Hello

I open this thread because the other one was used to talk about something else, so I changed the title to the old discussion.

@iFly4rotors


give me these advices:

"what gps model i have to buy ?


       Personally, I like the Matek brand the best. I have used it a lot and it is extremely reliable, however, it is costly.
       I have the M8Q-5883 on many of my quads. I think the TBS might also be good, but have no experience with it.
       The iFlight M8Q-5883 might also be ok, but again, I have not used it.

and also difficult is to find a perfect 3d printer mount for it for eachine wizard x220 v2, do you have a model ?

      You can buy GPS mounts or make one. I have done both. If the mount fits the standoff column spacing,
      then it is not problem, if not, then it just doesn't fit right. Also, I mount my GPS on the rear and generally
      on standoff columns that extend above the top deck as shown in This Picture of my Katana-LR4.
      I also make my own as shown in This Picture of my Ronin-MK1 ONE.

      I use extra standoff columns which mount the GPS higher and act as a back stop for the battery."

my drone on the back is like that 



that could be good TPU mount but how i can be sure that is good for my drone ?"https://www.banggood.com/Geprc-Mark4-Spare-Part-3D-Printing-TPU-GPS-Mount-with-T-Antenna-Fixing-Base-Support-BN-180-TBS-Crossfire-Immortal-T-V2-Antenna-p-1873939.html?cur_warehouse=CN&ID=6287830&rmmds=search"

would be good find a place where to put it.

i also find these other two models of tpu:
https://www.thingiverse.com/thing:4766096
https://www.thingiverse.com/thing:4793799


these are two models of gps:
https://it.aliexpress.com/item/400000097...5f28ca305a

https://www.banggood.com/Beitian-BN-220T...mds=search

one is very cheap.

some other advices about the model to take ?

That GEPRC mount is for one of the Beitian BN-180 GPS modules. A Matek M8Q-5883 won't fit in that GEPRC mount because it's a different size and shape. You need a mount that is specifically designed for the GPS module you intend to use and specifically for the quad you intend to use it on because the stand-offs between different frames generally have are different spacing and different heights on different quad frames. What is the height of the stand-offs on your Eachine Wizard X220 V2, and what is the spacing between the two rear stand-offs (from centre to centre)?

Another mounting option is to get a generic mount designed for the GPS module you wish to use that attaches to the LiPo strap so that your GPS module is then effectively on top of the LiPo. Something like the following...

For a Beitian BN-180:-

• https://www.thingiverse.com/thing:2980730
  

For a Beitian BN-220:

• https://www.thingiverse.com/thing:2832775
  
• https://www.thingiverse.com/thing:3217191
  
• https://www.thingiverse.com/thing:3640743
  

For a Matek M8Q-5883:-

• https://www.thingiverse.com/thing:3584878
  
• https://www.thingiverse.com/thing:4138924
  
• https://www.thingiverse.com/thing:4759541
  

i would suggest the solution by the lipostrap, its also a good position about interferences to the other antennas

(05-Sep-2021, 07:43 PM)SnowLeopardFPV Wrote: That GEPRC mount is for one of the Beitian BN-180 GPS modules. A Matek M8Q-5883 won't fit in that GEPRC mount because it's a different size and shape. You need a mount that is specifically designed for the GPS module you intend to use and specifically for the quad you intend to use it on because the stand-offs between different frames generally have are different spacing and different heights on different quad frames. What is the height of the stand-offs on your Eachine Wizard X220 V2, and what is the spacing between the two rear stand-offs (from centre to centre)?

Another mounting option is to get a generic mount designed for the GPS module you wish to use that attaches to the LiPo strap so that your GPS module is then effectively on top of the LiPo. Something like the following...

For a Beitian BN-180:-

• https://www.thingiverse.com/thing:2980730
  

For a Beitian BN-220:

• https://www.thingiverse.com/thing:2832775
  
• https://www.thingiverse.com/thing:3217191
  
• https://www.thingiverse.com/thing:3640743
  

For a Matek M8Q-5883:-

• https://www.thingiverse.com/thing:3584878
  
• https://www.thingiverse.com/thing:4138924
  
• https://www.thingiverse.com/thing:4759541
  

(05-Sep-2021, 10:05 PM)hugnosed_bat Wrote: i would suggest the solution by the lipostrap, its also a good position about interferences to the other antennas

ok thank you so much, can be a good idea with the straps

What models of GPS i can buy, the one i linked can be good for speed and return in my direction in case of Rx or vtx lost ?

Generaly can be installed with a plug and play or is required to be welded on the FC ?

It depends how much you want to spend. The Beitian GPS modules are some of the cheapest, while the Matek ones are some of the most expensive. Once a GPS module has a 3D satellite fix they generally all perform the same as far as GPS Rescue Mode is concerned. The more expensive ones tend to get a quicker 3D satellite fix, but if you use one of the "fast GPS fix" methods as per the video below then you can get also some decent results out of the cheaper modules. It's your call really.

