Just put 50 Ohm dummy loads onto the connectors and check for a signal, then you see if it is leakage or not :)
Ralph. > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > gang li > Sent: Friday, 08 February, 2013 23:47 > To: Marcus D. Leech > Cc: [email protected]; [email protected] > Subject: Re: [Discuss-gnuradio] SBX TX/RX RX leakage > > Yes. I am doing full duplex on the same frequency, transmitting from > TX/RX and receiving on RX2 at the same time. When I put the antennas > far way from each other, the received signal amplitude is very low. > And when I change the distance between them, i found the received > signal amplitude is kind of stable. So i think maybe the leakage takes > the major. Am I right? > > On Fri, Feb 8, 2013 at 4:26 PM, Marcus D. Leech <[email protected]> > wrote: > > On 02/08/2013 04:10 PM, gang li wrote: > >> > >> When the signal received on RF2 port has a very weak strength, the > >> energy leaked from TX to RX will dominate in the total received > >> energy. I have observed this in my experiments. Are there any ways to > >> measure the leaked signal so i can compensate it? I am thinking a way > >> of by connecting the RF1 and RF2 ports with a long cable and 60db > >> attenuators. And then i record the received signal. I assume it is the > >> leaked signal from TX. Are there any better ways? Thanks for your > >> reply. > >> > >> Best, > >> Gang > > > > Are you TX/RX on the same frequency, or different frequencies? > > > > The usual way to deal with this on different-frequency setups is to use a > > duplexor, or a deep notch filter on the RX port, and probably boost your > > antenna signal a bit with an external amplifier. > > > > But if this is *same-frequency* duplex, the on-board leakage is really minor > > compared to the coupling between your antennae. > > > > > > > > -- > > Marcus Leech > > Principal Investigator > > Shirleys Bay Radio Astronomy Consortium > > http://www.sbrac.org > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
