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<DIV><FONT face="Comic Sans MS">So looking at that profile I see a small rise
close by that is probably less than my tower. But I have a lot of fir and ceder
all around me that are higher than the tower. How well will 5ghz pass through
the fir and cedar?</FONT></DIV>
<DIV><FONT face="Comic Sans MS"></FONT> </DIV>
<DIV><FONT face="Comic Sans MS">73,</FONT></DIV>
<DIV><FONT face="Comic Sans MS">Allen</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=apolloeme@gmail.com href="mailto:apolloeme@gmail.com">Patrick
Barthelow</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=psdr@hamwan.org
href="mailto:psdr@hamwan.org">Puget Sound Data Ring</A> ; <A
title=esarfl@gmail.com href="mailto:esarfl@gmail.com">esarfl@gmail.com</A> ;
<A title=apolloeme@gmail.com href="mailto:apolloeme@gmail.com">Patrick
Barthelow</A> ; <A title=jeff@gritch.org
href="mailto:jeff@gritch.org">jeff@gritch.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, October 05, 2013 10:38
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [HamWAN PSDR] HamWAN
portable</DIV>
<DIV><BR></DIV>
<DIV dir=ltr>Hello Guys,<BR><BR>I have been following the threads from the
eaves here, with interest, because I do/have done this intervisibility/path
loss kind of stuff a lot. I recently discovered a very powerful program
that can assist in this pursuit. Check out: <A
href="http://www.heywhatsthat.com">http://www.heywhatsthat.com</A> .
This program will construct, file and store a skyline horizon from any
location on the planet, looking in any direction. And it will identify
nearby intervening terrain peaks. It will answer questions such as
range, and elevations, intervisibility profile plots, bearings, distances,
fresnel zones, path loss, etc.. Make your viewshed maps, and file them,
in a library of such, on-line, or send them to your colleagues.<BR>. Try
it out. Enjoy..<BR><BR>Best, 73, Pat <BR><BR>
<DIV class=gmail_extra><BR><BR>
<DIV class=gmail_quote>On Sat, Oct 5, 2013 at 9:41 AM, Tom Hayward <SPAN
dir=ltr><<A href="mailto:esarfl@gmail.com"
target=_blank>esarfl@gmail.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>On Sat, Oct 5, 2013 at 9:26 AM, Jeff Francis™ <<A
href="mailto:jeff@gritch.org">jeff@gritch.org</A>> wrote:<BR>> <A
href="http://plane.gritch.org/plane/tn/2013-09-08%2014.18.42.jpg.html"
target=_blank>http://plane.gritch.org/plane/tn/2013-09-08%2014.18.42.jpg.html</A><BR>><BR>>
If you look in the back of the truck, you can see precisely the
same<BR>> antenna setup that Tom is using laying on top of the spare tire
(next to the<BR>> stool). From the park, I was close enough I just
propped the antenna up and<BR>> did it that way. No need for the
tripod (and the strange looks from other<BR>> park-goers).<BR><BR>From
that photo, I can tell you that it won't work. You're aimed at<BR>the sky.
The beamwidth of these dishes is very narrow and they must be<BR>aimed
precisely in both azimuth and elevation.<BR><BR>Here's my algorithm for
aiming:<BR>- First, I calculate the bearing from my current location to a
HamWAN<BR>site (your APRS client should be able to do this for you with
the<BR>HamWAN* objects).<BR>- Then I sight that bearing with my
compass.<BR>- With the Poynting on the tripod mast, I sight down the
feedhorn of<BR>the Poynting and line it up with the same landmark I spotted
with the<BR>compass, being sure to keep the feedhorn level in the elevation
axis.<BR>- At this point the signal LEDs on the modem have usually
registered<BR>something (I'm connected) and I can pan and tilt slightly in
each<BR>directly to maximize signal.<BR><BR>This works really well for me
because I have a sighting compass<BR>accurate to 1 degree and I know how to
use it. Another technique is to<BR>plot the path on Google Earth and look
for landmarks along the path.<BR>I've done this and sighted "between the two
water towers." This<BR>technique requires more patience and
panning.<BR><BR>This is microwave. It's a lot harder to get a signal than
VHF, but<BR>it's really satisfying when you do (and faster than 1200
baud!).<BR><BR>Tom
KD7LXL<BR><BR>_______________________________________________<BR>PSDR
mailing list<BR><A href="mailto:PSDR@hamwan.org">PSDR@hamwan.org</A><BR><A
href="http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org"
target=_blank>http://mail.hamwan.org/mailman/listinfo/psdr_hamwan.org</A><BR></BLOCKQUOTE></DIV><BR><BR
clear=all>
<DIV><BR></DIV>-- <BR>Best, Pat Barthelow <BR><A
href="mailto:apolloeme@gmail.com"
target=_blank>apolloeme@gmail.com</A><BR><BR>Google Lunar X prize Team,
SYNERGY MOON <BR><A href="http://wwww.synergymoon.com"
target=_blank>wwww.synergymoon.com</A> <BR><A
href="mailto:pat.barthelow@synergymoon.com"
target=_blank>pat.barthelow@synergymoon.com</A> </DIV></DIV>
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