I’ll wait until a nice sat/sun to worry about it. With the uavionix beacons becoming popular I think we’ll see more and more uat as we get closer to the end of 2019. I’m within the mode c veil of a class b airport so adsb will be required.
What antenna are you using?
Also to be quite honest i don’t know what the “pre-programmed” part means in the dongle description.
Two “nano” sized SDRs, 1x pre-programmed for Stratux 1090ES, 1x pre-programmed for Stratux 978 MHz/UAT. Does not include antennas.
New : Now with updated R820T2 tuner.
(https://www.amazon.com/Stratux-1090ES-UAT-Radio/dp/B01ENU1DQC/)
So i’m not sure it’s receiving stuff at other frequencies.
You could do a spectrum scan, that should show you if it has some kind of filter or is specific to a certain frequency.
(Do I Need A Filter?)
Instead of being software defined the frequency is preset, I believe. Wire antenna for testing but I’m less than a mile from a ga airport so I should see some results on a sunny vfr day. At some point I’ll order a better antenna and receiver. This is stuff I had on hand for testing.
If that was true, then Nooelect set of 2 dongles for Stratux will not work with Statux, as these are NOT pre-tuned to any frequency and both can be used for 1090 mhz. Actually these were SERIALIZED. for stratux, which you now changed to 00001090 and 00000978 to suite dump1090-fa & dump978-fa
.
The Stratux dongles are serialized/tagged in this format:
stx:978:-24
and
stx:1090:-28
not mine anymore, 0 is the blue flightaware dongle and 1 is the stratux dongle.
pi@piaware:~ $ rtl_test -t
Found 2 device(s):
0: Realtek, RTL2832U, SN: 00001090
1: Realtek, RTL2838UHIDIR, SN: 00000978
I have an antenna and filter on the way, just couldn’t figure out the cabling until I get the parts on hand first. More attic time. Greeeeat. 
This little pi is a trooper, it lives in a hot/cold attic and never complains. I haven’t restarted it myself or touched it in almost 2 years.
anyway, I got some messages!!!
May 31 01:01:36 piaware piaware[377]: 317344 msgs recv’d from dump1090-fa (2187 in last 5m); 315680 msgs sent to FlightAware
May 31 01:01:37 piaware piaware[377]: 138 msgs recv’d from dump978-fa (0 in last 5m); 138 msgs sent to FlightAware
My Skyview for 978 just keeps showing the sun looking thing and line showing it’s loading. I’ve upgraded to 3.7.1 and have my data going to FA without any issues. Any help would be appreciated.
Ctrl+F5 (reload browser) several times.
May be Ctr+Shift+Delete (clear browser cache)
Let’s see if it’s really running:
sudo journalctl --no-pager -u dump978-fa
sudo journalctl --no-pager -u skyview978
pi@piaware:~ $ journalctl --no-pager -u dump978-fa
Jun 01 02:01:57 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:01:57 piaware dump978-fa[11028]: SoapySDR: 1 recent input overruns (sample data dropped)
Jun 01 02:02:57 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:02:57 piaware dump978-fa[11028]: SoapySDR: 1 recent input overruns (sample data dropped)
Jun 01 02:04:57 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:04:57 piaware dump978-fa[11028]: SoapySDR: 1 recent input overruns (sample data dropped)
Jun 01 02:05:57 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:05:57 piaware dump978-fa[11028]: SoapySDR: 1 recent input overruns (sample data dropped)
Jun 01 02:07:47 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:47 piaware dump978-fa[11028]: SoapySDR: 1 recent input overruns (sample data dropped)
Jun 01 02:07:47 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:47 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:47 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:48 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:49 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:50 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:51 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
Jun 01 02:07:52 piaware dump978-fa[11028]: SoapySDR: overflow
pi@piaware:~ $ sudo journalctl --no-pager -u skyview978
– Logs begin at Fri 2019-05-31 04:22:37 UTC, end at Sat 2019-06-01 02:08:14 UTC. –
May 31 04:23:05 piaware systemd[1]: Started skyview978 ADS-B UAT web display.
May 31 04:23:06 piaware skyview978[455]: Connecting to localhost:30978
May 31 04:23:06 piaware skyview978[455]: Connected to [::1]:30978
May 31 05:23:35 piaware skyview978[455]: Connection failed: End of file
May 31 05:24:05 piaware skyview978[455]: Connecting to localhost:30978
May 31 05:24:05 piaware skyview978[455]: Connected to [::1]:30978
May 31 09:58:35 piaware skyview978[455]: Connection failed: End of file
May 31 09:59:05 piaware skyview978[455]: Connecting to localhost:30978
May 31 09:59:05 piaware skyview978[455]: Connected to [::1]:30978
May 31 11:38:35 piaware skyview978[455]: Connection failed: End of file
May 31 11:39:05 piaware skyview978[455]: Connecting to localhost:30978
May 31 11:39:05 piaware skyview978[455]: Connected to [::1]:30978
May 31 21:48:36 piaware skyview978[455]: Connection failed: End of file
May 31 21:49:06 piaware skyview978[455]: Connecting to localhost:30978
May 31 21:49:06 piaware skyview978[455]: Connected to [::1]:30978
May 31 22:53:35 piaware skyview978[455]: Connection failed: End of file
May 31 22:54:05 piaware skyview978[455]: Connecting to localhost:30978
May 31 22:54:05 piaware skyview978[455]: Connected to [::1]:30978
Jun 01 00:58:36 piaware skyview978[455]: Connection failed: End of file
Jun 01 00:59:05 piaware skyview978[455]: Connecting to localhost:30978
Jun 01 00:59:06 piaware skyview978[455]: Connected to [::1]:30978
Was flooding heavy? Did you shut-off the valve to stop overflow? 
.
Your RPi is too slow for dump978-fa and dump1090-fa at the same time.
I have dump1090-fa turned off. I’m going running dump978-fa on a RPi Zero W.
That might well be too slow for dump978-fa.
soapy-sdr seems to use quite some CPU.
dump1090-fa is much better optimized.
Can any one tell what is the format of following output: raw, beast, decoded, or something else?
$ rtl_sdr -d 00000978 -f 978000000 -s 2083334 -g 48 -
Found 2 device(s):
0: Generic, RTL2832UFA, SN: 00000978
1: Realtek, RTL2838UHIDIR, SN: 00001090
Using device 0: Generic RTL2832U
Detached kernel driver
Found Rafael Micro R820T tuner
Exact sample rate is: 2083334.141630 Hz
[R82XX] PLL not locked!
Sampling at 2083334 S/s.
Tuned to 978000000 Hz.
Tuner gain set to 48.00 dB.
Reading samples in async mode...
Allocating 15 zero-copy buffers
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I believe it’s IQ format.
1 Like
Baseband I/Q samples, unsigned integers, 8 bits I + 8 bits Q.
It’s the direct output of the SDR with no further interpretation or demodulation. You need a demodulator (like dump978!) to do something useful with that data.
2 Likes
Thank you, Yes you are right!
pi@raspberrypi:~ $ rtl_sdr
rtl_sdr, an I/Q recorder for RTL2832 based DVB-T receivers
Usage: -f frequency_to_tune_to [Hz]
[-s samplerate (default: 2048000 Hz)]
[-d device_index (default: 0)]
[-g gain (default: 0 for auto)]
[-p ppm_error (default: 0)]
[-b output_block_size (default: 16 * 16384)]
[-n number of samples to read (default: 0, infinite)]
[-S force sync output (default: async)]
filename (a ‘-’ dumps samples to stdout)
