Hmmmmmm,
Nothing wrong with added features one can use or ignore as desired for their
local pleasure.Only thing is to make sure one doesn't start dumping the feed
into the national -IS stream as somemight take offense. Also Xastir can take a
second NMEA stream and plot it on the map with Jason's kg4wsv perl script:
http://www.ece.uah.edu/~jdw/rockets/gps2aprs.txtJust allow networking with
xastir and modify the script with the port that the incoming NMEA data iscoming
in on and one is good to go. Technique is modify the script, make it
executable, have Xastir running, pull up a console window, run the script and
the data will be seen streamingin on the window. Minimize the console/window
and the data/icon is on the mapThis is the no-license-required ISM, NMEA GPS
amateur rocket tracker that works with this script:Eggtimer Rocketry -
EggfinderOnce per second updates as long as valid packets are received.
Jason's script essentially turns theNMEA data into what I call a "pseudo" APRS
packet 1/sec and the computing power makes this possible.Xastir doesn't have a
problem plotting this once per second.Since I have digipeating turned off, no
possibility of it being injected into the -IS stream.When out in the field, the
laptop doesn't have access to the internet anyways so absolutely no way it
clogs the -IS stream even if I were to have digipeating turned on.
The thing on my wish list is a map database that is "download and dump" and one
is ready to go withoff line use on Xastir. Personally, I have some of the old
Tiger and Cloudmade maps but a simplemap database that new, inexperienced users
could figure out and just "load and go" would have thepotential to add to the
program popularity.
As an aside, two instances of APRSISCE/32 can track an NMEA tracker like the
EggFinder. One instance monitors the NMEA EggFinder tracker in realtime and a
minimized instance that is monitoring the local position from its GPS
stream.The second instance then "beacons" over a local -IS server link to the
1st instance and both positions are plotted on the map.Advantage here is the
program can cache mapsets for off line use. Again, since this is used in the
field for off internet use, no chance of clogging the -IS feed. In fact if one
just sets up the programs for the NMEA tracker, there really isn't any fearof
clogging up the -IS servers.
Another aside is I once experimented with Xastir by seeing how fast an APRS
packet could be beaconed. Relax, as I experimented off of144.390 by having the
incoming Eggfinder stream being digipeated out through Xastir on another 2
meter frequency. I found that a packet could be reliably sent at once every 3
seconds. You say you can't do that? Well.........One can manually go into and
edit the configuration file and decrease the rate from the lowest once every 5
seconds to even lower frequency. As long as one doesn't go back to the config
pull down it will stay at whatever one sets. The Eggfinder came in at 1/sec
and the fastestXastir could reliably digipeat was once every three seconds.
Any lower and their were too many collisions between incoming and outgoing
data. Any use for this with APRS?Nahhhhh, but was fun playing with it. The
high frequency position monitoring is of only interest to a person like myself
to monitor a local situation like an amateur rocket flight.It would be
discourteous to stream this over the -IS network or Rf at such a high
frequency.
Kurt KC9LDH
From: Dexter N Muir <[email protected]>
To: [email protected]
Sent: Friday, March 11, 2016 4:41 PM
Subject: Re: [Xastir] ADS-B (planes)
Y'know I'm left wondering: Why 'planes? I mean, xastir - and APRS - is
great for activity reporting and hazard alerts - fire, flood, quake etc
- even its under-utilised messaging, particularly in SAR activity - but
why aircraft? I'd think anyone wanting to watch them would have hardware
to get info off-air or know of specific ADS-B feeds, and have software
already available to display same. Anything capable of running xastir
should be able to do ADS-B stuff alongside or instead at need - why
clutter or feature-creep Amateur/SAR with that? Just because you can?
73
Dex, ZL2DEX
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