60 dB is a lot of attenuation. You can remove *one* of the 30 dB
attenuators. For gain settings, 30 is good for RX and 50 to 60 is good
for TX.
Ron
On 6/12/20 14:14, Thuc TheGifted via USRP-users wrote:
Hi everyone,
I am new to this USRP B200 board. I currently have two boards and I
want to connect the Tx port of one board to the Rx port of another
using a SMA cable to visualize the communication.
So I start with something available online here
https://www.mathworks.com/help/supportpkg/usrpradio/examples/qpsk-transmitter-with-usrp-r-hardware.html
and
https://www.mathworks.com/help/supportpkg/usrpradio/examples/qpsk-receiver-with-usrp-r-hardware.html
Basically, my hardware connection is
Computer_1 + B200_1(Tx port) + 30 dB attenuator + SMA cable + 30 dB
attenuator + B200_2(Rx port) + Computer_2
And I run the transmitter code on the computer_1 and run the receiver
code on the computer_2. The transmitter light and the receiver light
both turns on, so I think they are doing something.
However the result I get on my receiver end on computer_2 is not good.
They just look like noise.
I think because I use a different kind of board, so I need to modify
the gain parameters in the code. But I have no idea about how to make
it correctly.
I hope someone with more experience with this board can show me how to
do it right.
Could you please help me on this.
Thank you.
-Ves
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