嗨史蒂夫，
是的，4500美元就是你今天为整套仪器支付的价格。
我很幸运，在ebay买了我的“新”开关，价格为300美元（当我拿到仪器时，老开关已经死了）。
通常价格是大约两倍或更多，没有保修。
如果您真的需要在10-30 kHz的全功率下进行测量，您可以尝试使用早期VNA型号中的同轴继电器。
在8753D中有一个设置可以关闭连续切换，如果您尝试继电器则应该使用该设置，否则它将很快自行消失。
我当时并不知道U9397A，但它似乎是一个不错的选择。
HP /安捷伦曾经有过非常慷慨的规格，所以如果他们说最低300 kHz，它很可能会低于这个。
损失将是更低的功率和更低的动态范围/精度（更多的插入损耗和更差的回波损耗），但在校准包括开关在内的设置时，仍然可以测量至少低至100 kHz。
http://cp.literature.agilent.com/litweb/pdf/5989-7618EN.pdf
最便宜的替代方案（以及验证损坏的开关）是连接同轴电缆以绕过损坏的开关并终止另一条路径，但是您只能通过传统的DUT反转来测量S21和S11或S12和S22。
祝你好运，
博
以上来自于谷歌翻译
以下为原文
Hi Steve,
Yes, at $4500 it is about the price you pay today for the full instrument.
I was lucky and got my "new" switch at ebay for $300 (old switch dead when I got the instrument). Typically the price is about double or more and no warranty.
If you really need to measure with full power at 10-30 kHz you could try with a coaxial relay like in the earlier VNA models.
There is a setting in 8753D to turn off continuous switching that you should use if you try the relay or it will quickly destroy itself.
I was not aware of the U9397A at the time but it seems to be a good alternative. HP/Agilent used to have quite generous specs so if they say min 300 kHz it will most likely work well below that. The penalty will be lower power and lower dynamic range / accuracy (more insertion loss and worse return loss) but still possible to measure at least down to 100 kHz as you calibrate your setup including the switch.
http://cp.literature.agilent.com/litweb/pdf/5989-7618EN.pdf
The cheapest alternative (and to verify the broken switch) is to connect a coax to bypass the broken switch and terminate the other path, but then you can only measure S21 and S11 or S12 and S22 by traditional DUT reversal.
Good luck,
Bo
嗨史蒂夫，
是的，4500美元就是你今天为整套仪器支付的价格。
我很幸运，在ebay买了我的“新”开关，价格为300美元（当我拿到仪器时，老开关已经死了）。
通常价格是大约两倍或更多，没有保修。
如果您真的需要在10-30 kHz的全功率下进行测量，您可以尝试使用早期VNA型号中的同轴继电器。
在8753D中有一个设置可以关闭连续切换，如果您尝试继电器则应该使用该设置，否则它将很快自行消失。
我当时并不知道U9397A，但它似乎是一个不错的选择。
HP /安捷伦曾经有过非常慷慨的规格，所以如果他们说最低300 kHz，它很可能会低于这个。
损失将是更低的功率和更低的动态范围/精度（更多的插入损耗和更差的回波损耗），但在校准包括开关在内的设置时，仍然可以测量至少低至100 kHz。
http://cp.literature.agilent.com/litweb/pdf/5989-7618EN.pdf
最便宜的替代方案（以及验证损坏的开关）是连接同轴电缆以绕过损坏的开关并终止另一条路径，但是您只能通过传统的DUT反转来测量S21和S11或S12和S22。
祝你好运，
博
以上来自于谷歌翻译
以下为原文
Hi Steve,
Yes, at $4500 it is about the price you pay today for the full instrument.
I was lucky and got my "new" switch at ebay for $300 (old switch dead when I got the instrument). Typically the price is about double or more and no warranty.
If you really need to measure with full power at 10-30 kHz you could try with a coaxial relay like in the earlier VNA models.
There is a setting in 8753D to turn off continuous switching that you should use if you try the relay or it will quickly destroy itself.
I was not aware of the U9397A at the time but it seems to be a good alternative. HP/Agilent used to have quite generous specs so if they say min 300 kHz it will most likely work well below that. The penalty will be lower power and lower dynamic range / accuracy (more insertion loss and worse return loss) but still possible to measure at least down to 100 kHz as you calibrate your setup including the switch.
http://cp.literature.agilent.com/litweb/pdf/5989-7618EN.pdf
The cheapest alternative (and to verify the broken switch) is to connect a coax to bypass the broken switch and terminate the other path, but then you can only measure S21 and S11 or S12 and S22 by traditional DUT reversal.
Good luck,
Bo
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