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Archive for December, 2012
Posted by SoaringDude | Dec 22, 2012 @ 01:14 AM | 3,808 Views
While the number of RC flying fields that are close to a NEXRAD weather radar site are small, I know from RCG searches that there are at least several others that have suspected radar interference problems.

I just posted an article on my soaring club's RCG forum here that explores how the NEXRAD radar works and when/why RC interference might result.

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January 6, 2013 Update:

Several days after my original NEXRAD post on our club forum I received a nice email from club member Jonathan Heritage offering some great feedback. In it he suggested that using the Friis Transmission Equation we might get a better idea of how closely we could fly to the NEXRAD radar ball before our 2.4gHz receivers get swamped out from the high power radar pulses. After running some quick numbers Jonathan's well-reasoned conclusion was that our planes should be safe as long as we don't get too close. Since we aren't seeing very many control issues in that quadrant of the sky he's no doubt right.

I decided that it would be helpful to build a spreadsheet that implemented the Friis equation and then apply it at various points on our flying field. The basic idea was to calculate how much NEXRAD power would be received at a plane's 2.4gHz receiver antenna terminals compared to our RC transmitter signals.

So here's the net conclusion from this analysis. At the worst possible field location point "I" (i.e. farthest from where pilots stand with their...Continue Reading