[Discuss-gnuradio] Testing flex2400

[Dan Halperin]

Hi,

Are there any good (standard) tests for the flex2400, or can anyone tell 
me what I'm doing wrong?

I tested the BasicRX and BasicTX boards by plugging a shielded wire 
between them, running usrp_oscope.py, and running the 
test_usrp_standard_tx script. Signal in, signal out - happiness, after I 
matched interpolation rates to eliminate overruns and set up  sufficient 
sampling frequencies.

I'm trying to test the flex2400 the same way - I stuck a wire from the 
TX/RX socket to the RX2 socket, ran usrp_oscope, and ran the standard tx 
script. Nothing. I've tried different frequencies, playing with the 
gain, and all kinds of other things, but I don't see any change in the 
signal.

A second question is: With the basic boards as described earlier, I run 
[usrp_fft.py -f 1M -d 32] and then run the signal generator 
[usrp_siggen.py -f 1M -i 32]. The spectrum I see has a small peak (but, 
at 0db) centered at 0 and then a large peak >50db near +0.1MHz. What is 
going on here?

Thanks,

-Dan