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f4exb / sdrangel

SDR Rx/Tx software for Airspy, Airspy HF+, BladeRF, HackRF, LimeSDR, PlutoSDR, RTL-SDR, SDRplay and FunCube
GNU General Public License v3.0
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Problem in ADS-B demodulator #1237

Closed mosta7il closed 2 years ago

mosta7il commented 2 years ago
  1. sampling rate problem: error message : Sample rate must be >= 2000000. Currently 64000. though I chose SR = 12 M
  2. No airplanes appear

  3. Is there any document which I can follow to make ADS-B works, Is there any restrictions on antenna connected to SDR

    Thanks in advance

srcejon commented 2 years ago
  1. sampling rate problem: error message : Sample rate must be >= 2000000. Currently 64000. though I chose SR = 12 M

This is referring to the baseband sample rate, which is set by the device sample rate and the decimation (Dec) setting. Which SDR are you using? If RTL SDR, set it's sample rate at 2,400,000 and Dec to 1. Perhaps attach a screenshot.

The SR setting in the ADS-B window is the channel sample rate - I'd recommend having that as 4.

No airplanes appear

They wont until baseband sample rate is >= 2MSa/s

Is there any restrictions on antenna connected to SDR

Not really - just one that works well at 1090MHz. I use one of these LNAs as well which helps: https://store.uputronics.com/index.php?route=product/product&product_id=50

mosta7il commented 2 years ago

Which SDR are you using? If RTL SDR, set it's sample rate at 2,400,000 and Dec to 1. Yes, I use RTL SDR set it's sample rate at 2,400,000 and Dec to 1. i set it as you say is there something i missed ? rd_angel this my used antenna image

srcejon commented 2 years ago

Try turning device gain up to maximum.

Set ADSB threshold to 5.

Under Preferences > My location set yor correct latitude and longitude.

Try with antenna outside withonly a short amount of cable to SDR.

mistergitj commented 2 years ago

I have found that even though I am in USA, I need to set my Longitude to a minus number to have home on the correct ADS-B Map. Thanks and enjoy, John.

EDIT: I am running 7.1.0.

srcejon commented 2 years ago

Yes, East and North are positive.

mistergitj commented 2 years ago

Thanks, srcejon. I always thought that West was positive. Enjoy, John.

srcejon commented 2 years ago

Only in America, as they say :)

Which probably explains why some s/w prefers to use E / W rather than + / -

github-actions[bot] commented 2 years ago

This issue is going to be closed due to inactivity