7 ms·

Not quite all aircraft are required to have ADS-B in all situations, there are a number of edge cases out there. But close enough, I suppose, and most planes pe

Not quite all aircraft are required to have ADS-B in all situations, there are a number of edge cases out there. But close enough, I suppose, and most planes people would want to track are required to have it. However, there's also a new privacy initiative that allows aircraft to fly under temporary ids. The FAA will still know who they are, but for 3rd parties it will become much more difficult to determine. https://www.aopa.org/news-and-media/all-news/2019/december/24/ads-b-privacy-now-available https://www.aopa.org/news-and-media/all-news/2019/december/2...

AWildC182 7y ago
Good points all around. I figured the exceptions were esoteric enough to not bother with immediately but are very valid. I'm interested in seeing where the proposal goes. I'm not sure where I stand on the issue but I'm curious of others opinions.
ianburrell 7y ago
Also, the US allows using UAT on 978 MHz for ADS-B requirement for planes below 18,000 ft. Most SDRs only decode 1090 MHz signal. It is possible to decode 978 MHz but requires more work to support both.
- superkuh 7y ago
  I know what you mean, you mean the software for SDRs is mostly geared towards tuning to 1090 MHz and decoding ADS-B pulses there. But to be clear: the SDR's tuners are rarely limited that way. Most can tune to 978 MHz even easier than 1090 MHz. Covering the entire VHF to UHF range is pretty typical.
  - crankylinuxuser 7y ago
    When I've set up P25 receivers, it's common to use 2-4 RTL-SDR's to do the bulk of listening. Each rtl-sdr gets set with a different center freq, and the control channel tells when and where to listen. You can build a P25 listener for less than $100.
    - someguydave 7y ago
      which software do you use to demodulate P25? gnuradio?
      - crankylinuxuser 7y ago
        I use https://github.com/robotastic/trunk-recorder https://github.com/robotastic/trunk-recorder You'll use https://www.radioreference.com https://www.radioreference.com and get the appropriate control and voice channels for your area. You'll also get the talkgroups and put them in a CSV. From there, you'll use http://garvas.org/trunk-recorder/ http://garvas.org/trunk-recorder/ to determine how many RTL-SDR dongles (or others) you'll need, along with their respective center frequencies. Note that you'll copy/paste the relevant control/voice line for your p25 from radioreferece.com From there, just define where to store the files on the drive, and off it goes. There's a python webserver ( https://github.com/ScanOC/trunk-player https://github.com/ScanOC/trunk-player ) you can install for on-prem, and/or you can also upload it to openmhz website ( https://github.com/robotastic/trunk-recorder/wiki/Uploading-to-OpenMHz https://github.com/robotastic/trunk-recorder/wiki/Uploading-... ).
        prashnts 7y ago
        Not OP, but thank you! I recently got a SDR dongle and was going to set it up. This will help.
- zymhan 7y ago
  Not difficult at all: https://www.adsbexchange.com/how-to-feed/adding-978-mhz-ads-b-capability-to-your-pipi2/ https://www.adsbexchange.com/how-to-feed/adding-978-mhz-ads-...
ATsch 7y ago
I hope not. Unlike car license plates, if you own a plane what you're doing with it is very much in the publics interest to know, especially if you don't want people to know. They can have their privacy while they aren't flying polluting multi-million dollar planes through the country and above our buildings.
- dvtrn 7y ago
  Private Crop dusting pilots flying over cornfields in southern Nebraska aren’t flying over your buildings mate.
  - ATsch 7y ago
    Private Crop dusing pilots aren't trying to hide themselves from the airplane maps, so this is irrelevant to the point.
    - dvtrn 7y ago
      I would beg to differ and could probably accurately guess that several ag pilots I know would as well.
    - tjohns 7y ago
      I'd say they're more likely to be hiding themselves from the map than your average commercial flight. Pilots of small aircraft are just as sensitive about giving up their privacy as anyone else. Would you want your name, address, and position broadcast on the internet every time you get in your car?
      - dvtrn 7y ago
        Not just sensitive about their privacy, but there is a particularly ornery set of opinions among rural pilots regarding the government “telling me how to tend my own farm” which I think is at the root of what we see at the surface as being “privacy concerns”. So when someone says these types of aviators aren’t trying to hide themselves I’m highly skeptical on just how well-versed the speaker is with the issues and perspectives this class people have with more and more expensive operating requirements being put on them with diminishing returns for their compliance. Then again, this perspective isn't in line with "rich moguls and their private personal jets" and represents a blue-collar voice that gets left out of discussions in this community with a frustrating frequency; so I'm really not surprised, either. Hell go talk to some ground-based truckers how they feel about having their routes tracked by logistics companies who book them for loads. There’s videos all over YouTube from long haul truckers complaining about faceless entities demanding they install tracking systems or download GPS enabled apps and the constant complaint is “don’t tell me how to drive my truck" These operators want autonomy.

