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<div><span style="font-size:12pt">The basic requirements for a base station</span><span style="font-size:12pt"> are 1) a good location, 2) </span><span style="font-size:12pt">reliable power and</span><span style="font-size:12pt"> 3</span><span style="font-size:12pt">)
reliable networking</span><span style="font-size:12pt">. I suspect ham relay towers are in excellent locations and they have</span><span style="font-size:12pt"> solved the power issues. They probably don't have great networking bandwidth</span><span style="font-size:12pt">.
You could handle a limited number of connections on a local caster, but the main "hub" caster should have a high bandwidth connection and probably reside somewhere back in town.</span><br>
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<div>My rPI fits into a weatherproof box and is powered over the ethernet cable (POE). I'm using a Trmble compact dome antenna mounted on a 3/4" pipe. Rather than placing the antenna on a tall, wiggling tower, I'm hammering the pipe deep into the ground. The
earth is a much more stable platform for precise positioning.<br>
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<div>I'm not sure what voltages are available in the ham towers. The rPi needs a clean 5V. I'm using a remote POE adapter over a 100m ethernet cable. If you have 110Vac or 12V nearby, you could use a simple USB charger instead.<br>
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<div>John Morris<br>
Menlo Park, CA<br>
<br>
________________________________________<br>
From: foss-gps-bounces@lists.osgeo.org <foss-gps-bounces@lists.osgeo.org> on behalf of John Morris <john@coyotebush.net><br>
Sent: Monday, May 12, 2014 11:17 AM<br>
To: Open Source GPS-related discussion and support<br>
Subject: Re: [FOSS-GPS] Amateur NTRIP casters<br>
<br>
I'm setting up a small ntrip caster which runs on a RaspberryPi. It takes data from an Lea-Xt and can broadcast both raw and RTCM 3.1 messages. It doesn't support all the variations of Ntrip - just Ntrip 2 over tcp with simple password protection - but that
is all I need for my purposes.<br>
<br>
Over all, I'd like to set up a series of local, community base stations, and then do a mobile app for short static positions. I haven't started the mobile app yet, but the base station software is close to being usable.<br>
<br>
I'd be interested in collaborating.<br>
<br>
John Morris<br>
<br>
Menlo Park, CA<br>
<br>
________________________________________<br>
From: foss-gps-bounces@lists.osgeo.org <foss-gps-bounces@lists.osgeo.org> on behalf of Danny Miller <dannym@austin.rr.com><br>
Sent: Thursday, May 08, 2014 1:25 PM<br>
To: foss-gps@lists.osgeo.org<br>
Subject: [FOSS-GPS] Amateur NTRIP casters<br>
<br>
I have seen some things about NTRIP casters as references. They're<br>
supposed to be useful, but few and far between. Long-distance baselines<br>
are likely.<br>
<br>
I was talking to a local ham radio group the other day, which was into<br>
setting up stations... repeaters I think, as a grassroots public<br>
service. I think there was some sort of internet connection involved there.<br>
<br>
Would it be useful to use something like LEA-6T or NV08-C L1 stuff as an<br>
amateur, but more likely to be local (low baseline), NTRIP caster?<br>
<br>
It really doesn't seem difficult to add this functionality to the sort<br>
of physical stations they do. Is it useful for accuracy? Is there an<br>
existing framework by which amateur, local NTRIP data could be located<br>
and accessed?<br>
<br>
Danny<br>
<br>
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