DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
edit:
May 7th, @12:09AM
| SuperDog's PoP Plots
Visual Line of Sight | 
2.4 Ghz, no clutter, no vegetation | 
2.4 GHz ISM with clutter | 
2.4 GHz ISM with vegetation. |
The Visual Line of Sight plot shows VLOS from the pop to points 20' above the ground. Most roof installs are at about 20'.
Second Plot
The no clutter plot shows coverage for a 2.4 GHz system operating with 17 dBm transmit power into an 8 dBi omni antenna. Feed line losses were modeled at only 1 dB. The receive sensitivity for the system was modeled at -86 dBm. This is a fairly close model of the Alvarion FHSS system when operating at 1 MBit. I am not modeling high gain antennas at either end of the link. The CPE is also modeled with an 8 dBi gain antenna.
Third Plot
The same system is modeled with losses for 33 percent urbanization. The plot presumes the presence of buildings across 33% of the terrain.
Fourth Plot
The same system is modeled with losses for 33 percent forestation. The plot presumes the presence of forest across 33% of the terrain.
Couple of points should be made here. First the 2.4 GHz system that was modeled presumed all units in the system were equipped with 8 dBi omni antennas, normally we would not do that with CPE at 2.4. This means that the 2.4 GHz systems were modeled with an EIRP of only 17dBm + 8 dBi -1 dB = 24 dB EIRP (250 mw). This would be a VERY low powered system.
The map is 12.4 miles wide by 12.4 miles tall. Your tower is modeled at 24' on top of an 83' building which sits on real terrain at 157 meters. That is what the SRTM data said the elevation was at your coordinates. That puts the base of your antenna 622 feet above sea level.
Superdawg, PM me with your E-Mail and I will send you the high res images and the pdf. I'd be interested in seeing you plot your actuals against the predicted so that we can get information regarding the accuracy of these plots.
-m-
--
»www.freeantennas.com |
|
John Galt
Premium
join:2004-09-30
Oceanside, OR | A very substantial change...going to 900 MHz.
Are these for the new PoP?
--
A is A |
|
DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
| said by John Galt  :A very substantial change...going to 900 MHz. Are these for the new PoP? Yes they are for his new pop. There are some caveats I am adding. The 2.4 GHz stuff was modeled with an EIRP of only 250 mw, whereas the Canopy model was a high fidelity model and therefore modeled at 36 dB EIRP.
I have removed the 900 MHz plot for the time being. Probably not necessary in this context.
-m-
--
»www.freeantennas.com |
|
John Galt
Premium
join:2004-09-30
Oceanside, OR
| reply to DaDogs
I was trying to figure out why the signal to the north was so diminished. Now I see why...
Those hills sure put the "kibosh" on the signal.
Oh well!
--
A is A |
|
DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
edit:
May 7th, @12:18AM
| 
Here is the actuall size of the plots |
|
|
VariableARK
join:2003-03-17
USA | reply to DaDogs
whatd u use to plot that? |
|
DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA | Radio Mobile Deluxe, shuttle radar topography mission data, and topo maps from terraserver-usa.com.
-m-
--
»www.freeantennas.com |
|
Denver Max
join:2005-03-31
Scotland | Man i wish i could even get a map of the areas i want ot cover... the latest one ive seen is 10 years old and has nothing usefull on it..... its all shoot and hope for me.. 180f tower it is then
:0S |
|
superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
 ·WaveCrazy.Net
| I just want to thank Michael for taking the time to do this!. I think radio mobile is the best, I just don't have the patience for it.:D. I hope that we all can learn from this one?.:)
--
»www.wavecrazy.net Join WISPA today! »www.wispa.org/ |
|
DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
| 
Best Predictor |
This one is going to be your best predictor. I tweaked it a bit to more accurately model the system parameters you gave me and color coded the predicted RSSI.
Yellow = -90 to -87 dBm
Green = -87 to -83 dBm
Orange = -83 to -80 dBm
Red = -80 to -76 dBm
I've left it actual size. I'll be emailing a PDF with all this infor in it.
-m-
--
»www.freeantennas.com |
|
superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
·WaveCrazy.Net
| said by DaDogs :I've left it actual size. I'll be emailing a PDF with all this infor in it. -m- Michael, once again, Thank You very much, I have always been Your #1 fan. You are Da'Man!
--
»www.wavecrazy.net Join WISPA today! »www.wispa.org/ |
|
DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
edit:
May 7th, @04:13PM
| Naw Dawg, you are Da'Man. I have an ulterior motive anyway. I'd really like to see what this last image looks like in a few months if you print it and stick a white pin in it every where the prediction looks correct, and a black pin in it every where that it looks wrong.
For example, suppose you stick a client radio with a receive sensitivity of -86 dBm at a location in the -90 to -86 dBm RSSI band (yellow area). If you install that customer with a 16 dBi panel on a coax which has ~3 dB loss, you get this:
The client radio has receive sens of -86 that is at most 4 dB less receive sensivity than the predicted signal. That subtracts from the antenna you use. If you use a 16 dBi antenna and you subtract that 4 dB deficit in receive sens it is like using a 12 dBi antenna. Now subtract out the 3 dB for feed line losses and you are down to 9 dB fade margin. If you add the fade margin back into the RSSI for the CPE you get -77 dBm (-86+9). This tells us the prediction is good if the *measured* RSSI is between -77 dBm and -73 dBm and the client is in a YELLOW area. If the prediction is bad the measured RSSI would be above -73 or below -77 for that client system.
Such a chart *might* be useful for determining which antenna type you are going to install in each band.
It would be a good way of marking all your customers locations as well.
--
»www.freeantennas.com |
|
korym
Go Wisp's
ExMod 1999-03
join:1999-12-23
Richmond, VA
clubs:
| Good point, Michael.  I'm truly inspired by all your efforts with Tim's new PoP. Very, very impressive.
I was working on a commercial-based application with someone that would allow for pre-subscription and eliminating about 80-90% of pre-qual truckrolls via a simple web-based search interface using street addresses with semi-realtime GPS and demographic data. Unfortunately, I haven't talked with the guy in a couple of months and am not sure where the project stands.
Either way, here's a link that also might prove helpful for something like this:
»www.wirelessmapping.com/
Granted, Radio Mobile may offer an interface like this. Michael would probably know best of course.
HtH!
Thx again!
Regards,
Kory
--
WISP Directory : WISP News : Start a WISP : WISP Classifieds |
|
jdmarti1
Jack
join:2004-06-15
Oilton, OK
| I love Radio Mobile. I have used it for all of our predictions so far. I just hope that it works out close to the predicted model. The program is very intuitive, at least I thought. There is also a very basic demo site that will get you started with it. The best thing is the price!!!!
--
»magicwisp.com |
|
