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Ah, OK the 240 degree (+-60) sector probably isn't going to work (I
need something that covers 340 degrees). Darn. I may try the
Haystack site, but that has some antenna siting difficulties.<br>
<br>
<div class="moz-cite-prefix">On 2015-06-22 12:48, Bart Kus wrote:<br>
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<blockquote cite="mid:5588669A.9020506@bartk.us" type="cite">
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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>
<br>
<div class="moz-cite-prefix">On 6/22/2015 11:04 AM, Dean Gibson
AE7Q wrote:<br>
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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" class="moz-txt-link-freetext"
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?<br>
<br>
<div class="moz-cite-prefix">On 2015-05-31 19:50, Bart Kus
wrote:<br>
</div>
<blockquote cite="mid:556BC881.8070409@bartk.us" type="cite">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 <br>
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