On Thu, Dec 17, 2009 at 1:25 PM, James Turner wrote: > > On 17 Dec 2009, at 18:44, Curtis Olson wrote: > > > I don't have personal knowledge of what is correct, but this change to > glideslope range impacts our ability to practice ILS approaches and I have a > current King Air pilot complaining about the behavior. Pulling out some old > approach plates for KMSP here I see a 14nm distance and 5000' MSL entry > altitude (4000'+ AGL) referenced in the approach to 30R. Is 7-8 miles a > realistic range for the glide slope? Is my King Air pilot contact smoking > something? > > Personally, I agree our ranges are very short, however, I *believe* the > navradio code is respecting the range specified in nav.dat (often 10nm as > you point out). If the code isn't respecting the published range, that's a > bug, almost certainly mine, and I'll fix it ASAP. > > There is a separate issue about whether the GS receiver ought to receive a > signal beyond the published range, eg a 20% or 30% margin above what is > published. There are arguments against doing that, and arguments for it, and > personally I'm not sure. When you look at many approach plates, the GS > volume is often quite short. >
Hi James (Hi John), I will try to get a more detailed bug report. As I've been looking more closely here, I am seeing the glide slope come alive right at 10nm on the two approaches I have tested, which would mean that the code appears to be doing what we ask of it, since most of the glide slope transmitters are marked as 10nm range. Curt. -- Curtis Olson: http://baron.flightgear.org/~curt/
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