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
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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
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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.
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