Raspberry Pi 3 B+ and USB Dongle R820T2 no flights recognized

[wiedehopf]

If you can see them then you should be receiving them easily.

If your dongle had an SMA connector and not MCX you could just use a piece of wire about 6.8 cm long and place it into the dongle.
With the MCX connector it's not easy to exclude the possibility of the antenna cable not being connected to the antenna anymore (internally).
(But the antenna is new and probably intact)

Does this aircraft list at least work for you (replace the IP address with that of you RPi)

http://192.168.1.55/dump1090/

The map can be changed like this: https://forum.flightradar24.com/thre...uot-Water-Mark
@abcd567 that thread can probably also use the remount command

Which power supply are you using for the RPi?
Maybe just try a different one, a phone charger with USB output for example.
Sometimes the USB receiver doesn't work properly with a weak power supply.

[abcd567]

pi@raspberrypi:~ $ sudo apt-get install rtl-sdr

W: Problem unlinking the file /var/cache/apt/archives/partial/.apt-acquire-privs-test.YAGcKX - IsAccessibleBySandboxUser (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - PrepareFiles (30: Read-only file system)
E: Failed to fetch .raspberrypi.org/debian/pool/main/r/rtl-sdr/rtl-sdr_0.5.3-11+rpt1_armhf.deb Could not open file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - open (30: Read-only file system) [IP: 93.93.128.211 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

I have now updated the post "Is My DVB-T RTL SDR Dongle Healthy? " and added command "sudo mount -o remount ,rw /" to make file system "read and write", with a note to use this command for PI24 image.

[Nomax2000]

I am in Addis Ababa with view on the landing planes. There shall be many planes. If I see them, I also should get the data.

I checked the thread on improving the antenna and shortened it.

[wiedehopf]

The antenna is three meters away from the raspberry and outside (dry place).
.

As i said check the thread on improving the antenna.

Normally there should be at least a couple of aircraft visible but if there is a lot of electrical noise or the antenna is blocked from the aircraft by hills or metal of any kind there is the possibility of receiving nothing.

I also don't know where you are located and how many planes pass by.

(After doing the tests you will have to start fr24feed again so that it is running: sudo systemctl restart fr24feed )

[Nomax2000]

I used the manual provided by Flightradar24:
Download Pi24 Image (ZIP, GZIP, MD5)
Download and unzip the file.
Download Etcher and follow the instructions given on the page.

I installed the image with etcher.

The antenna is three meters away from the raspberry and outside (dry place).

Thank you. Now I was able to do the test. The result seams fine:

pi@raspberrypi:~ $ rtl_test -t
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.

[wiedehopf]

And thank you Oblivian for unlocking the posts

[wiedehopf]

It is the bundle: ADS-B USB Dongle (R820T2) + Small Indoor Antenna

Please check this thread on improving this antenna (it has bad reception because it's for other frequencies)

https://forum.flightradar24.com/threads/9711-Optimize-the-Whip-Antenna-Which-Is-Supplied-With-DVB-T-Dongle

Also make sure that you place it higher than the Raspberry Pi and not too close to it, the RPi and it's power source cause electrical noise that couples into the antenna causing bad reception.

[wiedehopf]

Use this command, then start with the commands in the other thread again:

sudo mount -o remount ,rw /

(I'm still not sure when the pi24 sd-card image is mounted readonly. Did you just download it?)

[Nomax2000]

pi@raspberrypi:~ $ sudo apt-get install rtl-sdr
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
rtl-sdr
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 51.7 kB of archives.
After this operation, 172 kB of additional disk space will be used.
Err:1 archive.raspberrypi.org/debian stretch/main armhf rtl-sdr armhf 0.5.3-11+rpt1
Could not open file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - open (30: Read-only file system) [IP: 93.93.128.211 80]
W: Not using locking for read only lock file /var/lib/dpkg/lock
W: chown to _apt:root of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: chmod 0700 of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: Not using locking for read only lock file /var/cache/apt/archives/lock
W: Problem unlinking the file /var/cache/apt/archives/partial/.apt-acquire-privs-test.YAGcKX - IsAccessibleBySandboxUser (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - PrepareFiles (30: Read-only file system)
E: Failed to fetch .raspberrypi.org/debian/pool/main/r/rtl-sdr/rtl-sdr_0.5.3-11+rpt1_armhf.deb Could not open file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - open (30: Read-only file system) [IP: 93.93.128.211 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

[Nomax2000]

Sorry. I would like to. But this forum isn't allowing me to post links. Thus I can't write the error yet.

It is the bundle: ADS-B USB Dongle (R820T2) + Small Indoor Antenna

ADS-B RTL2832/R820T USB-Dongle
Indoor Antenna

pi@raspberrypi:~ $ sudo apt-get install rtl-sdr
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
rtl-sdr
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 51.7 kB of archives.
After this operation, 172 kB of additional disk space will be used.
Err:1 http://archive.raspberrypi.org/debian stretch/main armhf rtl-sdr armhf 0.5.3-11+rpt1
Could not open file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - open (30: Read-only file system) [IP: 93.93.128.211 80]
W: Not using locking for read only lock file /var/lib/dpkg/lock
W: chown to _apt:root of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: chmod 0700 of directory /var/cache/apt/archives/partial failed - SetupAPTPartialDirectory (30: Read-only file system)
W: Not using locking for read only lock file /var/cache/apt/archives/lock
W: Problem unlinking the file /var/cache/apt/archives/partial/.apt-acquire-privs-test.YAGcKX - IsAccessibleBySandboxUser (30: Read-only file system)
W: Problem unlinking the file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - PrepareFiles (30: Read-only file system)
E: Failed to fetch http://archive.raspberrypi.org/debia...rpt1_armhf.deb Could not open file /var/cache/apt/archives/partial/rtl-sdr_0.5.3-11+rpt1_armhf.deb - open (30: Read-only file system) [IP: 93.93.128.211 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

[wiedehopf]

I am using a USB Dongle with antenna from jetvision.

They have multiple antennas and multiple dongles, please be specific.

Anyway follow the guide linked above by abcd567 to first check if the dongle is working correctly.

Edit: Well if you want any helpful input on the problem, why don't you tell us which errors?

[Nomax2000]

It seems there is something wrong with my installation.

I gett error messages if I try to install sudo apt-get install rtl-sdr

[Nomax2000]

I am using a USB Dongle with antenna from jetvision.

[abcd567]

.
Is My DVB-T RTL SDR Dongle Healthy?

.

[wiedehopf]

What antenna are you using, how is it connected?

It looks like you are just not receiving any flights, that can have a number of reasons:

- Antenna not connected, connection faulty
- Really bad antenna
- Electrical noise blocking reception
- No planes in range
- Bad antenna position