Re: [Discuss-gnuradio] phase noise of RFX900 daughter board

[Pengyu Zhang]

Hi Matt,

We are running a RFID program. The source code of the program can be downloaded here:

https://github.com/pengyuzhang/QuarkNet/tree/master/usrp_reader

We measure the phase noise using the TX/RX and RX2 on the same daughter board. The python program which configures the daughter board can be seen here.

https://github.com/pengyuzhang/QuarkNet/blob/master/usrp_reader/apps/WISP_reader.py

Pengyu

On Mon, Feb 10, 2014 at 5:37 PM, Matt Ettus <address@hidden> wrote:

I think you may be measuring some other artifacts and not actual phase noise.  Can you send me the program you used to measure this?  In any case, the WBX and SBX daughterboards have much lower phase noise than RFX900, and the newer motherboard also will have lower phase noise.

Matt

On Mon, Feb 10, 2014 at 2:18 PM, Pengyu Zhang <address@hidden> wrote:

Hi,

We have tried to measure the phase noise of RFX900 daughter board when the daughter board is mounted on a USRP 1 mother board. When we directly connect the TX/RX port to the RX2 port through a 46dB attenuation signal, we still observe significant amount of phase noise as shown in the attached figures. Those figures suggest that the phase noise is about 8 degrees which cannot be tolerated by many communication systems. Would be great if you guys can provide some suggestions on reducing the phase of the USRP platform.

Pengyu

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