[aprssig] D-STAR vs. APRS

[AE5PL Lists]

Steve,

You can read about the D-STAR digital voice data stream at both the JARL
and Icom web sites.  In a nutshell: the 4800 bps GMSK data stream
consists of 3600 bps voice with FEC and 1200 bps data.  Yes, they do
transmit both at the same time.  It is this simultaneous transmission
that is used to send GPS information (D-PRS) while a person is talking
on the D-STAR radio.

73,

Pete Loveall AE5PL
pete at ae5pl dot net

> -----Original Message-----
> From: Steve Noskowicz
> Posted At: Sunday, September 23, 2007 6:36 PM
> Subject: Re: [aprssig] D-STAR vs. APRS
> 
>   Hold on a minute.  I thought one of the benefits of
> going to digitally encoded (vocoded) audio was that
> the vocoded voice requires less (digital) bandwidth
> thus you support data in REAL time at the SAME TIME
> because it is interleaved in the data streem.  Just

> parallel data capability.  If D-Star can't do that,
> then it is more marginal than I originally thought.