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cyoung / stratux

Aviation weather and traffic receiver based on RTL-SDR.
BSD 3-Clause "New" or "Revised" License
1.06k stars 362 forks source link

1090 "drop off" after 5 to 30 minutes #202

Closed ssokol closed 8 years ago

ssokol commented 8 years ago

Running 0.5b5. Dual band system with NESDR nano 2s + Vk-172. dmurray14 antennas. Ground testing, so no UAT signals.

When I start the system I get a usual 1090-ES stream - typically 500 messages / minute. After some time, between 5 and 30 minutes, the 1090 stream tapers off to very low numbers. As few as 12 messages per second.

Give the box a hard reboot (the reboot button seems to cause it to hang - something we've seen before) and when it comes back up, we're back to 500+ messages / minute.

Any ideas?

Axtel4 commented 8 years ago

I've been running for an hour or so. Is this bad? I am not sure what the 7,640/10,178 signifies.

2016/01/11 21:42:54 stats [started: 1 hour ago] 2016/01/11 21:42:54 - CPUTemp=37.39 deg C, MemStats.Alloc=2.5 MB, MemStats.Sys=13 MB, totalNetworkMessagesSent=253,433 2016/01/11 21:42:54 - UAT/min 0/0 [maxSS=0.00%], ES/min 7,640/10,178 , Total traffic targets tracked=247

v0.5r5, Dual dongles, RY835, 1090 MHz collinear feeding 1090 dongle, L Band blade feeding 978 Dongle. Outside MCI Mode C veil.

cyoung commented 8 years ago

7,640/10,178 means 7,640 messages last minute, 10,178 highest message/min.

Axtel4 commented 8 years ago

Thanks.

ssokol commented 8 years ago

Wow. That's some serious reception. Best I've seen is in the 1300 messages per minute range.

I'm based on the east edge of the MCI veil at 0N0. Are you local or just passing through?

On Monday, January 11, 2016, cyoung notifications@github.com wrote:

7,640/10,178 means 7,640 messages last minute, 10,178 highest message/min.

— Reply to this email directly or view it on GitHub https://github.com/cyoung/stratux/issues/202#issuecomment-170778862.

Steven Sokol 408 Camelot Drive Liberty, MO 64068

mobile: +1 816-806-8844 fax: +1 816-817-0441

duecedriver commented 8 years ago

I wrote up something similar last week over on one of the Reddit threads. Same behavior. Although putting an ice pack over the sdr increased traffic

When tuning the sdr with sdr sharp it drifts really badly on narrow band fm

Can anyone see if something is actually getting jammed up in the code?

Axtel4 commented 8 years ago

Local on the southwest side.

Axtel4 commented 8 years ago

If it helps any, here is an ES range plot and the Stratux log for above.

range plot Stratux.txt

cyoung commented 8 years ago

@ssokol - try with no cooling, let 'er get heated.

Axtel4 commented 8 years ago

I'm based on the east edge of the MCI veil at 0N0.

Roosterville. Always wanted to land there just to say I did.

duecedriver commented 8 years ago

Best I have gotten is like 30 miles.that sitting on the ground testing in the house. Is that in the air

skypuppy commented 8 years ago

Thermal drift of the rtlsdr?

On 01/11/2016 08:50 PM, Steven Sokol wrote:

Running 0.5b5. Dual band system with NESDR nano 2s + Vk-172. dmurray14 antennas. Ground testing, so no UAT signals.

When I start the system I get a usual 1090-ES stream - typically 500 messages / minute. After some time, between 5 and 30 minutes, the 1090 stream tapers off to very low numbers. As few as 12 messages per second.

Give the box a hard reboot (the reboot button seems to cause it to hang - something we've seen before) and when it comes back up, we're back to 500+ messages / minute.

Any ideas?

— Reply to this email directly or view it on GitHub https://github.com/cyoung/stratux/issues/202.

ssokol commented 8 years ago

Will do.

On Mon, Jan 11, 2016 at 10:32 PM, cyoung notifications@github.com wrote:

@ssokol https://github.com/ssokol - try with no cooling, let 'er get heated.

— Reply to this email directly or view it on GitHub https://github.com/cyoung/stratux/issues/202#issuecomment-170786684.

Steven Sokol 408 Camelot Drive Liberty, MO 64068

mobile: +1 816-806-8844 fax: +1 816-817-0441

ssokol commented 8 years ago

Yep. 18' wide and 2700' long. I learned to fly here - lots of fun. You just treat the asphalt as a centerline in the middle of a 50'-wide grass runway.

On Mon, Jan 11, 2016 at 10:42 PM, Axtel4 notifications@github.com wrote:

I'm based on the east edge of the MCI veil at 0N0.

Roosterville. Always wanted to land there just to say I did.

— Reply to this email directly or view it on GitHub https://github.com/cyoung/stratux/issues/202#issuecomment-170787988.

Steven Sokol 408 Camelot Drive Liberty, MO 64068

mobile: +1 816-806-8844 fax: +1 816-817-0441

ssokol commented 8 years ago

Can't reproduce this at the moment, so closing. (But opening another ticket as I think I may have found a related bug.)