The WBX can put out about 20dBm at 520 MHz. -55dBm would be 75dB below the desired signal, which is quite a good amount of LO suppression. If you need more, you'll need to actively calibrate the DC offset to null it out.
Matt On 08/03/2010 12:55 PM, George Nychis wrote:
The power of the tone comes in to the spectrum analyzer at -55.6dBm On Tue, Aug 3, 2010 at 12:04 PM, Matt Ettus <m...@ettus.com <mailto:m...@ettus.com>> wrote: You are seeing uncompensated DC offset. What is the actual power of the tone? Matt On 08/03/2010 10:12 AM, George Nychis wrote: I have a WBX, and I've noticed that no matter what I transmit, the WBX always introduces a very narrow (but full-power) tone at the center of my spectrum. When the transmitter is disabled, the tone is not present. This can be seen below, where I'm transmitting a stream of complex(0,0), yet it still transmits this tone in at the center (520MHz): spectrum.jpg Has anyone experienced this before with the WBX board? I've confirmed it's only my WBX board by using the same USRP2 board and trying my RFX2400 and XCVR2450 with the same transmit script and sample stream and neither see this problem. I am using the latest USRP2 firmware that includes the WBX support, and the newest GR git. It's possible that the board is defective in some way... but I thought I'd punt it to the list to see if anyone else has seen the issue. - George _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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