stuck on "reading samples in async mode"

FlightAware ADS-B Flight Tracking
1

Hi All

I have dump978 running with a 978Mhz spider antenna. When I run the pipeline in Linux, I get the message:

todd@todd-VirtualBox:~$ cd dump978b/dump978
todd@todd-VirtualBox:~/dump978b/dump978$ rtl_sdr -f 978000000 -s 2083334 -g 48 - | ./dump978 | ./uat2text
Found 1 device(s):
0: Generic, RTL2832U, SN: 77771111153705700

Using device 0: Generic RTL2832U
Found Rafael Micro R820T tuner
Exact sample rate is: 2083334.141630 Hz
Sampling at 2083334 S/s.
Tuned to 978000000 Hz.
Tuner gain set to 48.00 dB.
Reading samples in async mode…

It stays stuck here and I see no data

Any thoughts?

Todd

2

Is your goal to display it on a dump1090 host? If so, change it to:


/usr/bin/rtl_sdr -f 978000000 -s 2083334 -g 48 - | /usr/local/dump978/dump978 | /usr/local/dump978/uat2esnt | /bin/nc -q1 127.0.0.1 30001 &

If your dump1090 isn’t local, change the IP address as needed…and adjust your local paths as needed.

3

Todd,

not many aircraft equipped with UAT yet, so you may not getting any UAT “hits” and you probably not within line of sight from ADS-R station. I am seeing fewer than 10 UAT planes a day. Let it run for a while.

4

Alex

I am physically quite close to the nearest antenna/station. Normally it is humming with activity.

Thanks
Todd

5

Todd,

sorry, I have no idea what may cause that. Could you check if your SDR dongle is operational with rtl_test or gqrx?

Alex

6

Alex

Im a bit brain dead tonite…where is the rtl_test.exe located?

Todd

7

solved it…finally got outside to the antenna…wind blew it down!!!

sorry
Todd

8

Glad to hear that. The symptoms you described let me think that rtl-sdr have connected to the dongle but the radio samples the rtl-sdr receives from the dongle and passes to dump978 had no useful data, hence I asked you to check if the dongle is operational. The rtl_test is a part of the rtlsdr package, so you should be able to run it on the Linux box (looks like you are running Linux virtual machine). GQRX is a separate package you can install on the Linux box. GQRX analog on Windows is SDR#.

Alex

9

Thanks, Alex…I did figure out how to run rtl_test after a while…and it seemed to work

Todd