[time-nuts] Ublox F9P multi-band GPS receiver

[Ole Petter Rønningen]

Indeed. Getting a *quality* antenna with that coverage will likely be a more costly affair than getting the actual receiver..

Of course, a cheap puck-style antenna is an option, but I am curious as to what improvements will actually be observed, at least for the time being - IIRC only about half of the sats transmit L2C..

Ole

> 21. jan. 2019 kl. 17:32 skrev Bob kb8tq <kb8tq at n1k.org>:
> 
> 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 <ke9h.graham at gmail.com> 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 <dmarquess at gmail.com> 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 <kb8tq at n1k.org> 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 <holrum at hotmail.com> 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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