I am experiencing something strange with USRP1 and already tried a lot of approaches to diagnose where the problem is, but no luck so far.
We have two USRP1, each of which has a RXF 2400 daughter board and
an antenna connected to the Tx/Rx port. When we run benchmark (benchmark_tx.py and benchmark_rx.py), the
packet loss/corrupted rate is very random (from 0% to 99%).
We've tried
several approaches to diagnose where the problem, including (1) connect the Tx/Rx ports of two USRP by a SMA connector (2) try both sides of
the mother board (A and B) , (3) use different central frequency from 2.4G
to 2.48G, (4) adjust the carrier threshold (20 to 50), tx amplitude (0 to
1) and rx gain (0 to 90), (5) place the radios in different locations, (6) use different versions of gnuradio (stable release version 3.3.0 as well as the latest repository code) (7) place a fft sink at the rx to observe the spectrum, I can see the signal spectrum showing up when tx is transmitting something.
Unfortunately, nothing really helps.
Is it possible that it is a defective USRP?
I really appreciate if anyone of you could guide me with this problem because I have a deadline to make in around 2.5 weeks.