Hey Arnold, What test frequency are you using to compare the received power at these two ports? I pulled up the schematic for the E310's daughterboard <https://files.ettus.com/schematics/e310/e310_db.pdf>, and took a look at the signal path for TRX (J4) vs RX (J3):
[image: image.png] For the RX path, your signal only passes through SW3, while the TRX path passes through SW3 & SW4. SW4 is a SKY13373_460LF <https://www.skyworksinc.com/-/media/SkyWorks/Documents/Products/601-700/SKY13373_460LF_201264N.pdf> which, at a test frequency of 4GHz-6GHz should have an isolation of ~22dB. This leads me to believe that SW4 is still configured for TX either due to a misunderstanding / misconfiguration of the RF paths on your end, or (less likely) an egregious bug on the UHD side. This is all a bit of a leap given the information provided in your OP, but I'd recommend you take a deeper look into your system's settings to make sure that you're configuring the RF paths appropriately. - Sam On Fri, Mar 12, 2021 at 8:47 AM z...@c3commsystems.com < z...@c3commsystems.com> wrote: > Hi, > > We are implementing a TDD system and using the TRX-A port in lab testing. > To facilitate TX/RX switch, we built control logic to control the GPIO pin > to flip SW1 on Page 7 of the published E310 daughter board schematics. > > What we noticed are: > 1. The RX ports cannot be cut off, so we must disconnect antenna if we > want to use TRX port only. > 2. The received signal power from TRX is about 22 dB less than that > received from the RX port, given the same TX power and testing > configuration. > > The above observations are consistent across multiple E310s between my > company and our collaborators. So we have the following questions. > > (Q1) Is this by design, or we might have missed something in our setup? > (Q2) If you think our design or setup may have problems, could you please > offer some suggestions? > > Thanks, > Arnold > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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