FR24 box- GPS data

[Amper]

I noticed that the GPS data do not change when you change the position of the antenna. In my case, I raised the some antenna for 10m, but FR24 box continues to read 70m, although that's not the height at which it was located before.
It seems to me that the receiver does not read position continuously, but remembers the starting position.

[fungus]

I noticed that the GPS data do not change when you change the position of the antenna. In my case, I raised the some antenna for 10m, but FR24 box continues to read 70m, although that's not the height at which it was located before.
It seems to me that the receiver does not read position continuously, but remembers the starting position.

I cant pretend to be an expert on that particular issue, but it looks to be the elevation of your position above sea level, not the elevation of the antenna. I'll stand corrected though.

Regards,
Gregg

[Amper]

it should be elevation of gps antenna, or am I wrong?

[Jarod]

I noticed that the GPS data do not change when you change the position of the antenna. In my case, I raised the some antenna for 10m, but FR24 box continues to read 70m, although that's not the height at which it was located before.
It seems to me that the receiver does not read position continuously, but remembers the starting position.

I have asked the same question in private. Height is not important for MLAT and is not used. "The GPS is used for timing, the altitude is not important."
If you wait long enough, the height will update though.


And of course this is the height of the GPS antenna (not the ADS-B antenna).
59.9m [AMSL] = Height above mean sea level (AMSL)

[FR24support]

it should be elevation of gps antenna?

Yes, correct.

[Amper]

then i think my gps part is not working correctly

[peterhr]

I have asked the same question in private. Height is not important for MLAT and is not used. "The GPS is used for timing, the altitude is not important."
If you wait long enough, the height will update though.


And of course this is the height of the GPS antenna (not the ADS-B antenna).
59.9m [AMSL] = Height above mean sea level (AMSL)

I always wonder just what that means, does it take into account that the planet is an oblate spheroid rather than being a perfect sphere and that the oceans do get drawn to areas where the gravity is higher (think Himalayas) and possibly where oceanic currents pile up against the shore line before changing direction...

[fungus]

Thanks for clearing that one up guys. It seems there are two antennas- GPS antenna and ADS-B antenna. The GPS antenna sends (or is supposed to) the elevation data.

Regards,
Gregg

[vu2pmc]

Hi,
How do you get the GPS info from your premium account? I clicked on More info, and it only shows the co ordinates, not the height or temp.

Thanks in advance

[Amper]

There is no info in premium.
Type IP of your FR24box in your browser and there it is,all info you need.

[Mike]

I just want to comment the GPS Altitude and Temp data accuracy.

GPS is very good for giving a good location on a mpa, but it has not been optimized for calculating altitudes. In some cases you can get quite good values in other cases worse values. Don't care so much about this value.

Temperature value is not the temperate around the receiver but somewhere near the processor (CPU).

[Amper]

@ Mike
Is what is the min & max operating temp. of the box.
Is there overheating protection?
My box is outdoor mounted in protective case and I need to know should I install fan before summer comes?

[SpaxmoidJAm]

i think if you look at the GPS information (if its the same as a radarcape thinking different firmware), its a 0D fix it might only checking long and lat values (if at all after initial fix hence 0D) it is purely interested in the time from the GPS and the 1PPS clock, I dont think much else is used.

The GPS is almost purely been used for time stamping the information as it arrives to the FR24 receiver, that information could then take many seconds to get to the FR24 server but when it's processed it accurate. Reality is because of the way the FR24 receivers are working it takes less time to get to them than say software via your PC.

This is especially important for accurate MLAT locations as any information that comes from FR24 receivers will have effectively to the fraction of a second the same time reference.

[Mike]

@ Mike
Is what is the min & max operating temp. of the box.
Is there overheating protection?
My box is outdoor mounted in protective case and I need to know should I install fan before summer comes?

We don't know exactly but we are running it outdoor in all temperatures from Iceland to Dubai without any known issues.