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<div class="moz-cite-prefix">Plenty of very cheap buck converters to
get 5V from higher voltage DC sources. I don't think power is a
problem.<br>
<br>
What is this composed of? Does RTKLib allow you to output data as
an NTRIP caster? <br>
<br>
Is there any kind of database your GPS could look up against its
location and select it? Or would you just need to know the IP# as
an ad-hoc lookup?<br>
<br>
Danny<br>
<br>
On 5/12/2014 5:22 PM, John Morris wrote:<br>
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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>
</div>
<div><br>
</div>
<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>
</div>
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<div>
<div>John Morris<br>
Menlo Park, CA<br>
<br>
________________________________________<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:foss-gps-bounces@lists.osgeo.org">foss-gps-bounces@lists.osgeo.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:foss-gps-bounces@lists.osgeo.org"><foss-gps-bounces@lists.osgeo.org></a> on behalf of
John Morris <a class="moz-txt-link-rfc2396E" href="mailto:john@coyotebush.net"><john@coyotebush.net></a><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: <a class="moz-txt-link-abbreviated" href="mailto:foss-gps-bounces@lists.osgeo.org">foss-gps-bounces@lists.osgeo.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:foss-gps-bounces@lists.osgeo.org"><foss-gps-bounces@lists.osgeo.org></a> on behalf of
Danny Miller <a class="moz-txt-link-rfc2396E" href="mailto:dannym@austin.rr.com"><dannym@austin.rr.com></a><br>
Sent: Thursday, May 08, 2014 1:25 PM<br>
To: <a class="moz-txt-link-abbreviated" href="mailto:foss-gps@lists.osgeo.org">foss-gps@lists.osgeo.org</a><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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