Now talking about Air-to-Ground. Do you know, for a fact, that I will be able to pick these signals with no issue, even when the ballonn has already moved 100 km away, from the ground, at SF=7 with no problem? I don't have any way to test this other than risking to lose all the payload if I happen to actually lose the signal...
WOW!!! So I'm definitely aiming too high if that's the case.The thing is, like I said before, once you release the balloon there's no way back (you know this), so if things don't work like you expected, the whole project is gone...With this I mean that I would try to get the code and everything as simple as I can. I may pick a SF a little above what I would expect to be valid and try to use the best antenna I can.Now that you've done this before, let me ask you something if you don't mind.What antenna did you use both for the payload and the chaser?What GPS module did you use? I'm using for these tests the NEO-6M Ublox GPS but this one doesn't go beyond 18Km in height, so Im awaiting for a NEO-8M to arrive, which does go beyond 18Km.Any help on this topic would be appreciated, Im a teacher collaborating with 9 kids in this school project and I can't fail with this Thanks in advance
I can configure all the parameters in the GPS?
Configure it over serial, either from Arduino or using Ubloxes Ucenter utility.
Ok I uploaded the "SerialPassThru" sketch to my arduino, downloaded the Ucenter tool, and it does connet well to the GPS with the Arduino in between.All I have to change is in NAV5 switch from Dynamic Model->0-Portable to 6-Airborne<1G?Is this it? Is there any way to actually confirm that these GPS is fully capable of >18km=Thanks a lot!!
Testing the GPS is easy, you put it on a high altitude balloon and if its not configured right it will stop working once it reaches a certain altitude.
Which route did you take on this subject?
Well, one of the batteries you mentioned is used quite often.Ideal mini project for class I would have though, which batteries are good in the cold. Chuck them in the freezer for a while, insulate them so they stay cold, and then measure the voltage under load.
I would test what you are saying, but Im expecting -50->-60ºC up there but freezers here don't usually go under -15..-20ºC...