On 04/06/2018 05:14 PM, Rob Kossler via USRP-users wrote:
Hi,
Are there any examples for using the N310 with external LO? I have
gotten some strange results (strange spectral mirror-ing) when using
as just a 4 channel receiver. I am using the "args" argument to set
rx_lo_source, but my code is setting the individual channel
frequencies as I do for other USRPs and I noticed various warnings in
the terminal window for each channel that I tune.
On a separate note, I get some strange results if I set the
clock_source to external in the args (using with OctoClock). If I
leave it internal, no problem. For now, I am leaving it internal until
I can solve the problem above with LO source.
Rob
Rob, just shooting from the hip here, since I haven't "lived" with an
N310 yet...
Have you tried adjusting the LO levels let's say 2dB in either direction
to see if that changes the imaging behavior? Also, remember that the
external LO input
on the N310 must be a 2XLO -- at twice the desired Fc, and only up to
8GHz (giving a 4GHz antenna frequency).
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