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Author Topic: Low reception ADS-B signal  (Read 7311 times)

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philippi

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Low reception ADS-B signal
« on: June 15, 2024, 02:00:34 AM »
Friends, I need some help.

I had some problems with my old Pi, and had to replace it. I used the same memory card. However, now I’m getting terrible results in my reception, where I can’t get more than , where 20/30 before reached 50/70NM. With that, I would like to check what I can do to try to improve my range or if I am having any other type of problem, either with the antenna or my ADS-B receiver

Antenna: Jetvision A3 ADS-B Antenna 1090 MHz
Receiver: RTL-SDR V3
Raspberry: PI 3 - Model B
The antenna is positioned over an open area.

My receiver details:
root@raspberrypi:~# rtl_test -t
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00001090
Using device 0: Generic RTL2832U OEM
Detached kernel driver
Found Rafael Micro R820T tuner
Supported gain values ​​(29) 3.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.
Reattached kernel driver

My configuration dump1090-fa

# dump1090-fa configuration
# This is sourced by /usr/share/dump1090-fa/start-dump1090-fa as a
# shellscript fragment.

# dump1090-fa won't automatically start unless ENABLED=yes
ENABLED=yes

# SDR device type. Use "none" for a net-only configuration
RECEIVER=rtlsdr
# serial number or device index of device to use (only needed if there is more than one SDR connected)
RECEIVER_SERIAL=
# Initial receiver gain, in dB. If adaptive gain is enabled (see below) the actual gain
# may change over time
RECEIVER_GAIN=60

# Adjust gain to try to achieve optimal dynamic range / noise floor?
ADAPTIVE_DYNAMIC_RANGE=yes
# Target dynamic range in dB (leave blank to autoselect based on SDR type)
ADAPTIVE_DYNAMIC_RANGE_TARGET=
# Reduce gain when loud message bursts from nearby aircraft are seen?
ADAPTIVE_BURST=yes
# Gain range to allow when changing gain, in dB (empty = no limit)
ADAPTIVE_MIN_GAIN=
ADAPTIVE_MAX_GAIN=

# Turn on options to reduce load on slower CPUs, at the expense of slightly worse decoder performance.
# Setting "auto" will enable these options only if the CPU appears to be a slow CPU (currently this
# means armv6 only, e.g. Pi Zero)
SLOW_CPU=auto
# Local wisdom file used to select DSP implementations; uses built-in ranking if the file is missing
WISDOM=/etc/dump1090-fa/wisdom.local

# Correct CRC errors where possible
ERROR_CORRECTION=yes

# Receiver location, used for some types of position decoding. Provide the location as
# signed decimal degrees. If not given here, dump1090 will also try to read a receiver
# location from /var/cache/piaware/location.env (written automatically by PiAware, if installed)
RECEIVER_LAT=
RECEIVER_LON=
# Maximum range, in NM. Positions more distant than this are ignored. No limit if not set.
MAX_RANGE=360

# Network ports to listen on for connections
NET_RAW_INPUT_PORTS=
NET_RAW_OUTPUT_PORTS=30002
NET_SBS_OUTPUT_PORTS=30003
NET_BEAST_INPUT_PORTS=30004,30104
NET_BEAST_OUTPUT_PORTS=30005

# Accuracy of location written to JSON output
JSON_LOCATION_ACCURACY=1

# Additional options can be added here:
EXTRA_OPTIONS=""

# If OVERRIDE_OPTIONS is set, only those options are used; all other options
# in this config file are ignored.
OVERRIDE_OPTIONS=""

# This is a marker to make it easier for scripts to identify a v6-style config file
CONFIG_STYLE=6

Any idea?

Runway 31

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Re: Low reception ADS-B signal
« Reply #1 on: June 15, 2024, 06:25:00 PM »
It may be that there is a phone mast nearby and you will need a filter to get better reception

Alan

philippi

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Re: Low reception ADS-B signal
« Reply #2 on: June 15, 2024, 09:59:16 PM »
Firstly, thank you for your response.

I don't have antennas nearby.
I can provide my antenna data through this graph1090 link. I can't see anything wrong...
https://cathartic-lizard-7381.dataplicity.io/graphs1090/

Runway 31

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Re: Low reception ADS-B signal
« Reply #3 on: June 16, 2024, 01:39:27 PM »
In urban areas reduction in reception is usaully due to interference with the most likely source phone masts

The range you get usually all comes from the antenna and how much it has a clear view of the sky and any obstruction to that view. Antenna hight is king so get it as high as possible but I note that your previous max was around 75 nm so I guess that your antenna location is quite limited

About the only thing software wise that could impact on range would I think be the gain setting, try it at 47 to see the result

Alan

abcd567

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Re: Low reception ADS-B signal
« Reply #4 on: June 16, 2024, 02:32:48 PM »
@philippi

Please post your results when you receive new dongle.

Ref: 
https://discussions.flightaware.com/t/low-ads-b-reception/93244/12

.
« Last Edit: June 16, 2024, 02:35:54 PM by abcd567 »

philippi

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Re: Low reception ADS-B signal
« Reply #5 on: June 16, 2024, 10:55:44 PM »
Yes, I will, I just ordered a RadarBox dongle, and will wait for its arrival. When I install it, I will post the results obtained.

Thank's

philippi

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Re: Low reception ADS-B signal
« Reply #6 on: July 01, 2024, 01:42:23 PM »
Sorted out.

After changing the USB receiver, I have good data again.

I appreciate everyone's support.