On 01/03/2023 09:30, [email protected] wrote:
I don’t understand how this happen. Everythings are same, I just
change USRP.
First, I tried with USRP B200 and the difference between 0 and 180
degree is 3dB.
Then I plug Pico VNA, the difference is zero. Then I plug Nano VNA
(It’s 50 dollar VNA cheap.) the difference is zero.
I plug my other USRP, It’s B210. The difference is 0,7dB.
Anything changed except USRP.
After of all this I plug USRP B200 again and the difference is 3dB.
When I change the frequency, at some frequencies there is no
difference between 0 and 180 degree. I share with you the data. When
horn antenna at 0 degree ant rotate 180 degree.
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How far apart are the horns? What are you TX and RX gain settings?
Do you have a laboratory signal generator you can use to verify
linearity of the receivers?
Can you share the code you're using to take these measurements?
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