11-07-17 11:05 Richard Menedetter wrote to Ed Vance about Ham Radio Digital   
   Modes   
   Howdy! Richard,   
      
    RM> @MSGID: <5A01D8F7.1697.amtradio@capitolcityonline.net>   
    RM> Hi Ed!   
      
    RM> 06 Nov 2017 19:55, from Ed Vance -> Daryl Stout:   
      
    EV> I watch Television using a Digital TV Convertor box.   
    EV> While I was watching a show I noticed the image froze for a moment and   
    EV> I wasn't able to hear any sound until the freeze ended and thought   
    EV> about You using D-STAR, VOIP and maybe other Digital Modes for Amateur   
    EV> Radio.   
      
    RM> Correct.   
    RM> That is indeed a characteristic of digital encoding.   
    RM> You have a perfect signal until the error correction is not able to   
    RM> cope with the bit error rate.   
    RM> At that point you will have audio/video artefacts or even small outages   
    RM> (depending on the conditions).   
      
    RM> On an analog signal you will hear/see degradation much earlier, but you   
    RM> will have some form of very staticy signal that you may be able to   
    RM> decode when you have very bad conditions.   
    RM> On digital on those conditions you will have no service.   
      
   Would You know if Amateur Radio Digital Modes are affected by QRN or QSB?   
      
   That's what I'm wondering about.    Thanks!   
      
   73 de Ed, W9ODR .   .   
      
      
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