[USRP-users] X310 Power before Transmit

Marcus D Leech patchvonbraun at gmail.com
Mon Feb 25 10:44:03 EST 2019


I’m confused. There is no AD9361 on the X310. 

Sent from my iPhone

> On Feb 25, 2019, at 10:02 AM, Alexander Olihovik via USRP-users <usrp-users at lists.ettus.com> wrote:
> 
> Hi all,
> 
> I modified the X310's FPGA to toggle a GPIO pin immediately once it sees TX data, and delay the TX data by a fixed number of samples. Using an oscilloscope, I found that everything works as expected, but there is an initial spike of RF power that precedes the GPIO trigger and the RF signal. Has anyone else experienced this? Is there anything I can set my GPIO trigger on to start before the power spike? I also tried triggering the GPIO pin on DAC_ENABLE, but it seems this signal goes high and stays high once the AD9361 is initialized, and not only when the DAC is about to push out data. 
> 
> Best regards,
> Alex
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