The best settings? Gain enz

FlightAware ADS-B Flight Tracking
1

I was wondering of somebody can see on the graphs from mine receiver what i can do to make it better.

I don’t understand the gain setting, but i read that the gain must be arround 30db
but as you can see, the gain is on 49.6
i have installed dump1090-fa, so there is an automatic gain, but is that the best.?
how can i disable the automatic gain, an add the gain manualy?

by the way, last week i have installed the flightaware filter, but i received not that many airplanes, so i have removed the filter again. last 5 days are without filter

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2

Looking at your range and message count you are already doing quite nicely with this setup.
Also the number of messages stronger then 3dbFS is stayin well below the aiming point of 5%. You have not a lot of aircraft with just one message so it seems you are set up quite nicely.

Setting the gain manually,it depends if you have the package installation or working with the SD card image installation

Automatic gain can be usefull but that might be to high to your liking.
Set the gain manually and wait 24 hrs to see if there is an improvement or a decline in your reception.
Don’t expect wonders, autogain checks once per hour to see if the value is still correct but it seems to be quite steady in your set-up.

Don’t you see any aircraft with the filter added ? It seems it filters out some noise in your graphs but the noise figure is already low

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

For the package installation

sudo nano /etc/default/dump1090-fa

Scroll down and change these two lines

RECEIVER_GAIN=60  -> Change this figure to to the number you want
ADAPTIVE_DYNAMIC_RANGE=yes  -> Change yes to no

then restart dump1090-fa

sudo systemctl restart dump1090-fa

For the SD card image

sudo piaware-config adaptive-dynamic-range no   

sudo piaware-config rtlsdr-gain (number you want to set)

sudo systemctl restart piaware  

sudo systemctl restart dump1090-fa
3

Your values are looking good. I would simply leave it as it is and enjoy feeding. Sometimes you got yourself lost in all these settings.

4

Thanks for the reply’s
Because both of you say that the graphs look good, i do not change anything for a while.
maybe i try it later to change the gain.

5

Depending on your equipment it doesn’t matter what you’re using.

Look at the values posted by tomvdhorst.
Simply pick and choose and let the value run for at least 24 hours.

I think you will not get any significant better.

6

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