[digitalradio] What is an image and what is data

Sun, 15 Oct 2006 05:51:40 -0700

The answers to these questions about what is an image is simple in one respect.  The current FCC rules allow digital emissions throughout the 160 through 10 meter bands.  This is true because emissions that have a 1 or a 2 as the second symbol of the emissions designator are allowed everywhere.  It is the content of the digital emissions that is segregated, and this is the third symbol.  So if the content of you message is data, then the emission that you are using had a D as the third symbol.  If the content of your emission is an image then the third symbol is a C.  If the content of your message is telegraphy for automatic reception, then the third symbol is a B.  What is telegraphy?  Telegraphy in this case is defined in part 2 as: 
a
form of telecommunication for the transmission of written matter by the
use of a signal code.  Facsimle is also a form of telegraphy, but is
for the transmission of images.  

What is complex is capturing an emission and determining if it is an
image or data.  Win DRM is a good example.  You can send F1D
and F1C with WinDRM, but unless you decode it, you cannot tell from the
emission whether it is an image or data.
73,

Mark N5RFX  __._,_.___

Need a Digital mode QSO? Connect to  Telnet://cluster.dynalias.org

Other areas of interest:

The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/
DigiPol: http://groups.yahoo.com/group/Digipol  (band plan policy discussion)




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