Thanks! signed to unsigned conversion was the culprit. I first tested it
with cox by converting the file and then tweaked my code to do that
within the receive path.
I now have a working port of dump1090 to HackRF. I need to do some
cleanup but as soon as done, will post it on GitHub and announce on this
forum.
On 6/27/15 1:29 PM, Donald Pupecki wrote:
I don't believe hackrf_transfer and rtl_sdr output in the same format.
They are both 8 bit but the hackrf output is signed whereas the rtl
output is unsigned.
If you get this working a hackrf please post the port on github or
somewhere as that would be sweet.
On Jun 27, 2015 4:00 PM, "Ilker Temir" <[email protected]
<mailto:[email protected]>> wrote:
Hello,
I am trying to add HackRF support to Salvatore Sanfilippo's
dump1090 tool (https://github.com/antirez/dump1090) as a learning
exercise. The tool was originally designed for RTL SDR devices.
However, I can't seem to get this port to work.
To eliminate potential issues in my code, I simplified the
troubleshooting steps. Here are the basic set of troubleshooting
steps I am using:
Per tool's documentation, a data file can be captured with rtl_sdr
utility in the following way:
rtl_sdr -f 1090000000 -s 2000000 -g 50 output.bin
Then you can pipe it into dump1090 like this:
dump1090 --ifile output.bin
I made an assumption that the HackRF equivalent of rtl_sdr command
above would be the following:
hackrf_transfer -r output.bin -f 1090000000 -s 2000000 -p
0 -a 0 -l 40 -g 62
However, capturing packets with HackRF this way and piping them
into dump1090 doesn't do anything. I have tried this sitting next
to an airport and capturing packets while planes were landing and
taking off. I don't have an RTL SDR dongle so I can't test the
rtl_sdr command myself. It didn't make to sense to buy a RTL SDR
device after HackRF but if I can't crack this, I am considering to
buy one.
BTW, I also tried different gain settings, and sample rate of 8e6
with hackrf_transfer, no difference. That said, I never enabled
amp_enable.
Would anyone know if rtl_sdr and hackrf_transfer capture the
packets in the same way and format? Or do I need to do some kind
of a conversion or translation in between the two to make them
compatible?
Any help or idea will be appreciated.
P.S. I am aware of gr-air-modes for HackRF to decode ADS-B
signals. My goal is to hack dump1090 and add HackRF support as a
learning exercise.
Thanks,
Ilker
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