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  #11  
Old 08-20-2015, 08:59 AM
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Mike S Mike S is offline
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Quote:
Originally Posted by Mousse View Post
I wish I had the technical knowledge to built something like this.
I wish I knew what the original doc was even saying

https://www.reddit.com/r/flying/rela...ght_or_pretty/
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  #12  
Old 08-20-2015, 09:47 AM
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Quote:
Originally Posted by Mike S View Post
I wish I knew what the original doc was even saying

https://www.reddit.com/r/flying/rela...ght_or_pretty/
I'm only kind of techy but this looks like an easy one. Plug all the stuff together, install the image file on the micro SD card, plug it in and power it up.

We'll see how true that all is when UPS delivers the stuff tomorrow.
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  #13  
Old 08-20-2015, 11:00 AM
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Quote:
Originally Posted by boom3 View Post
I'm only kind of techy but this looks like an easy one. Plug all the stuff together, install the image file on the micro SD card, plug it in and power it up.

We'll see how true that all is when UPS delivers the stuff tomorrow.
Basically correct. The guy working this seems to be doing his best to make it easy. There is an updated reddit as well that I will put in my original post but all the parts in the his original post.

EDIT: Latest info from the author that makes the process easier:

https://www.reddit.com/r/flying/comm...ght_or_pretty/
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Last edited by Raymo : 08-20-2015 at 11:05 AM.
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  #14  
Old 08-20-2015, 11:13 AM
humptybump humptybump is offline
 
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Friendly Warning: the authors instructions (and the latest img) are a great jumpstart. However ...

It assumes you buy exactly the pieces he links. I have a common but different wifi dongle it is does not work "out of the box". I'm having ot recompile a number of pieces. I should have it all working by the end of the day. (infamous last words)
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  #15  
Old 08-20-2015, 11:52 AM
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Mark Dickens Mark Dickens is offline
 
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You don't have to assemble all the software yourself. Just download the finished image file from https://github.com/cyoung/stratux/releases and copy the image file to your chip using Win32DiskImager (https://www.raspberrypi.org/document...ges/windows.md), insert into your assembled Raspberry Pi, attach your wifi chip and SDR dongle, and away you go. Took me maybe 15 mins.
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  #16  
Old 08-20-2015, 01:15 PM
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One thing to be aware of with the digitizer dongles is that the sensitivity of these devices is much lower than for dedicated designs. These USB sticks are meant to pick up TV stations that output 1,000,000 watts from 30 miles away, while an ADS-B ground station is 250 watts and can be 100+ miles away.

The dedicated designs like a Stratus, the Garmin GDL-39, or the Dynon ADS-B box have incredible sensitivity because they are specifically tuned to receive only the frequency they are designed for. SDR boxes like the USB TV sticks inherently need to have huge front end bandwidth, which hurts selectivity and sensitivity.

You may easily find that the SDR ADS-B works fine 30 miles away from the ADS-B ground station, but not the 200 miles that a specialized receiver can do.

Now, clearly I'm biased because I work at Dynon and we like our ADS-B box a lot. This sounds like a fun project. Just don't judge the coverage and performance of the ADS-B system based on one of these receivers.

--Ian Jordan
Dynon Avionics
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  #17  
Old 08-20-2015, 01:55 PM
humptybump humptybump is offline
 
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Hi Ian,

I don't think any of us are [sufficiently] delusional to believe the SDR+RPi is "the same thing" as a Stratus or GDL39 (as least I'm not )

At the same time, this project fits nicely with the experimental nature of our operational domain.

Quick update: I recompiled the necessary modules to get the RT5370 based wifi dongles to work. My ground tests successfully connect with ForeFlight (but obviously I am not receiving any weather data).

The local offer still stands for anyone who wishes to test flit this weekend.

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  #18  
Old 08-20-2015, 02:07 PM
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Agree. Fun project to play around with and maybe pick up weather (if close enough to the airport) and traffic overhead while working.

Others have flown with these and found that they have to get a good bit higher (3000+ ft AGL) compared to their *real* ADS-B device that might pick up stations at lower altitudes (500 ft AGL).
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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  #19  
Old 08-20-2015, 03:06 PM
xavierm xavierm is offline
 
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Default works

Haven't flown with it yet but it works good with ForeFlight on the ground.
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  #20  
Old 08-20-2015, 03:23 PM
humptybump humptybump is offline
 
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Xavier, when you say "works good on the ground" can you provide some details an what info/data/statistics you are seeing?
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