[Scan-DC] Map of ACARS position reports

[Andrew Clegg]

Did you mean km instead of nm? 300 nm is 556 km or 345 miles, which corresponds to a 4/3 earth radio horizon for a plane at over 50,000 ft. No commercial planes fly that high, and I doubt you're routinely getting over-the-horizon propagation at 1 GHz, so I'm not understanding how you can be receiving ADS-B over that distance. Thoughts?

> From: jmhayes at j-o-r-d-a-n.com
> To: scan-dc at mailman.qth.net
> Date: Sat, 2 Apr 2016 09:47:34 -0700
> Subject: Re: [Scan-DC] Map of ACARS position reports
> 
> > It's unlikely to get 400+ km at 900 MHz (free space loss is
> > 17 dB more than at 130 MHz), but it will be interesting to see.
> 
> All I can say is try it and see; I routinely see ADS-B hits out to 
> 300nm.
> 
> /jordan 
> 
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