AvTraffic™ air traffic conflict monitoring and alerting app for iPhone and iPad.

[Thruster88]

6 hours ago, coljones said:

Was the FR24 enemy on ADSB-Out or MLAT (a construct by FR24 and others) - which uses transponder bounces to generate AC position info. Almost all GA have transponders but not all GA have ADSB out or EC. (nor need to have - unless they are IFR)

Pretty sure fr24 only displays aircraft with adsb transponders based on what i see locally. 

[sfGnome]

Google’s take on it is “Flightradar24 primarily relies on its huge network of ground-based receivers picking up ADS-B signals from aircraft transponders, but it also uses other data sources like MLAT (Multilateration) and official radar feeds for better coverage, especially over oceans or for flights without ADS-B. While ADS-B is the main source, other technologies fill in gaps where ADS-B coverage is limited, giving a more complete picture of air traffic.”

 

That would explain why it was showing Skip’s plane as 1200 - it was picking up his transponder, not his ADSB (which, of course, raises another question…)

[Methusala]

3 hours ago, sfGnome said:

Google’s take on it is “Flightradar24 primarily relies on its huge network of ground-based receivers picking up ADS-B signals from aircraft transponders, but it also uses other data sources like MLAT (Multilateration) and official radar feeds for better coverage, especially over oceans or for flights without ADS-B. While ADS-B is the main source, other technologies fill in gaps where ADS-B coverage is limited, giving a more complete picture of air traffic.”

 

That would explain why it was showing Skip’s plane as 1200 - it was picking up his transponder, not his ADSB (which, of course, raises another question…)

And (possibly) that question is, does fr24 use primarily transponder signals to track most targets (not ADSB?) as I believe from observation.

Edited 21 hours ago by Methusala

[coljones]

2 hours ago, Methusala said:

And (possibly) that question is, does fr24 use primarily transponder signals to track most targets (not ADSB?) as I believe from observation.

Quite a few aircraft in the training area DON'T have ADSB Out as it is expensive to add and most of the old GA trainers have old Mode A, C or S with no provision to upgrade to ADSB Out. The owners may upgrade when their current transponder dies or ADSB Out is mandated - ADSB Out isn't mandated for Day VFR or RAAus (yet). Aircraft without ADSB Out are captured to FR24 (and others) by MLAT (or other tech)

[coljones]

An FR24 screenshot - a C182 detected at Jandakot detected using MLAT ie no ADSB Out.

[skippydiesel]

At some stage in your technical to & fro, would you mind advising me - do I have a transponder conspicuosity problem or not??

 

Note: I have a transponder/ADSB, Mode S (OUT, 1200), SK.2 (ADSB IN/OUT)  & OzRunways/iPad - hopefully all operating, reporting my position & showing the position of other aircraft.😈

[Thruster88]

15 minutes ago, coljones said:

An FR24 screenshot - a C182 detected at Jandakot detected using MLAT ie no ADSB Out.

OK so that c182 would have to be mode S or better to be transmitting the data. Have never seen an aircraft with no data showing which would be the case with a mode C or A transponder. 

[Thruster88]

8 minutes ago, skippydiesel said:

At some stage in your technical to & fro, would you mind advising me - do I have a transponder conspicuosity problem or not??

 

Note: I have a transponder/ADSB, Mode S (OUT, 1200), SK.2 (ADSB IN/OUT)  & OzRunways/iPad - hopefully all operating, reporting my position & showing the position of other aircraft.😈

FR24 can see you. When you go flying if you don't see your aircraft on the screen all the time then it is the SkyEcho2 that is most likely making you visible.  

[skippydiesel]

31 minutes ago, Thruster88 said:

FR24 can see you. When you go flying if you don't see your aircraft on the screen all the time then it is the SkyEcho2 that is most likely making you visible.  

Thanks Thruster88,

".... if you don't see your aircraft on the screen all the time ....." do you mean if you don't see my aircraft on your FR24/screen???

 

On an earlier matter - I have mt SE2 in the aircraft, will not bring it home to check settings, for quite a few days. Heavy rain at The Oaks, will mean no flying, even if weather good, until field dries out enough for my 4" tail wheel.😈

[Thruster88]

If your transponder is not visible to your SkyEcho2 then it is not visible to other aircraft. Your SkyEcho2 would be making you visible.  Next time you fly turn off the transmit function of the SkyEcho2  and see if you appear on fr24.

[skippydiesel]

3 hours ago, Thruster88 said:

If your transponder is not visible to your SkyEcho2 then it is not visible to other aircraft. Your SkyEcho2 would be making you visible.  Next time you fly turn off the transmit function of the SkyEcho2  and see if you appear on fr24.

I have no idea how to access fr24.

 

I would rather contact Sydney Radar and ask if my transponder is working.😈