Dear madam and sir from Ettus team,
I am trying 1x2 mimo with X310 and 2 CBX120 boards by using UHD-master branch.
Namely I send from RF-A Tx/Rx to RF-A Rx2 as rx0 and RF-B Rx2 as rx1.
What I observe is that the rx0 signal's power is much larger than rx1 signal. I
refer to the schema and found out that the 2 switch before 2 antennas Tx/Rx and
Rx2 may cause 40 dB leakage. I am wondering am I right? I fix gains as
tx_gain=1.5, rx_adc_gain=6.0, rx_pga_gain=31.5
and tried 2 experimens:
1. RF-A Tx/Rx → 40 dB attenuation → power splitter to RF-A Rx2 and RF-B Rx2
2. RF-A Tx/Rx → 60 dB attenuation → power splitter to RF-A Rx2 and RF-B Rx2
The power of rx signals in dBm are:
rx0
rx1
40dB
28.88
16.65
60dB
27.97
3.41
I don't understand why when the external attenuation is 60 dB, rx1 is so much
influenced.
Could you give me some advice please?
Thank you in advance
Kasim
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