[aprssig] APRS Speed Spec? (plan B)

Robert Bruninga bruninga at usna.edu
Wed Oct 11 09:15:32 CDT 2017


My head hurts trying to read the Mic-E spec as written.

Also, I screwed up MPH and KTS in last email…

So here is what I am suggesting for the CSE/SPD field:



999 = 15,200 knots space station

998 =    1600 knots military mach 2.8

997 =    1200 knots Concorde

996 =       996 knots normal speeds down to 0



So using this same idea for Mic-E would result in



789 = 15,200 knots space station

788 =    1600 knots military mach 2.8

787 =    1200 knots Concorde

786 =       996 knots for consistency with above

785 =       785 knots normal speeds down to 0



Any objections?  About the only one we will ever use is the orbital
velocity for the space station and for satellites, but I thought we may as
well include a few more.



Bob, WB4APR





*From:* Robert Bruninga [mailto:bruninga at usna.edu]
*Sent:* Wednesday, October 11, 2017 8:48 AM
*To:* TAPR APRS Mailing List
*Cc:* Robert Bruninga
*Subject:* APRS Speed Spec?



Authors,

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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