[aprssig] Iridium humbles APRS
russ at wxqa.com
Sun Apr 8 08:45:31 CDT 2012
One aspect of sending packets through Iridium is that there is much less
chance of large delays sometimes caused by I-gates when using APRS-IS.
This PowerPoint has results of a study done last year comparing Iridium
and APRS-IS for carrying APRS packets from balloons.
The balloon flights labeled with callsigns used APRS-IS and the flights
labeled with AIRCOR used Iridium. The large delays sometimes seen
significantly degrade the usefulness for reporting balloon positions to
the FAA ATC.
On 4/7/2012 6:34 PM, Brian Moore wrote:
> Bob, I can't thank you enough for your APRS system, I am a new ham and
> still a technician class one at that. I am a huge proponent of APRS
> and see its benefits for every ham. I hear your frustration when
> someone shows you up with a multi-billion dollar satellite system like
> Iridium, and discards APRS as a toy. Although a few weeks ago I read
> an email from you talking about a satellite constellation for APRS on
> 145.825, and that could rival Iridium's usefulness. It would not have
> the bandwidth, nor the operational costs. Something like that would
> enhance the current terrestrial based APRS network on 144.390, making
> truly global tracking, messaging, and situational awareness possible
> without a need for new gear on the user end. People use simple HT's to
> make contact through satellites every day.
> I won't carry on much more, I just wanted to state that at least some
> of us out here are aware of the boon to overall capabilities APRS adds
> as a whole, your ideas are not falling on deaf ears. I don't go a day
> without telling someone about APRS.
> Thank you, Brian KD0QCT
> On Sat, Apr 7, 2012 at 7:13 AM, Jason KG4WSV <kg4wsv at gmail.com
> <mailto:kg4wsv at gmail.com>> wrote:
> On Fri, Apr 6, 2012 at 4:06 PM, Bob Bruninga <bruninga at usna.edu
> <mailto:bruninga at usna.edu>> wrote:
> > $950 unit cost...
> > leverage off the DOD Gateway... $250/mo... all the bandwidth you
> > NSF paying $1.2M per year for irridium.. "paying for SIM cards"...
> > THey just got $2.3B to build the next
> > network..
> That sounds cool if you've got the application and the budget, but
> looking at it another way: for the price of an expensive unit, plus
> monthly service fee, using only a few billion $$ in infrastructure,
> you can be connected. Sounds like cell phones.
> I don't see how this can "humble" or even compare to APRS; they are
> very different communications systems. As I tell my students, if I
> have two D7s I have a complete digital and voice communications
> network. Doesn't matter if natural disaster takes down the cell phone
> towers, or if i'm on the dark side of the moon or mars.
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