[aprssig] System Fusion versus D-STAR, & APRS

Robert Bruninga bruninga at usna.edu
Fri Jan 9 10:02:18 EST 2015

> Digital radios, regardless of flavor,
>  have more features that don’t translate to analog
> such as embedded callsign in the data stream,
> clear voice or data.

But analog can have ALL of those too (most of the time).

1) Every APRS radio can embed its callsign (and location, called party, etc)
in a 100ms tone burst at the end of every PTT
2) Every APRS radio can send data
3) Every analog radio that is close to a repeater with good signal strength
can have clear voice.

What I have been wanting since 2000 is an "ASTAR" gateway and now a
"AFUSION" gateway.  These are simply a conventional ANALOG repeater on one
side which gets its callsign, position and connection request data from
APRS, and on the other side looks like a DSTAR or FUSION node.  Done.  The
analog side also delivers all network information to the fronmt panel
display showing who is talking, where, how far away, etc...

All the functions are there.  We just need someone with the tools to write
the gateway.  To see how it works, see http://aprs.org/avrs.html

Bob, WB4aPR

--------------original message-----------------

That’s not a slap to analog. Digital just has different and more features
decades later as you would expect. A major concern was mixing analog
repeaters with a wide variety of voice quality and signal quality (static,
noise) with a clearer, more consistent voice quality on digital.

For YSF, you’re not really mixing.  Except for the mode that everything
comes out FM, basically what you put in comes out the same way.  Many will
say it’s an advantage to allow FM users to operate analog and digital users
stay digital on the same repeater.  Others may think that’s a disadvantage
since FM users could hear the digital hiss/buzz unless their radio is set to
TSQ or DCS.  It will be interesting to see how many DR-1 repeaters operate
mainly FM or if digital use increases over time.

The discussion comparing modes has been very civil and informative in this
thread.  I hope we don’t degrade into bad mouthing one over the other.  Each
digital mode has its pros and cons and some are more suited for one
application or another.  I think it’s great that they all are developing
bringing new capabilities and new opportunities to learn about each in
Amateur Radio.


From: YaesuSystemFusion at yahoogroups.com
[mailto:YaesuSystemFusion at yahoogroups.com]
Sent: Thursday, January 08, 2015 6:35 PM
To: YaesuSystemFusion at yahoogroups.com
Subject: Re: [YaesuSystemFusion] Re: System Fusion versus D-STAR

Hi Kim,

Op 05-01-15 om 18:06 schreef kim at kim125.com [YaesuSystemFusion]:
I have never used D-Star, but here are some Yaesu System Fusion (YSF)
observations I have: (There are TONS more, but this is a start)

YSF Pros:
- YSF works out of the box. No need to assign special IDs to users/groups.
Great for new users.
- YSF natively supports analog and digital communications on the same
repeater/frequency, thus allowing all users (Digital/analog/all makes of FM
radios/etc.) to communicate together.
You know, when I was still working on D-STAR, I once started out on a system
that would allow mixing analog and digital voice.
I did have a system to go from digital to analog -something I used to stream
our repeater on the internet- not never finished the code to go the other
way around.

The reason was that, when I discussed about it on the different
mailing-lists, it was a big "no way". Allowing analog users to talk to users
on D-STAR would be the end of D-STAR. It would mean that people would not
have any reason to by an expensive D-STAR radio and simply stick to FM.
There where discussions on how to authentificate and identify analog users
on the digital network, on how provide tools to allow owners of repeaters
descide if they would allow incoming analog streams, issues with the
trust-service, etc. etc.
In the end, I moved to codec2 (much more fun)

So, it is very funny to see that, for some reason, now everybody seams to
say that "the ability to mix FM and YSF-users on one repeater is the best
thing since sliced bread" (or whatever the correct sentence is :-) )

So I guess, times have really changed since the times of i-com D-STAR
repeaters! (grin)

kristoff - ON1ARF
Posted by: John Davis <wb4qdx at arrl.net>
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