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

Mon Jan 21 23:05:22 UTC 2019

Hi

Here’s an ad for a somewhat different antenna with some barely readable bandwidth testing data:

https://www.aliexpress.com/item/RTK-system-HIGH-GAIN-GNSS-antennas-GPS-Glonass-Galileo-Bei-Dou-High-Precision-waterproof-survey-antenna/32826409839.html?aff_platform=promotion&cpt=1548110255481&sk=i6Ujaqn&aff_trace_key=b8dab77ba20845429ffa1fc31fd6d51f-1548110255481-09708-i6Ujaqn&terminal_id=2cf8f236a50d4cd79c67cb1d789ca57c <https://www.aliexpress.com/item/RTK-system-HIGH-GAIN-GNSS-antennas-GPS-Glonass-Galileo-Bei-Dou-High-Precision-waterproof-survey-antenna/32826409839.html?aff_platform=promotion&cpt=1548110255481&sk=i6Ujaqn&aff_trace_key=b8dab77ba20845429ffa1fc31fd6d51f-1548110255481-09708-i6Ujaqn&terminal_id=2cf8f236a50d4cd79c67cb1d789ca57c>

The antenna also shows up on other sites from time to time. It appears to run off of 3.3V it’s a bit more expensive than the first one. It’s still about 1/10th  
the price of some of the non-Chinese sourced products. 

The data in this ad

https://www.aliexpress.com/store/product/New-RTK-system-GNSS-antennaS-GPS-Glonass-Beidou-High-Precision-waterproof-survey-antenna-HIGH-GAIN-support/1920594_32805500077.html?spm=2114.12010612.8148356.60.2d4f6261ui9nrX <https://www.aliexpress.com/store/product/New-RTK-system-GNSS-antennaS-GPS-Glonass-Beidou-High-Precision-waterproof-survey-antenna-HIGH-GAIN-support/1920594_32805500077.html?spm=2114.12010612.8148356.60.2d4f6261ui9nrX>

That *might* apply to the first one I mentioned (or might not …) suggests that this one may be a better bet for E5. 

Again, no experience with the seller. No idea what antenna you actually will get. The world may end tomorrow :) 

Bob

> On Jan 21, 2019, at 2:44 PM, MLewis <mlewis000 at rogers.com> wrote:
> 
> 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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