signal at input frequency (R receiver), and the output signal at output frequency (B receiver), and SC21 is B/R. Using N5230C for mixer measurement, I would guess a standard S-parameter channel is used to measure the input signal with R receiver (tuning the receiver to input frequency), and a second standard channel is used to measure the output signal with Frequency Offset Mode turned on (tuning the receiver to the output frequency).

At each frequency, the Gain compression measurement can be made by sweeping the input power and monitoring the gain change compared to linear gain.

嗨，谢谢你的回复和澄清。
坎瓦尔。



     以下为原文

  Hi,
 
   Thanks for the reply and the clarification.

Kanwal.

我们制造了一个特定的产品，PNA选项083，用于直接测试卫星上下转换器，并由许多（可能是大多数）compainies用于转换器测试。
它比您使用的PNA-L贵一点，但测试配置和校准非常简单，可以为您节省大量时间和麻烦。
具体应用称为“SMC + phase”或“Scalar Mixer Cal plus Phase”。



     以下为原文

  We make a specific product, PNA with option 083 which is designed to test satellite up and down converters directly and use by many (maybe most) compainies doing converter test.  It is a little more expensive than the PNA-L you are using, but the tests are very simple to configure and calibrate and can save you a lot of time and trouble.  The specific applications is call "SMC+phase" or "Scalar Mixer Cal plus Phase".

感谢Joel博士，我已经下载了应用笔记，+改进了频率转换设备的网络分析仪测量+，以了解有关测试FTD的更多信息。



     以下为原文

  Thank you Dr_joel ,

                            I have downlaoded the app note, +Improving Network Analyzer Measurements of Frequency-Translating Devices+ to learn more about testing FTD's.

我们刚刚收到N5242A -200，-219，-224，-080，-083，-029，-084，-087，-086，这意味着我是新手，所以我需要一些提示来采取NF
Ku LNB的一部分。
我已经使用同轴端口校准，但Ku LNB具有波导输入和同轴输出。
如何考虑波导/同轴适配器？
如何避免通过校准？



     以下为原文

  We've just received a N5242A -200, -219, -224, -080, -083, -029, -084, -087, -086, which means I'm a newbie, so I need some hints to take NF of a Ku LNB.
I already did using coax ports calibration, but Ku LNB has a waveguide input and a coax output.
How can I take into account the waveguide/coax adapter?
How can I avoid the through calibration?

有两种方法可以解决这个问题。
最简单的方法是在同轴电缆中校准然后去嵌入波导适配器。
您可以使用Cal Plane Manager来表征波导适配器（CPM，它用于将校准平面从适配器的一侧移动到另一侧，等等）。
要用它来表征波导适配器，你需要一个波导校准套件。
然后你用同轴电缆做1端口校准。
将其另存为用户校准集。
添加波导适配器，在波导中进行1端口校准（或添加一对波导适配器并在波导中执行像TRL一样的2端口校准）并保存。
然后使用CPM来表征适配器并保存coax-to-WG适配器S2P文件。
然后在同轴电缆中进行NF校准，添加WG适配器，并使用CPM从校准集中去嵌入WG适配器......或者您可以使用校准菜单下的“固定”功能将其从
通道（类似于CPM，但你不会以这种方式获得新的calset）。
另一种方式还需要一个WG calkit：只需进行NF校准并将WG放入一个端口的正确连接器位置并另一个端口同轴，并且校准向导将自动生成一组额外的步骤，这些步骤将解嵌适配器
。
在校准向导中，它将提示您使用噪声源或功率计并将其连接到端口。
如果是WG端口，则必须将功率计标记为具有不同的连接器，然后选中不忽略功率计适配器的框，它将生成一组额外的校准步骤，并添加1
在功率计（或噪声源）连接平面上同轴的端口cal，加上另一个端口的WG cal和同轴电缆。
如果它到达“将port1连接到端口2”的步骤，那么只需移除波导适配器（cal也将正确测量它并做正确的事情）。
因此，您无需通过校准来执行工作组。
顺便说一句，我想你应该收到一张PNX-X启动协助1天的优惠券，所以请当地的AE告诉你如何做到这一点。
如果您遇到任何麻烦，请回复我们，我们将通过它。
我们已经花了很多时间与WG进行哄骗，并且能够以这种方式进行非常好的测量。
哦，如果你确实得到了启动协助，那么在他来之前，请他为你提供30天临时许可证090：频谱分析仪选项。
我想你会喜欢它！



     以下为原文

  There are two ways to handle this. 

The simplest way is to calibrate in Coax and then De-embed the waveguide adapter.

You can characterize the waveguide adapter using the Cal Plane Manager (CPM, it is used to move calibration planes from one side of an adapter to another, among other things).  To use it to characterize the waveguide adapter, you do need a waveguide cal-kit.

Then you do a 1 port cal in coax.  Save it as a user cal set. Add the waveguide adapter, do a 1 port cal in waveguide (or add a pair of waveguide adapters and do a 2 port cal like TRL in waveguide) and save it.  Then  use the CPM to characterize the adapter and save the coax-to-WG adapter S2P file.

Then do your NF calibration in coax, add the WG adapter, and the use CPM to de-embed the WG adapter from the calset...or you can use the "fixturing" function under the calibration menu to de-embed it from the channel (similar to CPM, but you don't get a new calset this way).



The other way also requires a WG calkit:  Just do the NF calibration and put WG into the proper connecter spot for one port and coax for the other, and the cal wizard will automatically generate an extra set of steps that will de-embed the adapter.  In the calibration wizard it will prompt you to use the Noise source or power meter and connect it to a port.  If it is the WG port you have to mark the power meter as having a different connector, and then check the box that says don't ignore the power meter adapter, and it will generate an additional set of calibration steps that does an added 1 port cal in coax at the power meter (or noise source) connection plane, plus the WG cal and the coax cal at the other port.  IF it gets to a step that says "connect port1 to port 2" then just remove the waveguide adapter (the cal will properly measure this as well and do the right thing).

So you never have to do a WG through calibration.

BTW, I think you should have received a voucher for 1 day startup assist with the PNX-X so ask the local AE to show you how to do this.  If you have any trouble at all post me back and we'll work through it.  We've done this lots of time with WG to coax and can make very good measurements in just this way.

Oh, and if you do get the startup assistance, before he comes, ask him to get for you a 30 day temporary license for 090: spectrum analyzer option. I think you'll like it!