[USRP-users] Questions about USRP2/WBX using UHD

Matt Ettus matt at ettus.com
Tue Nov 30 14:49:45 EST 2010

On 11/29/2010 04:46 AM, SERANT Damien wrote:
> Hi,
> I have some question about the utilization of the couple USP2/WBX:
> 1) I saw on the WBX schematics that it was possible to activate with a
> jumper, a 5V output to supply an antenna. Can you confirm me that and
> tell me where exactly on the dboard i have to plug this jumper ?
> 2) I'm trying to use 2 usrp2 in a mimo configuration, with the mimo
> cable and with only one ethernet cable. If i do that how the data will
> be organized in the received vector when i call the rcv() function?
> 3) I saw on the Gnuradio FAQ on USRP2 that "The Reference input can take
> a square or sine wave input that is DC-blocked and terminated in 50
> ohms". This means that the 10 MHz input is DC-blocked or that my 10 MHz
> signal has to be DC-blocked ? (In other terms : i'm using a GPS receiver
> that generate a square signal between 0 and 3.3 V, can i use it directly
> ?).

The input itself is DC-blocked, so you don't have to block it.


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