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Author Topic: APRS or D-Star Poll  (Read 1026 times)
WA4D
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Posts: 99


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« on: May 04, 2008, 04:08:11 PM »


APRS and D-Star share some similar features. Kenwood has endorsed the APRS model while Icom is full bore behind D Star.

I've been wondering what hams are thinking about these two modes.

I put up a quick poll on my web site. Click to Vote please.

http://www.wa4d.net

OR

http://mewcomm.typepad.com/wa4dnet/2008/05/poll-which-digi.html


Thank YOU
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KC7ZRU
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Posts: 29


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« Reply #1 on: May 13, 2008, 07:25:21 PM »

Comparing APRS to D-Star is about like comparing CW to ASCII.

APRS is a tactical system designed for situational awareness. MUCH more than just vehicle tracking. It also doesn't handle voice or 'other' data at all.

D-star is a system that carries voice and data - it can transmit vehicle positions as any other data, but it does so much more than APRS can do. It's not really a fair comparison at all. Not quite an Apples and Bowling Balls thing, more of an Oranges and Bananas deal.

Your comparison appears to either radically under estimates D-star or over estimates APRS.
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KC0VCU
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Posts: 138




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« Reply #2 on: June 12, 2008, 03:07:43 AM »

Actually it does handle some data, people have used it to pass short messages back and forth.

However it is not a method of communicating voice, and from what I can see at the moment does not have any support for data rates faster than 9600kbps.

Granted to get higher data rates than that in D-Star you have to go to 23cm, but it's very doable.

If DVSI ever decides to release the complete specification for AMBE (the voice mode codec used in D-Star) then you may see more people interested in using D-Star as a voice mode, and data mode digital platform. As it stands the license declares the information within the documentation to be proprietary.

Since no one has reverse engineered the codec, (yet) that means that the only people who can use or listen to voice transmitted via D-Star are people who buy the chip that does the decoding (or related software) from DVSI or a licensee. This is somewhat unusual in the amateur universe as it means that for 'random' users the content of the conversations is 'hidden' or 'obscured' which many people consider counter to the regulations surrounding amateur radio.

That said, I don't see any rush to buy products that use competing codecs in the amateur community. Commercial radios are available using APCO-25, though not a lot that you or I would consider 'reasonably priced' for the community. That said $1000 for a ID-1 seems a bit steep as well. Though there are a lot of even more expensive rigs that people use all around the world.

It's a bunch of arguments that have been fought over for years, and I suspect we will see resolution when the current APCO trunking systems start being phased out for whatever comes up 'next.'
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WX4GPS
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Posts: 11




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« Reply #3 on: July 25, 2008, 08:57:19 AM »

I feel my immediate comment would be; you have D-Star in select area's and APRS is established in all states.  If I lived in a D-star area I think I would be more then happy to use or promote D-Star but once you get outside of that D-star location you will want to be on APRS to report a position or messaging via amateur radio so until D-Star is in more area's, I'd have to base it on where you will be using it.
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