[USRP-users] Hardware modification to improve isolation on SBX

Matt Ettus matt at ettus.com
Fri Sep 6 18:30:47 EDT 2013


With the board as-is, the isolation between TX and RX is the sum of the
switch isolation of the TX/RX switch and the RX1/RX2 switch, which will
vary from about 35 to 60dB.  If you remove C31 and C93 you will have
completely cut the on-board path from TX to RX.  This should improve the
isolation, but it isn't going to become 90dB.  In both cases, however, the
over-the-air radiation between your TX and RX antennas will dominate the
amount of isolation you can achieve.


On Fri, Sep 6, 2013 at 1:47 PM, Tetzlaff, Thomas A <
thomas.a.tetzlaff at intel.com> wrote:

>  In January 2013, there was a thread titled “How to isolate the signal
> between TX/RX and RX2 on the USRP2 N210” in which a reference was made to a
> hardware modification on the SBX that can improve isolation.****
> I am experimenting with full duplex, same frequency operation and am very
> interested in this modification.  Could someone provide details on the
> modification?  How much does this increase the isolation?  Presumably, the
> mod will disable the ability to receive on the TX/RX antenna, which is
> fine.  The RF board is SBX board rev. 5.****
> ** **
> Regards,****
> Tom****
> ** **
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> USRP-users at lists.ettus.com
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