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

[MLewis]

Like these?
http://www.tallysman.com/index.php/gnss/products/antennas-triple-band/

On 21/01/2019 12:33 PM, Bob kb8tq wrote:
> Hi
>
> To be more precise, what you want is a L1/L2/L5 triple band antenna.
>
> Bob
>
>> On Jan 21, 2019, at 11:32 AM, Bob kb8tq <kb8tq at n1k.org> 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 <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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>>>>>
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