6m MS network Performance Monitoring!
wb4jfi at knology.net
Thu Jan 3 09:43:39 CST 2008
If Propnet already uses that freq I suggest you use another. As you point,
out that they transmit only occassionally, mostly listening for other
propnet stations. You will transmit at a MUCH higher percentage of the
time, and block their chances to hear other propnet stations.
----- Original Message -----
From: "Robert Bruninga" <bruninga at usna.edu>
To: "'David Aitcheson - KB3EFS'" <kb3efs at yahoo.com>; "'tacos'"
<tacos at amrad.org>
Cc: <aprssig at lists.tapr.org>; <w2ev at yahoo.com>
Sent: Thursday, January 03, 2008 10:10 AM
Subject: RE: 6m MS network Performance Monitoring!
> > Subject: Re: 6m MS network Performance Monitoring!
> > look at http://www.propnet.org
> > it does exactly that.
> Yes, Propnet has lead the way. we hope to get some of the
> Propnet 6m folks on to this new application too. You are right
> that this is simillar to Propnet, but it is also quite different
> in several ways:
> * Propnet beacons infrequently, looking for band openings
> * MS requires continuous packet TX at a 25% duty cycle or so
> * Propnet is a system monitoring propogation for rare openings
> * APRS MS network will serve a specific communications mission
> The performance monitoring of the APRS 6m MS network is just an
> inherrent monitoring of communications throughput, since the MS
> path is statistically there all the time. (Meaning long term
> averages over hours)...
> Today I brought my radio in, and might find time this evening to
> hook it up.
> So it is 50.63, right? Hummh... If that is what is used by
> Propnet, then I hope they will not see this as interference?
> Maybe they will welcome it as additional sources?
> Or are these missions incompatible. Should the APRS MS channel
> be different. Is there a way to poll the Propnet folks for
> their opinions?
> Here is the APRS MS plan for 6m:
> Bob, Wb4APR
> > --- Robert Bruninga <bruninga at usna.edu> wrote:
> > > > I have revised my APRS MS web page to focus
> > > > on this exciting new capability.
> > >
> > > Wow, and I just added one more thought. And that is that
> > > Igate can also be probing the 6m sky with its own periodic
> > > packets.
> > > Then, if any one of the other dozens of 6m Igates hears it,
> > > it is visibile back to the originating Igate in real time as
> > > feedback. The Igates themselves then can easily build their
> > > statistics on their own real-time success rate.
> > >
> > > They can use this to fine-tune the optimum statistical
> > > rate to obntain the performance we desire! (97%) probablitiy
> > > delivery... PLUS real time performance data on the whole 6m
> > > network!
> > > http://www.ew.usna.edu/~bruninga/meteors.html
> > >
> > > Bob, WB4APR
> > >
> > >
> > >
> > > One thing down the road we might need is for
> > > > ALOGGER to also TX messages back into the disaster area.
> > > > Something like this:
> > > >
> > > > Someone send an EMAIL to the disaster area. All 6m Igates
> > > > the message and schedule it for transmitting. Each Igate
> > > > transmits according to the normal 15 second TX windows for
> > > > each quadrant of the country. They do this for say one
> > > > (TBD).
> > > >
> > > > All we have to do is figure out the probability
> > > > and set the TX time for that amount of time that will give
> a 3
> > > > sigma chance of delivery (97%)... And the MS Igates can
> share the
> > > > schedule if more than one is in any given area.
> > > >
> > > > There is a pallet full of 6m radios available. Mike in
> > > > AMRAD group is looking into a buil purchase. And with the
> > > > foot long wire giving great gain (12 dBi), the antenna
> > > > be trivial.
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