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European Shared feeds

Posted: Sun Mar 23, 2014 6:29 pm
by jonfear
Hi There everyone

I am slowly building a UK and Ireland based VRS server, this can be seen at http://www.wslvr.co.uk.

I am now publicly looking for Raspberry Pi based feeders. The London area is pretty much covered. I am looking for feeds in the Midlands, Wales, North West and Scotland. Any feed from the deep south west and Channel Islands would be most welcome. If you see a hole that you can fill, I need you!

I will accept feeds from other devices however I am initially looking at the RPi solution as we are trying to get MLAT working for that. The RPi should be outputting Beast data on port 30005.

The data that is shared on the VRS server is NOT shared with anyone else. Your data is your own to do with as you please! If you want your data specifically named on the server then please say so.

Please PM me rather than put your offer in the public forum.

Best wishes and Thanks

Jon

Re: UK Shared feeds

Posted: Sun Mar 23, 2014 7:25 pm
by Jester
I'm assuming dump1090 on Rpi ?

Re: UK Shared feeds

Posted: Sun Mar 23, 2014 8:15 pm
by jonfear
Hi Jester

Yes, I would prefer the new git image from MalcolmRobb as well...git://github.com/MalcolmRobb/dump1090.git

Jon

Re: UK Shared feeds

Posted: Sun Mar 23, 2014 8:46 pm
by Jester
Although my antenna is not pointing that way, I do have coverage til Norwich, covering the channel between UK and NL, once this NSS2014 fun is over (google it) I'll have a look and PM you.

I'm also playing with this on the Pi:
http://forum.virtualradarserver.co.uk/v ... ?f=7&t=333

Re: UK Shared feeds

Posted: Fri Mar 28, 2014 4:50 pm
by Jester
Question, I'm running currently a SBS-1e in parallel with a pi and Dump1090, what do other people use as start-up parameters ?
Setup: Pi with R820T/RTL2832U connected to external antenna on a high roof in a busy area (EHVB/EHRD/EHAM close by)

I'm using the parameters below:

./dump1090 --quiet --net --net-beast --fix --mlat --modeac --net-ro-size 500 --net-ro-rate 5 --lat xxx --lon yyy --phase-enhance --enable-agc &



P.S.
I switched --aggressive off at the CPU usage spiked to 98%

Re: UK Shared feeds

Posted: Sat Mar 29, 2014 8:32 am
by jonfear
Jester wrote:Question, I'm running currently a SBS-1e in parallel with a pi and Dump1090, what do other people use as start-up parameters ?
Setup: Pi with R820T/RTL2832U connected to external antenna on a high roof in a busy area (EHVB/EHRD/EHAM close by)

I'm using the parameters below:

./dump1090 --quiet --net --net-beast --fix --mlat --modeac --net-ro-size 500 --net-ro-rate 5 --lat xxx --lon yyy --phase-enhance --enable-agc &

P.S.
I switched --aggressive off at the CPU usage spiked to 98%
Hi Jester

This is my command line:

./dump1090/dump1090 --quiet --enable-agc --aggressive --net --net-beast &

I had no need for mlat, modeac or the net size commands. I have not seen the phase-enhance before so cannot comment. The fix is a dangerous switch to use and is not recommended.

The beast output should have all the information needed for mlat. modeac produced no real improvements here.

Hope this helps.

Jon

Re: UK Shared feeds

Posted: Sat Mar 29, 2014 9:26 am
by Jester
Thanks.

Can you explain the logic about not using --fix but using --aggressive ? as --fix tries to correct one bit errors and --aggressive tries to fix 2 bit errors...

Re: UK Shared feeds

Posted: Sun Mar 30, 2014 7:27 am
by jonfear
Yes...

According to many forums and user groups, the --fix switch actually causes more problems than it fixes and therefore is not recommended. The --aggressive switch however is heavily recommended as it appears to work well.

We were having a discussion about the decoding issues associated with dump1090 over a couple of pints yesterday evening. It appears that there is a 32bit checksum on the data however dump1090 is not using this fully. My friend has some ideas on improving the decode algorithm and proper usage of the full checksum. This is on his list however he is busy on another unrelated bit of software that has higher priority. Once that code is written, he hopes to be back on MLAT and dump1090.

Hope this helps...

Jon

Re: UK Shared feeds

Posted: Sun Mar 30, 2014 9:28 am
by Jester
Thanks Jon,

If your friend is/or has pull for the writer of dump1090, please point him to this pull request:
https://github.com/antirez/dump1090/pull/50

Speed ups for pi are most welcome in heavy use area's :)

Thanks again

Re: UK Shared feeds

Posted: Sun Mar 30, 2014 11:35 am
by jonfear
Jester wrote:Thanks Jon,

If your friend is/or has pull for the writer of dump1090, please point him to this pull request:
https://github.com/antirez/dump1090/pull/50

Speed ups for pi are most welcome in heavy use area's :)

Thanks again
He has been pointed in that direction. I hope to have some comment later.

FWIW the latest MalcolmRobb git version is working very well on our systems. On http://www.wslvr.co.uk they are the RPi-1, RPi-2, Astronet and NE Eng Feed.

** Anyone in Manchester, Sheffield, Cornwall or Scotland got a Pi that we can add to the coverage? **

Jon