Thanks for your reply. I dont have a dummy load in hand. Are there any other ways to check that?
On Sat, Feb 9, 2013 at 2:35 AM, Ralph A. Schmid, dk5ras <ra...@schmid.xxx> wrote: > 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: discuss-gnuradio-bounces+ralph=schmid....@gnu.org >> [mailto:discuss-gnuradio-bounces+ralph=schmid....@gnu.org] On Behalf Of >> gang li >> Sent: Friday, 08 February, 2013 23:47 >> To: Marcus D. Leech >> Cc: usrp-us...@lists.ettus.com; discuss-gnuradio@gnu.org >> 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 <mle...@ripnet.com> >> 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 >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
