Recent content by AnirbanSen

  1. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    Replacement installed: About 30% more airplanes. Studying the changes.
  2. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    I think that was it. Wonder how it suddenly kicked it. Was a month ago I was testing that. I also wonder why there is a huge difference between 49.6 and AGC. Signal is almost 4 times the strength at AGC.
  3. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    A replacement ticket has been created. Hopefully the new one will arrive in 3-4 weeks. In the meantime, a new problem has emerged: It appears that around 2am everyday, the signal falls off. The gain in dump1090-fa settings changes from -10 to 49.6. It remains that way till I change the gain back...
  4. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    Pretty weird. Set at 1080Mhz. I've emailed rtlsdr admin. Let's see what he suggests.
  5. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    The spectrum is here: https://forum.planefinder.net/threads/do-you-need-a-filter-find-out-rf-signals-affecting-ads-b-reception-in-your-area-cell-mobile-etc.1027/post-8752 It can, but everything is soldered up. I'll check this in a day or two. But as per the spectrum, it is working fine. Then...
  6. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    The first section is the inline amplifier. The second section is the rtl-sdr LNA. Been using at AGC. Also noticed huge > 3dBfs signal. Reducing gain to 32/20 did not increase the number of airplanes or range. Cannot measure LNA current presently. See the heatmaps here. I've updated the post...
  7. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    1) I double checked the SMAs and it appears fine. In fact, the same setup had been operating on the inline amplifier (20dB). I also double checked the connectivity between the lead/radials and the F connector entering the lightning protector. 2) Switching off the voltage DOES NOT change the...
  8. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    Supplying about LNA is about 1m aware from antenna on roof. And supplying about 4.52V through the Bias T. Voltage is about 4.39V at the roof.
  9. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    1) Removed the knitting needle 2) Removed the Bias-T/DC Block from the front end of the LNA No change. See the drop in range from the inline amplifier to the RTLSDR amplifier:
  10. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    1) I cannot discount the possibility that this vandal is some large bird trying to sit on the antenna or on the mount and fiddling with the antenna. 2) I took a long sewing needle (the long ones used to knit wool) and taped it with the last length of the RG6 almost till 1mm of the radials...
  11. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    I have some spare cam to monitor my cat remotely. But power and weather proofing is an issue. Rains have not fully subsided.
  12. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    You think the current off the bias t is sufficient? Cameras operate around 1A when using IR.
  13. AnirbanSen

    Trial Run Results for Three Types of Whip Antennas

    Just reporting: There was a small thunderstorm today. As soon as the rains started, I found the signal going off completely. The 1/4 wave ground plane was again on its side which is most likely the handiwork of a vandal. I wonder who it is since it requires the ability to climb ladders and...
  14. AnirbanSen

    Changes to Planefinder Website?

    I wish they would share some data with us, and allow local processing. I have generally noticed that certain airlines and specifically certain aircrafts show up much before on the feed than other planes always flying the same route and at the same altitude. Some aircrafts show up at least 50 nm...
  15. AnirbanSen

    Changes to Planefinder Website?

    Speaking of plotting and analysis of data, what about deep analysis of ADS-B data? i) At what altitude and what azimuth is the visibility of a receiver? ii) Which aircrafts travel often over the site and how far are they visible (suggesting that transmitters on some crafts are more powerful)...
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