[USRP-users] Spurious signals from packet loss??

Eleftherios(Lef) Kampianakis e.kampianakis.ee at ieee.org
Fri Oct 31 00:54:39 EDT 2014


Hello,

I have developed a python script to receive from both channels of the B210
simultaneously  and with a constant phase delay in every session
(attached). My transmitter (TX/RX2) is connected to a 30dB attenuator and a
0 phase splitter that sends the signal to RX1 and RX2. Using this topology
and the attached grc script I can receive whatever the TX is transmitting.
Using just GRC with scope and FFT sink I can see my signals ok without much
noise in most cases. However, when I use only python script to  implement
vector sinks I have a lot of problems:


1) When I use an MCLK > 10e6 my the TX channel is not working, I am not
receiving anything
2) I get alot of spurious signals (attached photos)
3) I cann't (dont know how) to set up the usrp to transmit only a specific
number of samples and the rx to receive the same number of samples too
4) I get a lot of LOU (see attached)

Any suggestions for any of the 3 subjects?

Thank you in advance.
Lef
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