AWildC182 7y ago

Good points all around. I figured the exceptions were esoteric enough to not bother with immediately but are very valid. I'm interested in seeing where the proposal goes. I'm not sure where I stand on the issue but I'm curious of others opinions.

ianburrell 7y ago

Also, the US allows using UAT on 978 MHz for ADS-B requirement for planes below 18,000 ft. Most SDRs only decode 1090 MHz signal. It is possible to decode 978 MHz but requires more work to support both.

superkuh 7y ago
I know what you mean, you mean the software for SDRs is mostly geared towards tuning to 1090 MHz and decoding ADS-B pulses there. But to be clear: the SDR's tuners are rarely limited that way. Most can tune to 978 MHz even easier than 1090 MHz. Covering the entire VHF to UHF range is pretty typical.
- crankylinuxuser 7y ago
  When I've set up P25 receivers, it's common to use 2-4 RTL-SDR's to do the bulk of listening. Each rtl-sdr gets set with a different center freq, and the control channel tells when and where to listen. You can build a P25 listener for less than $100.
  - someguydave 7y ago
    which software do you use to demodulate P25? gnuradio?
    - crankylinuxuser 7y ago
      I use https://github.com/robotastic/trunk-recorder https://github.com/robotastic/trunk-recorder You'll use https://www.radioreference.com https://www.radioreference.com and get the appropriate control and voice channels for your area. You'll also get the talkgroups and put them in a CSV. From there, you'll use http://garvas.org/trunk-recorder/ http://garvas.org/trunk-recorder/ to determine how many RTL-SDR dongles (or others) you'll need, along with their respective center frequencies. Note that you'll copy/paste the relevant control/voice line for your p25 from radioreferece.com From there, just define where to store the files on the drive, and off it goes. There's a python webserver ( https://github.com/ScanOC/trunk-player https://github.com/ScanOC/trunk-player ) you can install for on-prem, and/or you can also upload it to openmhz website ( https://github.com/robotastic/trunk-recorder/wiki/Uploading-to-OpenMHz https://github.com/robotastic/trunk-recorder/wiki/Uploading-... ).
      - prashnts 7y ago
        Not OP, but thank you! I recently got a SDR dongle and was going to set it up. This will help.
zymhan 7y ago
Not difficult at all: https://www.adsbexchange.com/how-to-feed/adding-978-mhz-ads-b-capability-to-your-pipi2/ https://www.adsbexchange.com/how-to-feed/adding-978-mhz-ads-...

ATsch 7y ago

I hope not. Unlike car license plates, if you own a plane what you're doing with it is very much in the publics interest to know, especially if you don't want people to know. They can have their privacy while they aren't flying polluting multi-million dollar planes through the country and above our buildings.

dvtrn 7y ago
Private Crop dusting pilots flying over cornfields in southern Nebraska aren’t flying over your buildings mate.
- ATsch 7y ago
  Private Crop dusing pilots aren't trying to hide themselves from the airplane maps, so this is irrelevant to the point.
  - dvtrn 7y ago
    I would beg to differ and could probably accurately guess that several ag pilots I know would as well.
  - tjohns 7y ago
    I'd say they're more likely to be hiding themselves from the map than your average commercial flight. Pilots of small aircraft are just as sensitive about giving up their privacy as anyone else. Would you want your name, address, and position broadcast on the internet every time you get in your car?
    - dvtrn 7y ago
      Not just sensitive about their privacy, but there is a particularly ornery set of opinions among rural pilots regarding the government “telling me how to tend my own farm” which I think is at the root of what we see at the surface as being “privacy concerns”. So when someone says these types of aviators aren’t trying to hide themselves I’m highly skeptical on just how well-versed the speaker is with the issues and perspectives this class people have with more and more expensive operating requirements being put on them with diminishing returns for their compliance. Then again, this perspective isn't in line with "rich moguls and their private personal jets" and represents a blue-collar voice that gets left out of discussions in this community with a frustrating frequency; so I'm really not surprised, either. Hell go talk to some ground-based truckers how they feel about having their routes tracked by logistics companies who book them for loads. There’s videos all over YouTube from long haul truckers complaining about faceless entities demanding they install tracking systems or download GPS enabled apps and the constant complaint is “don’t tell me how to drive my truck" These operators want autonomy.