[aprssig] APRS Speed Spec?
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Wed Oct 11 09:27:37 EDT 2017
I believe I have read everything that is locatable about APRS specs and
do not recall ever having seen these special speed values anywhere.
My question is: Why bother? When things are going that fast, they're
probably beaconing at a reasonable rate and the speed/heading can be
calculated between two adjacent beacons. At least satellites (and I
hope the Concord) don't turn that quickly.
Or are we trying to do APRS tracking of fighter jets in a live dogfight?
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
On 10/11/2017 8:48 AM, Robert Bruninga wrote:
> I thought that I had years ago declared that a speed of 999 would mean
> Orbital Velocity 17,500 MPH and that 998 would mean something else for
> high speed jets. Maybe mach 3?
> Actually I may have defined three speeds greater than 999 for the
> last three enetries.
> Clearly we need orbital velocity for the Space station, etc…
> And Mach 3 for our fighter pilots…
> And something for the Concord (or its replacement)…
> What about Elon Musk’s hypter tube? But I think it is under 999…
> Anyway, is this written down anywhere?
> And if not, then here is what I propose:
> 999 = 17500 MPH space station
> 998 = 1850 MPH military
> 997 = 1350 MPH concord
> 996 = 996 MPH
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