AvareX showing traffic with it's pressure altitudes

[Tzanko Tzanev]

AvareX is showing traffic labeled with it's +/- pressure altitude (not +/- relative to my pressure altitude). This is not right because if I fly at 2500' and I see converging  traffic labeled +/-2500', that means the traffic is at my altitude, not 2500 above/below me. Contrary, when the traffic is labeled +/-500' it warns me for collision, even though it's actual altitude is 500' pressure altitude. 

Regards, TJ

[John Schreiber]

That is very interesting. It seems your ownship for some reason is seen at sea level, by AvareX. This could be due to a mismatch in ICAO ownship filtering. I would compare the filter information with a PAPR report for the aircraft you were flying when you noticed this. You have three devices to compare. Your ads-b OUT device, your ads-b IN device, and AvareX. 

Note that there are 8 bit and 16 bit ICAO versions of your registration number. You will find these in the aircraft registry. 

[John Schreiber]

I suppose that the MODE C function of your transponder could also have a fault. What is the transponder/ADS-B out package? Are you 1090/UAT, or 1090 ES?

[Tzanko Tzanev]

See attached pics for aircraft entry in AvareX and Registration.

TJ

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[Apps4av Support]

You need to send me the contents of the ownship packet from the ADSB status tab.

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Apps For Aviators Support,

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[Tzanko Tzanev]

How can I access this data (using AvareX)?

The flight was on Saturday, 7/25/2926 1:10PM - 3:44PM CDT route: KDWH-60R-11R-KELA-KTME-KDWH.

TJ 

[John Schreiber]

I was under the impression that we were to use the 8 bit ICAO ID as a filter. Has this changed or am I confused. 

[Tzanko Tzanev]

If my airplane Mode S Code AA664B is a hexadecimal number, it's 24 bit long.

TJ

To view this discussion visit https://groups.google.com/d/msgid/apps4av-forum/55ac6570-61f8-42fe-8460-276c596a9590n%40googlegroups.com.

[Tzanko Tzanev]

[Larry Larson]

I have the same problem. I was told it was the Stratux has no GPS reference. I changed the position so it could see the sky. It fixed the problem for one flight then changed back.

To view this discussion visit https://groups.google.com/d/msgid/apps4av-forum/CAAFF_ybY6uh0gs%2BPV-qOGasgTPz3Dy3igoUdkJjS86Z3LpUWWQ%40mail.gmail.com.

[Jeffrey Ross]

by chance are you using an internal GPS on the StratuX device?  I have found using the internal GPS modules to be very unreliable as they get effected by RF noise generated by the SDR modules.  I changed to an external GPS module and the GPS issues went away.

To view this discussion visit https://groups.google.com/d/msgid/apps4av-forum/CANiEHLVhss%2BmzxQJM3fQ4oAS2-tYOT-5okTGn48ZeMUcwzzT-Q%40mail.gmail.com.

[John Schreiber]

I have also had better luck with external GPS modules. I also find that PI like 5.2V if they can get it. 

RE: Octal or HEX ownship. Stratux wants HEX, like you show in the image, the original AVARE wants Octal. (no letters). Again I don't know if there is a change in X or the latest OG Avare versions. 

[Tzanko Tzanev]

I am using internal GPS source from my cell phone, not the Stratux GPS receiver (I don't have one installed, nor the AHRS is installed).

TJ.

To view this discussion visit https://groups.google.com/d/msgid/apps4av-forum/439a9a11-b4b6-45d3-9b3c-c2073aa8f356%40bubble.org.

[Jeffrey Ross]

No GPS receiver in your Stratux? That is why are you are seeing pressure altitude. pick up a VK-162 GPS module, they are less than $20.  One word of caution, the receiver has a magnet in the bottom of it, peal back the sticker and pull the magnet out.

Jeff

[Tzanko Tzanev]

Jeff,

Can elaborate little more about the "pilling off the magnet" under the sticker of VK-162 GPS?

What is this magnet for?

Why this magnet is there?

TJ

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[Jeffrey Ross]

the magnet is there so that you can stick the antenna on a steel surface, it serves no purpose otherwise other than to potentially screw with your compass.

To view this discussion visit https://groups.google.com/d/msgid/apps4av-forum/CAAFF_yZTzwn1z_CZ5MBAoi%2BOGPfy4i_k%2BG0Z%2B67FDhZK1i5DaQ%40mail.gmail.com.

[Larry Larson]

Yes. Internal. What external do you recommend?

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[Jeffrey Ross]

see my comment below in the thread for the GPS.

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[Tzanko Tzanev]

Jeff is recomending VK-162 GPS, but it looks like this device has to sit outside the Stratux enclosure.

I am looking into GPYes 2.0 u-box 

TJ

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[Jeffrey Ross]

I strongly recommend *AGAINST* the internal GPS modules like the GPYes 2.0 u-box, what happens is the SDR modules generate a lot of noise and they will cause problems for the internal GPS modules to obtain and/or maintain a GPS position.  If you look through the software revision history of the StratuX you'll see that there were attempts to help the internal GPS to obtain a GPS lock by delaying the SDR's initialization. 

I'm not going to say that the internal GPS modules won't work but there is a very likely chance the GPS position reporting will be less than reliable.

Jeff

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[Tzanko Tzanev]

I think the AvareX developers should take a close look of this issue.

The legacy Avare filters the "own aircraft" just fine when the user selects Preferences->GPS->GPS Position Source->Build-in GPS Only.

Regards, TJ.

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