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ADSL & DRM
By: Robin Page-Jones. G3JWI
As presented to the Vange Amateur Radio Society 16th Mar 2006

• Asymetric digital Subscriber Line is the correct term for Broadband
• Basic connection is OK up to 45Km and operates at 1.1 MHz Max.
• The new enhanced 8 Meg connection works up to 3Km typ' from Exch'
• The new VDSL system works at 10 - 12 MHz,
  but is 'notchable' for Amateur band frequencies.
• A measure of the quality of the connection can be made by
  comparing the Differential mode power to the Common mode power.

              
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• Digital Radio Mondial
• This is Digital worldwide radio
• It offers Digital quality audio on Short and Medium wavebands
• It utilises the standard channel spacings of 9/10 KHz
• and uses a technique called: ODFM - Orthogonal Digital Frequency Modulation.
• Although transmissions are intended for test purposes,
  and there are no commercially built receivers available,
  it is possible to modify an existing radio with a 12KHz IF
  so it can be decoded using a standard PC with a soundcard.