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[aprssig] K6RPT-12 Balloon Track

Jeff Dugas N5TEV at CompuServe.com
Tue Dec 4 05:28:36 UTC 2012


>Jeff,
>  Thanks for making me revisit that.
>and... Why is Iceland green and Greenland ice...?  What's with that?

>73, Steve, K9DCI 

No problem.  I worked radar systems in the Air Force for 26 years, so
conversations involving RF "distance to horizon" wake me up.

In watching the balloon radio range circle on aprs.fi, I still remember:
Distance to Horizon(Nm) = Sqrt(1.23 x Alt(ft))

And then we used to add refractive index adjustment, which involved using a
sling psychrometer to obtain relative humidity; calling nearest AF Weather
station to get barometric pressure; and charting the values on a table in
the Radar Tech Manual to apply the correct settings to the radar.  Old
analog radars, of which a few were still in operation in the 1980s.

And, BTW  when I was stationed in Iceland, the locals said that the Vikings
swapped the descriptions (names) of Iceland and Greenland to steer other
would-be settlers away from the Viking's desired location (Iceland).  Don't
know if that's a historical legend or not.  :-)

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