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Nah, we'd need some beefy self-supporting thing that can withstand
ice loading. It's a serious mountain in the winter.<br>
<br>
--Bart<br>
<br>
<br>
<div class="moz-cite-prefix">On 6/22/2015 1:06 PM, Rob Salsgiver
wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Do
you have any use for Rohn 25 sections, or is that too small?<o:p></o:p></span></p>
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style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<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>Bart
Kus<br>
<b>Sent:</b> Monday, June 22, 2015 12:49 PM<br>
<b>To:</b> Puget Sound Data Ring<br>
<b>Subject:</b> Re: [HamWAN PSDR] East Tiger Mountain
cell site on the air<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Dean,<br>
<br>
I think it would help in discussing these comparisons if you
were to express the RF power not in terms of absolute power,
but in terms of power spectral density (W/Hz). The 1W modem
is set for 5MHz bandwidth when communicating, so its PSD is
0.2uW/Hz. Your 0.1W handheld is set for 25kHz bandwidth, so
its PSD is 4uW/Hz. That's 20x higher power density. If the
noise floors of both spectrums were equal (which they aren't)
that would mean a 13dB increase in the ability of the FM radio
to discern a signal, compared to the modem.<br>
<br>
So 70cm FM has a lot going for it here. It has better NLoS
propagation combined with a theoretical 13dB PSD boost. On
the flip side, you have the 30dBi gain of the modem dish
helping you to compensate for those losses.<br>
<br>
This weekend I'll be running our first tests of the 900MHz
gear in NLoS conditions. I did some lab tests on it over the
weekend, and it looks like @ 5MHz bandwidth it transmits just
about 1W. The signal, being OFDM, isn't very tight, so we'll
have to be very careful with 900MHz repeater co-location.
We'll also have to watch out for colocated 800MHz users.<br>
<br>
Regarding you linking to ETiger, there's a bunch of trees in
the way, but give it a try! The mountain tower unfortunately
does not clear the surrounding tree line. If someone feels
like donating a 60ft tower for up there, I'm sure that'd
help. :) Also, keep in mind that due to the tree issue,
ETiger was only installed as a single sector site. Sector 3,
aimed at 240 deg. Have you tried aiming @ Haystack yet?
Nigel just moved and is linked up to it now from Everett. We
need to do some tree pruning @ that site to raise its signal
levels.<br>
<br>
--Bart<br>
<br>
<o:p></o:p></p>
<div>
<p class="MsoNormal">On 6/22/2015 11:04 AM, Dean Gibson AE7Q
wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Recently I
noticed that I can access the WA7HJR (444.65MHz) repeater on
East Tiger, from my home in Mill Creek, with the Icom and
Yaesu handhelds at <b>0.1W</b>. Reports are that it is a
bit scratchy, but pumping the power all the way up to <b>0.5W</b>
gives a reported clean signal.<br>
<br>
OK, that's 70cm, not 5cm. However, I've long been able to
access KB7CNN (1292.2MHz) at the same site with <b>1W</b>.<br>
<br>
All antennae above are omni.<br>
<br>
Meanwhile, my connection to the Paine site has dropped in
the last month from -77dBm to -84dBm. If last year is any
indication, I have about 30 days until I lose the connection
to Paine for another six months. Originally I thought this
was due to seasonal foliage growth, but since reception
didn't come back until late February, I think it's something
else. Just to one side (a couple hundred feet) of my direct
path to Paine, is a <b>huge</b> water tower just south of
132nd Street, and I'm wondering if that was serving as a
reflector when it was full, and not so much as it emptied
during the summer (or maybe partially resonant or energy
absorbing?), and not refilled until the winter. That
hypothesis fits the timeline better than foliage ...<br>
<br>
Anyway, when I get the time this summer, I will try moving
the 5shpn & antenna to the south side of my house and
try to connect to the HamWAN site at East Tiger. Using
Google Earth, I see that the bearing from my house to East
Tiger is 156 degrees. I also see that the bearing to the
Baldi site is 160 degrees, a <b>four degree</b>
difference. Google Earth's elevation plot shows a clear
path to both East TIger and Baldi, the latter path <b>barely</b>
clearing the terrain just west of East Tiger. VE2DBE's
Radio Mobile Online ( <a moz-do-not-send="true"
href="http://www.ve2dbe.com/rmonline.html">http://www.ve2dbe.com/rmonline.html</a>
) plot agrees.<br>
<br>
This brings up the subject of common sector frequencies.
Theoretically, the narrow beam of my antenna dish (isn't it
about 3 degrees?), coupled with East Tiger being only 28.3
miles away compared to Baldi at 47.8 miles, I would think
would resolve any interference.<br>
<br>
Thoughts?<o:p></o:p></p>
<div>
<p class="MsoNormal">On 2015-05-31 19:50, Bart Kus wrote:<o:p></o:p></p>
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<p class="MsoNormal">We put a new cell site on the air this
weekend. It's @ East Tiger Mountain, and radiating @ 240
degrees (Sector 3) only. It's linked directly to the
Tukwila datacenter, and has a second link to Snohomish DEM
("Paine"), but that's not yet configured for routing. This
site is 1500ft higher than our existing Mirrormont site,
and will serve to replace it. It's superior location and
superior connectivity are a double-win. Mirrormont has
been re-configured to be on the Sector 2 frequency
temporarily so as not to conflict, but will go off the air
at some point in the near future. If you're in the
coverage area try to give it a go and report back! <br>
<br>
--Bart <o:p></o:p></p>
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<br>
<br>
<br>
<o:p></o:p></p>
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