Subj : Ham Radio Digital Modes
To   : Richard Menedetter
From : Ed Vance
Date : Thu Nov 16 2017 05:10 pm

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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