Re: [Discuss-gnuradio] Questions about WBX daugtherboard

[Matt Ettus]

On 03/25/2010 02:57 PM, Damien Serant wrote:
> Hi,
> I forgot to thank you for your answers. So... thank you !
> Concerning the spurs, they are peaks at precise frequencies. Their position
> and their strength depends on the LO frequency  (I observe peaks around 698
> MHz but not around 714 MHz as an example) but not on the decim rate. I
> observed also an attenuation around the central frequency when I use LO freq
> above 1 GHz. Note that the usrp2 is used without its top (i don't know if
> this precision has any importance)
> I'm not really clear and i can add prints screen if desired.


You are looking at frequencies in which there can be a lot of strong 
local signals.  They could be from TV, cellphones, 2 way radio, etc. 
The first step is to put the enclosure on, terminate with a 50 ohm 
terminator, and then report all the settings.

Matt