I have not posted in a while, But just recently I set up a second site at my parents house and am a bit confused on the results im getting.
A bit of background.
My home set up is a pi4 with a blue FA stick and LNA with a 1090 bought antenna in my loft. I am pulling in on average over 500.000 positions a day, with 2000+ aircraft reported. On graphs 1090 I am running about 5.8% -3dBFS so all good there.
My second (new) set up is a pi4 with a orange FA stick and a LNA with a 1090 bought antenna but this one is outside with no close by obstructions. It is only pulling in around 300.000 positions a day with around on average 1800+ aircraft reported. on graphs 1090 im on about 4.0% -3dBFS
I will say that the second set up that has the outdoor antenna is only about 4 meters off the ground but with the clear view if the sky I was expecting a lot better.
But today i was looking at 1090 graphs and noticed that the Bandwith looks very different to my home set up.
Has anyone got any thought’s on why my incoming is a lot higher than my outgoing data ?
Still trying to understand what is happening here and the poor performance.
I had the new setup running at my house with the antenna sat on in my window and was perfectly fine. I shut the pi down moved it 7miles away and turned it on at my parents house.
So it the only thing to change is the location and WiFi
The new set up is in a out house and on the limit of the WiFi
Could that cause a lower message rate ?
Please guys any advice
I also have put a 1090 blue filter on to no avail.
Appears you are connecting wireless to your Rpi installations. Have you measured significant performance differences between the home and the new site wireless ethernets?
Antenna height and local obstacles could be the biggest factor in your message rates. Also, if you are remotely logging into the system, those messages might conflict with the ADSB messages.
The command to the Pi:
iwconfig wlan0
should give you the transmit and RECEIVE power on the Pi.
Here is what I receive on a WIFI connected Pi,
wlan0 IEEE 802.11 ESSID:“xyzzy”
Mode:Managed Frequency:2.462 GHz Access Point: A2:04:xx:xx:xx:xx
Bit Rate=65 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=49/70 Signal level=-61 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:4822 Invalid misc:0 Missed beacon:0
The Signal level tells you the strength of the signals from your router to the Pi in the Out house. Link Quality takes into consideration noise and speed. 49 is ok, higher is much better. That may give you an idea of how you are connecting to the Pi. Excess retries implies local wifi interference, likely a microwave oven or other wifi conflicts.
On the router, you may be able to see the transmit link quality and level associated with the Pi.
Both levels are important. Walls, brick, and any metal objects between the router and the Pi will mess up things.
Gotta admit, interesting location for a receiver, at least a place to set down while adjusting things. And no jokes at all about a crappy place to run a system. Gotta admit, a outhouse with power is a good thing in the winter. Don’t ask me how I know this.
It’s most likely just the location.
The graphs that show the old location + the new location is what i meant by the way … so possibly 7d? 14? view.
You didn’t specify if the antenna was indoors.
Indoor antennas have unpredictable reception from even small location changes in the same room.
Only antennas overlooking the entire structure have predictable performance.
It sounds like trees could be in the way of the view, possibly a house?
Clear view of the horizon is the relevant part, the lower the horizon the better.
Clear view of the sky is a bit misleading terminology possibly.
Right. I have a great view of the sky by my house (and it will be even better when I can get my antenna about 10 feet higher), but there’s a low ridge to my North and East that limits my range in those directions. I’d have to have a 50-foot tall antenna to get any appreciable increase in range to my North and East.
