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When you attempt to ping using the K7LWH/DD module, what IP address
do you specify?<br>
<br>
<div class="moz-cite-prefix">On 2014-05-24 14:36, Bob wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal">Dean,<o:p></o:p></p>
<p class="MsoNormal">Here are some observations and conclusion
that I have come up with in adding the ID-1 to the Kirkland
Emergency Communications Team’s tool box. I have done a
number of tests of the ID-1 from various locations in Kirkland
in both the Digital Data (DD) mode and the Digital Voice (DV)
mode. I tested simplex paths (ID-1 to ID-1) and paths to the
Lake Washington Ham Club (LWHC) DSTAR DV repeater and DD
gateway nodes in Bellevue.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraphCxSpFirst"
style="text-indent:-.25in;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]-->There
are a few locations in Kirkland that have direct visual line
of site to LWHC Gateway in Belleview. From those locations,
pings are consistently returned in 100 to 200ms with an
occasional loss.<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]-->We
have two location (Stations 22 and 25) are not visual but
according to Radio Mobile modeling skim the terrain. At these
sights no ping are returned.<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span
style="mso-list:Ignore">3.<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]-->At
my home QTH (Lat: 47.694 Lon: -122.2161) I do not have a
visual of the LWHC Gateway, but I get occasional pings
returned.<o:p></o:p></p>
<p class="MsoListParagraphCxSpMiddle"
style="text-indent:-.25in;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span
style="mso-list:Ignore">4.<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]-->John
Hays loan me a 1.23 GHz directional antenna. With the
directional antenna I detected two paths to the gateway. One
was off a condo about 180 degrees from the gateway about a
mile away; the other was off the NOAA building four miles awat
at Sand Point about 15 degrees clockwise from the gateway.
This indicates the presents of multi-paths that could be
interfering with the data even with good signal strength.<o:p></o:p></p>
<p class="MsoListParagraphCxSpLast"
style="text-indent:-.25in;mso-list:l1 level1 lfo3"><!--[if !supportLists]--><span
style="mso-list:Ignore">5.<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]-->I
will also confirm the DV mode is more robust than the DD mode,
but it too is affect by multi-path.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">About 2 weeks ago I brought the ID-1 on
line to serve as an alternate path to the Winlink CMS.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Bob – KE7JL<o:p></o:p></p>
<p class="MsoNormal"><o:p><br>
</o:p></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
PSDR [<a class="moz-txt-link-freetext" href="mailto:psdr-bounces@hamwan.org">mailto:psdr-bounces@hamwan.org</a>] <b>On Behalf Of </b>Dean
Gibson AE7Q<br>
<b>Sent:</b> Saturday, May 24, 2014 10:20 AM<br>
<b>To:</b> Puget Sound Data Ring<br>
<b>Subject:</b> [HamWAN PSDR] 1.2GHz to Paine [was:
44.x.x.x HamWAN network at Paine]<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Scott Honaker and I have moved forward on
this project:<o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">We have installed a gateway (Linksys BEFSR41)
between the ID-1 and the internal ARES/RACES subnet (not
44.x.x.x) of the DEM.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2
level1 lfo1">We have installed a Digi "AnywhereUSB" box to
give us remote access to the ID-1's USB port, and thus
remote control of the ID-1 radio. This not only allows
multiple use of the ID-1 (which has useful 1.2GHz FM and
digital voice modes as well as Ethernet data), but provides
for remote frequency agility and a diagnostic capability.
This works beautifully (eg, to search for and use a
low-noise frequency)!<o:p></o:p></li>
</ol>
<p>Unfortunately, what does not work very well, is the RF
portion of the connection. PINGs failed at a rate of over 99%
when using the 1.2GHz antenna at the 70 ft level on the tower,
so we swapped the antenna with the one used for the Icom
1.2GHz repeater (which wasn't seeing any action anyway) at 100
ft. That made a "dramatic" improvement, as PINGs now only
fail at a 98% rate (depends upon the time of day, etc)!<o:p></o:p></p>
<p>Antenna comparison between 1.2GHz and 5.9 GHz for the two
sites:<o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0
level1 lfo2">On 1.2GHz, both antennas are omni-directional.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0
level1 lfo2">At the DEM, the 1.2GHz antenna is now at the
100' level, whereas the 5.9GHz antenna is at 150'.<o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0
level1 lfo2">At my home, the 1.2GHz antenna is about 10'
above the 5.9GHz antenna, and it's on the same line-of-sight
path.<o:p></o:p></li>
</ol>
<p>Note that voice communication between the two sites using the
two ID-1 radios, is fine (there is a slight bit of noise on
FM).<o:p></o:p></p>
<p>The big difference, in my opinion? I'll bet that the
wireless protocol used by the MikroTik radios includes an
aggressive error correction and retry protocol, whereas the
ID-1 is like a piece of Ethernet cable, and thus relies on the
standard TCP/IP retry mechanism. The TCP/IP protocols, while
"unreliable" in the technical sense of the term, require a
higher overall reliability than a typical raw wireless
connection.<o:p></o:p></p>
<p>What this says (and I'm a bit surprised to note this), is
that sites considering using ID-1 radios for data
communications, may find that even with the tighter siting
requirements of 5.9GHz, that the latter may be more successful
(whether or not part of HamWAN). In addition to being a
lower-cost radio with a much higher data rate, the MikroTik
radios offer a built-in router, which can obviate the need for
a separate router.<o:p></o:p></p>
<p>-- Dean<o:p></o:p></p>
<p style="margin-bottom:12.0pt">ps: The callsign and digital
code filtering features of D-Star that we previously
discussed, are not available (greyed out in the software) for
digital <b>data</b> mode. Huh? Another fine example of
software of the "seven last words" of poor program design: <b>"Why
would you want to do that?"</b><o:p></o:p></p>
</div>
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