In a message on Tuesday 11-06-17 Ed Vance said to Daryl Stout:   
      
   Hi Ed,   
      
   I'm just busting in, not because I have any experience of digital Ham   
   Radio, but I have experience of TV.   
      
   EV> I watch Television using a Digital TV Convertor box.   
      
   Here called Digibox'es.   
      
   EV> I remember that back when Analog Television was being broadcast if   
   EV> the Picture messed up the sound portion could still be heard on   
   EV> those TV Sets   
      
   That is correct. The same was true with the so called digital channels   
   via Digiboxes.   
      
   Those old Digibox channels are now called analog and are still available   
   on modern TV sets, along with true digital and HD channels.   
      
   In most cases when the digital/HD signal becomes too weak to give a   
   picture, the sound also disappears. In rare cases there may be sound.   
      
   EV> One of the local Amateurs who owned a TV and Radio Repair Shop   
   EV> talked about taking courses and buying Test Equipment so He would be   
   EV> able to service Digital Television Sets when they needed any fixing.   
      
   There's no special test equipment needed, except a signal generator that   
   can give a digital TV signal, and in case you do service on antenna   
   distribution nets, a field-strength meter that is compatible with HD and   
   digital signals.   
      
   EV> Have You noticed if there any lapses or delays to the transmission   
   EV> that You are listening to when You're using any of those Digital   
   EV> Modes wheather during a QSO or You're SWL'ing the Band?   
      
   What I have noticed is that the more compressed a TV-signal is, the more   
   is the time delayed. Finnish TV hasn't noticed that or corrected it, but   
   swedish TV has.   
      
   The delay is only in the class of seconds but still irritating.   
      
   We did also have some "digibox" channels compressed with a MP4 compres-   
   sion, and even there the delay was greater than the uncompressed digibox   
   channels.   
      
      
   73 es GN de Sam, OH0NC   
      
   aka Holger   
      
      
   .. Terminate is now specially built for Internet!   
   -- MR/2 2.30   
      
   --- PCBoard (R) v15.22 (OS/2) 2   
    * Origin: Coming to you from the Sunny Aland Islands. (2:20/228)