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[aprssig] [Xastir] question on weather setup

Robert Bruninga bruninga at usna.edu
Mon Dec 1 17:52:03 UTC 2008


Regarding Emergency Power symbol overlays:

>> 5- = 50 Hz mains power
>> 6- = 60 Hz mains power
>  
> ... why the need for this distinction? 

Probably none.  And not expected to be used in 99.9999% of all
applications, but if someone needed to indicate it for some
special reason, then there is a symbol for it.  I think this
came about when looking at all the possible types of "emergency"
power systems.  And doubtful that "5" or "6" wouild be used for
anything else...  So why not make it available.

Maybe a guy operating a 60 Hz system surrounded by 50 Hz mains
might need to indicate his power source during an emergency?




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