I'll take a copy of your excel file Charles. ;-) ----- Original Message ----- From: "Charles Wu" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Wednesday, August 06, 2008 9:24 AM Subject: Re: [WISPA] Pathloss 4
Hi Michael, All Pathloss basically does is calculate Vigants-Barnett and/or ITU 530-9 on top of a topo-USA It also doesn't do a good job of taking into account for near/far field interference and all those other "black magic" Rf affects that occur All-in-all, I don't see much difference between that and the Motorola / Orthogon link calc (which, initially, was just a bunch of ITU models coded into an excel spreadsheet) That said, although one could argue that Pathloss is a good tool for someone who doesn't have an engineering background to quickly design paths, I would counter saying that if you don't actually understand the underlying models behind Pathloss, then you shouldn't be billing yourself as a Microwave engineer =) That said, if one truly understands the background theory behind the availability models, you're probably bright enough to spend the 1-2 hours coding some VB macros into an excel spreadsheet to get the exact same result and you'll have saved yourself $4k -Charles P.S. I've attached a copy of ITU Recommendation P-530-9: Propagation Data and Prediction Methods required for the design of terrestrial line-of-sight systems if anyone is truly interested and wants to learn how stuff actually works -- personally, I think understanding this and Vigants-Barnett should be a pre-requisite for anyone who truly wants to call themselves an Microwave Rf Engineer ------------------------------------------- WiNOG Wireless Roadshows Coming to a City Near You http://www.winog.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of MichaelDavidLake Sent: Wednesday, August 06, 2008 9:11 AM To: WISPA General List Subject: Re: [WISPA] Pathloss 4 Daniel, Most professionals use Pathloss..... Most if not all commercial carriers use Pathloss.... I've been engineering Paths for 8 years and swear by it. Its worth it.... Knowing how to use it properly is priceless. I'm not in here much any more because some of the members like to go against the grain and try to re-invent the wheel with their "profound knowledge" and lack of experience. Pathloss is a winner. I've used it over the yrs to design networks in over 10 major US markets. 100-400 paths per market. Its a great product. You will need to know how to use a GPS. The software ( Pathlosss ) is a great tool but it should be used in coordination with a process of " eyes on/ hands on ". Nothing is more valuable than Driving the path and terrain to see what the software is showing you on paper. The software isn't going to show things like new construction. It isn't going to show you that 80' tree sitting on the highest terrain feature blocking your path with gear at 60' on the tower/rooftop. Mikey In a message dated 08/05/08 14:35:25 Eastern Daylight Time, [EMAIL PROTECTED] writes: Anyone on the list using Pathloss 4? Just trying to figure out if the money is really worth it. Thanks! Daniel White 3-dB Networks -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
