Dear
Madam/Sir,
Recently, I had encountered a problem that was the
synchronization of signal between the four channels of
USRP N310. For sloving this problem, I used to the mode
of external local oscillator (LO) of N310. As this
article says (
https://kb.ettus.com/N300/N310),
a power divider was used to LO inputting signal into two
channels. The amplitude of two channels of LO input was
about 3dBm. The LO input frequency was twice the
frequency of the desired RF output frequency. Then,
the
system was switched to the mode of external LO in the
GNU Radio software.
However, no signal was be output except noise,as
shown in figure 1. The figure 2 was the output signal
in the modle of internal LO. Plesee help me to slove
this problem!
Best
regards,
Damon