The X series and B series use the LC_XO series GPSDO modules Jackson Labs.
I’d look through the specs for those modules for any Current limits. I’m literally underground in Toronto right now or I’d stuff those documents myself. Sent from my iPhone > On Dec 14, 2021, at 3:42 PM, Temir Karakurum <temirkaraku...@gmail.com> wrote: > > > 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 > _______________________________________________ > 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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