Hi Gonzalo,
the tune requests work exactly the same.
I'd point out that 400 kHz is a sampling rate that's simply very very low, and might not
work well on the N200, where the Master Clock Rate is a fixed 100 MHz, so the digital
signal from the 100 MHz ADC needs to get divided by 250, which isn't even divisible by 4.
Try a sampling rate of 2.5 MHz instead, and look whether things look nicer :)
Also note that 20 dB gain for the UBX and the B200 mean something very
different!
Best regards,
Marcus
On 07.07.22 22:36, Gonzalo Figueroa wrote:
Hello everyone!
I'm having problems trying to understand how tune_request works in the N200 model (ubx
daughterboard).
I've been working in the past with the B200 and I used to get rid of the LO using tune
requests. But doing the same with the N200 leads to a different behavior.
I have a B200 and N200 in the lab. So,to illustrate the problem I've made this
flowgraph:
flowgraph.png
Both USRPs are connected in loopback (TX/RX port with RX2 port).
Running this flograph with a B200 gives me this:
b200.png
And N200 this:
n200.png
When I run the same flowgraph without tune_request I obtain this:
*B200*
b200_no_offset.png
*N200*
n200_no_offset.png
Could you help me understand how tune_request works? And How to use it properly with the
N200?
Regards,
Fito.-
PS: Attached you will find the output of the command uhd_usrp_probe for both
USRPs.
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