Hi again, Thanks for pointing me to the schematic. I guess my final question is why Ettus' official store recommends different antennas for different USRP series. For instance; datasheet of 3V GPS antenna ( https://www.ettus.com/wp-content/uploads/2019/01/Trimble_GPS_Antenna_DS.pdf) for N-series (as well E310) states that it is compatible with 3 or 5 V supply (15 mA typ. for 3V and 30 mA max for 5V). However, the store webpage (https://www.ettus.com/all-products/gps-ant-3v/) states that this antenna* is not* compatible with X and B series. Marcus Leech's previous reply states that X and B bias-T's provide 5V supply so I am kind of confused regarding the compatibility problem. Is it due to some current threshold? If so, where can I find the specs regarding the aforementioned limits?
All the best, Temir On Tue, Dec 14, 2021 at 9:51 PM Marcus Müller <marcus.muel...@ettus.com> wrote: > Dear Temir, > > https://files.ettus.com/schematics/e310/ , the daughterboard schematic > (e310_db.pdf), page > 7: no, there's no biasing on the RF ports. > > Best regards, > > Marcus > > DISCLAIMER: Any attached Code is provided As Is. It has not been tested or > validated as a product, for use in a deployed application or system, or for > use in hazardous environments. You assume all risks for use of the Code. > Use of the Code is subject to terms of the licenses to the UHD or RFNoC > code with which the Code is used. Standard licenses to UHD and RFNoC can be > found at https://www.ettus.com/sdr-software/licenses/. > > NI will only perform services based on its understanding and condition > that the goods or services (i) are not for the use in the production or > development of any item produced, purchased, or ordered by any entity with > a footnote 1 designation in the license requirement column of Supplement > No. 4 to Part 744, U.S. Export Administration Regulations and (ii) such a > company is not a party to the transaction. If our understanding is > incorrect, please notify us immediately because a specific authorization > may be required from the U.S. Commerce Department before the transaction > may proceed further. > > On 14.12.21 18:22, Temir Karakurum wrote: > > Hi Marcus, > > > > Thanks for the quick reply! Is the bias-tee available only for the GPS > port? > > Can you similarly provide DC power to an LNA through the RF ports? > > > > Best, > > Temir > > > > On Tue, Dec 14, 2021 at 8:17 PM Marcus D. Leech <patchvonbr...@gmail.com> > wrote: > > > > On 2021-12-14 12:12, Temir Karakurum wrote: > >> Hi there, > >> > >> A few months ago I ended up with a pair of USRP E312's and u-blox > ANN-MB-00 GPS > >> antennas. I was able to synchronize both devices and acquire > properly aligned > >> samples and things are looking good. > >> > >> However, today I realized that the u-blox antenna I have is an > active antenna and > >> checking its datasheet it looks like it requires 15 mA/3-5 V DC > supply for the > >> integrated LNA. Does this mean that the GPS port of 312 has a > bias-tee that > >> supplies the necessary currents? If there is a bias-tee, where can > I find > >> information about it? > >> > >> Also checking the Ettus store, it looks like different antennas are > compatible with > >> different USRP models. For instance "3V Active GPS Antenna for N > series" is > >> apparently compatible with E310 both not compatible with X and B > series. Which > >> factor determines the compatibility? > >> > >> Best regards, > >> Temir > >> > >> _______________________________________________ > >> USRP-users mailing list --usrp-users@lists.ettus.com > >> To unsubscribe send an email tousrp-users-le...@lists.ettus.com > > I think the bias-T on both X and B series puts out +5V. MOST GPS > antennas are > > perfectly happy to deal with anywhere between 3-5V. > > > > Nearly all GPS antennas these days are *active* antennas and MOST > are 3-5V happy. > > > > > > _______________________________________________ > > USRP-users mailing list -- usrp-users@lists.ettus.com > > To unsubscribe send an email to usrp-users-le...@lists.ettus.com > > > > > > _______________________________________________ > > 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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