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Re: [Paparazzi-devel] which GPS module for Lisa/M

From: Stephen Dwyer
Subject: Re: [Paparazzi-devel] which GPS module for Lisa/M
Date: Fri, 2 Aug 2013 10:54:30 -0600

Hello Alonso,

Yes, as Marius said, you can adjust the voltage levels of UART3 on Lisa/M v2. Keep in mind that some GPSs, while accepting 5V power due to a regulator onboard, do NOT accept 5V UART levels.

The patch antennas tend to have higher gain, but are more directional and thus are required to be more parallel to the horizon to work correctly. The helical antennas are a little bit more effective omnidirectionally (I think?), but they also claim to have better out-of-band signal rejection to reduce interference with other rf signals on your vehicle. I have used both but can't seem to tell a different really.

The only concern I would have with the Hobbyking one is they did not integrate the antenna onto their PCB; instead they use a short pigtail to an external antenna board that is just stacked on top. Each connector introduces potential mechanical failure points - in a high vibration environment this might be an issue. As well, each connector and length of coax introduces loss into the system, reducing the sensitivity and effectiveness of the unit.

Shameless plug: the Paparazzi designed ublox GPS module works well and has been proven over a number of years, and is available from PPZUAV. If you ask nicely you might even be able to get a cable made specifically for your autopilot (not sure though).

Hopefully that helps a bit.

-Stephen Dwyer

On Tue, Jul 30, 2013 at 12:50 AM, Marius Pfeffer <address@hidden> wrote:


You can choose Jumper 6(uart3 connected to vin (i recomend to use a 5v bec on vin) ) or Jumper 7(uart3 connected to 3.3v rail) take a look at the wiki, there is a picture where these jumpers are located. And a description what each jumper does. Never connect J6 and J7 at the same time !

I think the beste place for the antenna is under a thin plastic on the top of the fixedwing(for protection against enviromental influences). But not covered with any thicker than necessary.

Am 30.07.2013 08:38 schrieb "alonso acuña" <address@hidden>:
Hi. We're planning on getting a Lisa/M or Lia board for a fixed wing and need to pick a GPS module.

Apparently the second one is 3.3V only.  Lisa board is giving 5V but I understand that with a jumper change this can be changed to 3.3V. Correct?

Also I am a bit confused about the antennas. Which one is better? Is it recommended to get an additional antenna? What would be the best way to position these on the airframe?

Is there some other better option?


Alonso Acuna

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