Most of the GPS modules have a plug on the actual module itself. The other end of the wire will either need to be soldered to pads on the FC, or it can be connected via a plug depending on what FC you have.

In my experience, I have NOT yet seen an FC board with a plug already attached for the GPS.
Every FC board that I have seen requires the GPS wires to be soldered to the board, however, this is not a bad thing. 

The power wires are pretty straight forward; normally Ground (GND) and +5Volt.

Next, there are the 2 data wires; TX and RX. Since the GPS will use a UART (AUX Port), RX, TX pads; the FC will need
to have an open port. Now, which one is open {if you have one} depends on how the board is already wired and
how many, if any, ports are still open and available. That means the GPS might be wired differently on one FC vs 
another one. Again, this is not a bad thing...it is flexible.

Now, if you want to run a compass, that requires an additional DA, CL connection that is NOT a UART. Many, FC
boards do NOT have these pads broken out. If so, Great. If not, then you have start doing remapping of resources.
SnowLeopardFPV is really good at this; he is a resource Guru. Thing is, you still need a set of open pads to work with.

Yes, soldering will likely be required. 
If you are new to soldering you might want to check out my soldering tutorial:
TUTORIAL  How to Solder - Principles, Technics, Etc.   <-- Click Link.

Mounting...

Personally, I like mounting the GPS at the rear on column extensions as shown in the pictures of my Katana-LR4 and
my Ronin-MK1 ONE builds. Also, I have never experienced any interference from any antennas with this mounting
arrangement. In fact, most BNF quads have the GPS mounted at the rear...yeah, right where all of the other 
antennas are mounted. My guess is that the different frequencies of the different antennas do NOT interfere
with each other. Anyway, I have never had any issues.

Thing about any column mounting whether TPU or something else is that it must match the column spacing
on the quad frame; pretty much exactly. If it is TPU, you get what you get. If you make your own, this is not an issue.

The Battery mount TPU looks interesting, but I don't have a 3D printer so all of those Thingiverse templates 
don't work for me. However, I do believe that a battery strap mounting arrangement could be easily fabricated.

Now, as long as you use 2 battery straps, you could heat shrink the GPS onto a strip of material...plastic, fiberglass, 
plexiglass, what ever. Just center the GPS on the material and use large heat shrink tubing to connect it leaving the 
material extended on both ends so that the battery straps will hold it...one on each end of the material. 
Might be a little ghetto, but cheap and it works. In fact, I might try this on a future build.

Regarding TMac's video...

The option that seemed most feasible to me was powering the GPS directly rather than from pads on the FC.
Here is the thing...you need to add a +5Volt BEC between battery voltage and the GPS. Personally, I found 
this to be a little cumbersome and you still have to plug the battery in...so the VTX is hot while you get a
satellite fix...and... the time to acquire might have been shorter, but still longer than I wanted. 

Currently, I have the GPS power wires on a connector which I make sure is easy to reach. When I arrive at
a location, I disconnect the GPS from the connector on the quad's harness and plug in a 1S LiPo battery. 
This is safe since a 1S LiPo is never higher than 5V...yeah the GPS will actually work with as low as 3.3 volts. 
It works. After I get everything else prepared and wait a few minutes, I disconnect the 1S battery and plug 
the GPS into the quad's connector... then plug in the main battery. It works for me.

bare minimum, stay away from BN180

I run the Matek M8Q-5883 {yeah, it costs more} on pretty much all of my current quads.

I have an iFlight and one of those tiny Nameless units, but have not yet used them; 
So can't say about them.

Kaitylynn has used the Beitian GPS modules, but said they are not very durable and break
easily during crashes. She switched to Matek GPS modules which are more durable and
survive crashes better.

I view the GPS unit like a fire extinguisher; I want it to work and work well. What good
is a GPS unit or fire extinguisher if it doesn't work correctly when you need it to.

Hello

yes i will use strap mount, i saw that my fc don't have plug and play options so i will have to solder the wires on the FC.

https://i.imgur.com/Ye1JtjO.jpg
that is the diagram of my fc
https://i.imgur.com/TMqI02R.png

i don't know, my friends i don't know what gps have but he often had to wait for sat fix and to don't wait on the ground with the vtx that go to be warmer he liftoff and land again, to can use rescue mode.

Bn 180 a 220 are cheaper, but what about BN 880 or BN 880q ?
they are bigger and with bigger antenna should be quicker the fix of signal, generaly how much time it require ?

The Matek M8Q-5883 is that: https://www.banggood.com/it/Matek-System...mds=search
but they don't give the cable with it?

how much faster is the matek to take signal ?

