This morning I woke up and I had the surprise to look outside and see the ADS-B antenna cable laying on the grass. I examined the end and the end wasn’t broken, just somehow unscrewed itself from the amplifier output and fell. I could see some traces of water ingression too in the head, I guess it was a slow process.
I figured out that it was my fault, when I raised the antenna, I have left the antenna cable dangling down under it’s weight, supported by the connector. Bad. I should had made a loop to support the cable weight.
Luckly today is very warm outside, 70F (21C) at 9AM.
So I took the antenna down to reconnect the cable and, with that occasion, to replace my no-name amplifier with the “RTL-SDR Blog ADS-B filtered” one that was waiting in my drawer for a few months.
This LNA requires lower voltage than my previous one (that had incorporated stabilizer), so I set my power supply to 4.5V.
The caulking that I had before on the bottom holes of the box became a brittle dust, even if it was “silicon” based.
I did clean the connector with some isopropyl alcohol and added the supporting loop.
Checked the antenna functionality at ground level and… it works! Up on the tree it goes!
The results are somehow disappointing. The gain of the new LNA is lower than the gain of my previous no-name one. With my FlightFeeder I had to go from 12dB to 33dB! With my Airspy R2 I was already at 21, so… can’t go higher.
Maybe when I feel less lazy I will try to trow a paracord over a higher branch…