Re: [Discuss-gnuradio] USRP N200 + SBX - problem receiving signal

[Josh Blum]

On 11/11/2011 07:37 AM, Urban Kuhar wrote:
> Hello!
> 
> I've recenty got two USRP N200 with SBX daughter boards. I have managed to
> transmit simple sine signal with one USRP but I have problems receiving

Does that mean you have confirmed transmission with a spectrum analyzer?

> this signal. I dont see anything but noise in spectrum. I have measured
> signal that I am transmiting with spectrum analyzer and I see a spike in
> spectrum, so the transmiter must be working.
> 
> I am using UHD source and sink blocks as a "top layer" for USRP devices,
> and WX GUI FFT block for displaying spectrum. Sine frequency is 1kHz and I
> am samping with 200kHz. I have set the center frequency on 500MHz. I have
> tried both antenna ports on receiving device.
> 
> Is there some setting that I am missing?

Can you tell more information, or send your GRC flowgraph?
What frequency, what digital amplitude, gains, etc...

If I can make some suggestions:

* Digital amplitude should be max magnitude 1.0, start with something
way lower like 0.3.

* Use a larger sample rate, at least 1Msps. This can make it easier to
debug.

* Did you pick the correct RX antenna?

* Have you tried increasing RX gain?

-Josh