Per the integration guide
(https://www.u-blox.com/sites/default/files/ZED-F9P_IntegrationManual_%28UBX-18010802%29.pdf),
the recommended antenna should be between 30dB and 40dB of gain.
Additional note: ublox is releasing an eval board (p/n C099-F9P) which
is similar to the sparkfun board, except a less annoying form factor
(can work as a standalone thing, or fit on an arduino), additional
interface options (wifi and bluetooth, pretty useful if you're doing
RTK), less annoying connectors (SMA), and ships with the ublox
multi-band antenna ... all for $50 more than the sparkfun, according to
digi-key. They're not available yet, but I imagine the will be soon. See
https://www.u-blox.com/en/product/c099-f9p-application-board#tab-documentation-resources
for more details.
On a vaguely related note, I wonder if it would be possible to retrofit
something like a AE6RV GPSDO with one of these. The footprint is pretty
different (and there's a big pile of ground/thermal connections on the
bottom of the new chip), but it seems like the actual electrical
interface is probably the same in the important ways, so it might be
possible to make an adapter board, maybe...
-j
On 1/21/19 8:32 AM, Bob kb8tq wrote:
Hi
Based on the F9P data sheet, you will need an L1 / L2 antenna that is wide
enough
to get the Galileo E5B as well as the Glonass L1OF and L2OF bands. The gotcha
is that (so far) I have not found a gain number for the target antenna. As we
have
found on other modules, you do want to get the right gain. L1/L2 antennas range
from 50+ db down to below 30 db. Simply tacking a pad on a 50 db antenna is not
the best way to do things if you are in an urban area.
There also is the issue of powering the antenna. It is not clear what sort of
antenna
bias circuit the SparkFun module has on it. If it simply is using the module’s
bias setup
that also could be an issue. Max Vcc on the module is 3.6V. The VCC_RF pin can
have
main Vcc - 0.1V max on it. If that *really* means that 3.3V is about it for
antenna bias,
that eliminates roughly 100% of all the used antennas out there. It also
eliminates a
number of the new ones.
If you put in an external bias setup, there are a lot of antennas to pick from
on eBay.
They come and go. The used stuff generally will be 12V powered. It also is
likely
to have a pretty good data sheet on it. The new stuff from China seems to be
sold
by a variety of people who pop up for a while and then go away for a while.
Making
sure of what you are getting is a bit tough as a result. There are extensive
stories
in the archives …..
Bob
On Jan 21, 2019, at 10:21 AM, Graham / KE9H <[email protected]> wrote:
What kind of antenna is needed to simultaneously hear all of the systems at
once?
My PCTel GPS antenna has a filter that limits it to only the US GPS system.
--- Graham
==
On Mon, Jan 21, 2019 at 4:01 AM Dustin Marquess <[email protected]> wrote:
If DigiKey's pricing is accurate, the ZED-F9T is $13.89 more than a
ZED-F9P. I would have gladly paid $14 more for a version of the
SparkFun board using the T(iming) version instead :(.
On Mon, Jan 21, 2019 at 12:10 AM Bob kb8tq <[email protected]> wrote:
Hi
From a *very* quick read of the doc’s:
1) The device *does* have a position hold capability
2) There is some level of data on the time pulse. It it only 1 ns
resolution?
3) It does appear to support Galileo and Glonas in addition to GPS.
4) It is clearly multi-band for GPS. It is unclear from a quick read if
it is multi-band for the other systems.
5) If you get one, make sure you have the RF cable connector it needs.
6) I have not (yet) found a recommendation for the antenna gain.
Again, all from a quick read ….
Bob
On Jan 20, 2019, at 5:42 PM, Mark Sims <[email protected]> wrote:
Sparkfun is now selling the Ublox F9P L1/L2 GPS receiver module on a
board ($219). The F9P supports GPS/Galileo/Glonass/Beidou and tracks L1/L2
data. It outputs carrier phase data and has survey-in and fixed position
support along with RTK support (10 mm accuracy). Looks like the F9P has 1
time pulse output.
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