The Matek M8Q-5883 GPS module comes with a wiring harness that has a plug on one end and bare wires on the other end to solder to an FC (see some photos HERE).

How quickly you get a fix isn't just down to the GPS module you use. It will depend on where you live, the time of day, and what method you use to power up the GPS module with the least amount of interference from other powered up components as per TMac's video in post #5 of this thread. It also depends on whether the GPS is doing a cold, warm, or hot start. If you regularly fly at the same location and the GPS module has a battery then it should get a faster fix next time you fly there. If you keep changing locations each time you fly then a fix will take longer the first time you power up the GPS module.

(09-Sep-2021, 07:37 PM)SnowLeopardFPV Wrote: The Matek M8Q-5883 GPS module comes with a wiring harness that has a plug on one end and bare wires on the other end to solder to an FC (see some photos HERE).

How quickly you get a fix isn't just down to the GPS module you use. It will depend on where you live, the time of day, and what method you use to power up the GPS module with the least amount of interference from other powered up components as per TMac's video in post #5 of this thread. It also depends on whether the GPS is doing a cold, warm, or hot start. If you regularly fly at the same location and the GPS module has a battery then it should get a faster fix next time you fly there. If you keep changing locations each time you fly then a fix will take longer the first time you power up the GPS module.

I saw the movies, but they are very tecnical infomations   

But with any GPS module like bn 220 - Bn 880q and this Matek M8Q-5883 is possible upload on the memory the position of where i will fly to have an hot start ?
they do that with computer.

can i put different locations or just one?

But in term of performance with cold start how much benefits i have if i take a Matek M8Q-5883 vs Bn 880q ?

I usually fly to the same places, maybe there is difference of few km.

(10-Sep-2021, 11:06 AM)Rosssiiii Wrote: But with any GPS module like bn 220 - Bn 880q and this Matek M8Q-5883 is possible upload on the memory the position of where i will fly to have an hot start ?
they do that with computer.

can i put different locations or just one?

But in term of performance with cold start how much benefits i have if i take a Matek M8Q-5883 vs Bn 880q ?

I usually fly to the same places, maybe there is difference of few km.

Without doing some research I don't know. The u-blox u-center software is fairly comprehensive but I've never had a need to do what you are asking, so I've never bothered to find out if those capabilities exist.

I only have a GPS module on one of my quads and I tend to fly in the same location. It gets a satellite fix from first plug-in within a few minutes. I use the USB power-up method whereby I prime the GPS module with USB power to get a fix while I'm setting up the rest of my gear before then plugging in a LiPo. After I've done that, swapping over LiPos (hot start) gets an almost instant satellite fix with no waiting around during battery changes.

(10-Sep-2021, 01:20 PM)SnowLeopardFPV Wrote: Without doing some research I don't know. The u-blox u-center software is fairly comprehensive but I've never had a need to do what you are asking, so I've never bothered to find out if those capabilities exist.

I only have a GPS module on one of my quads and I tend to fly in the same location. It gets a satellite fix from first plug-in within a few minutes. I use the USB power-up method whereby I prime the GPS module with USB power to get a fix while I'm setting up the rest of my gear before then plugging in a LiPo. After I've done that, swapping over LiPos (hot start) gets an almost instant satellite fix with no waiting around during battery changes.

How does it work the usb method to have the hot start ?

what i need to buy and what is yor gps model ?

(10-Sep-2021, 02:38 PM)Rosssiiii Wrote: How does it work the usb method to have the hot start ?

what i need to buy and what is yor gps model ?

My GPS module is connected to a 5V pad on the flight controller that gets powered up when USB power is applied to the FC.

When I'm out in the field I simply just connect my Android phone to the USB port of my flight controller which powers up the FC and also the GPS module. While not strictly necessary, I also run up the Android version of Betaflight Configurator app on my mobile phone and switch to the GPS tab so I can monitor the progress of satellites getting a 3D fix, which usually only takes a minute or two at most. Once I have a 3D satellite fix I then connect up a LiPo and disconnect the USB cable from my FC. I don't need to reconnect my mobile phone to the FC between LiPo changes. Swapping over a LiPo gets an almost instant satellite fix when reconnecting the new LiPo.

I'm using a Matek M8Q-5883 GPS module. I don't bother with the compass on it because the module is mounted too close to the frame for that to be of any use, so I just connect 4 of the 6 wires to my FC. Photos are HERE and HERE.

Keep in mind that some people have better results and faster satellite fix than others depending on where in the world you live and the time of day you fly. You will only find out if you are in a good or a bad area once you have the GPS module installed and are able to test it out.

Basically, if you power up your GPS off a 5v pad that powers up when the FC connected is connected via usb then you can avoid any electrical or RF noise in quad since the ESC and vtx will not be powered on. This helps the GPS get a faster lock.

Then you simply plug in your lipo and unplug the usb power source.