[GreenKeys] Mark/space reversed ?

[Ralph Mowery]

I know that hams and the comercial rtty have been reversed on the mark/space.  I do not recall if I forgot why or have never seen the reason.  

Does anyone know the reason ?

DE KU4PT
  ----- Original Message ----- 
  From: George B. Hutchison 
  To: N4TTY at ARRL.NET ; greenkeys at mailman.qth.net 
  Sent: Saturday, May 26, 2012 11:00 AM
  Subject: Re: [GreenKeys] WLO Frequency?


  The WLO center Frequency is 8473.000.

  The transmitted frequencies are actually Mark = 8472.915, and Space 
  = 8473.085.

  It is a commercial-grade transmission thus mark and space carrier 
  frequencies are reversed as compared to  ham transmisions.

  W7TTY

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