DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
| reply to superdog
Re: SuperDog's PoP Plots
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-
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| 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!
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DaDogs
Semper Vigilantis
Premium
join:2004-02-28
Deltaville, VA
1 edit | 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.
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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
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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!!!!
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