* Bill Powell <[EMAIL PROTECTED]> [2007 Jul 30 20:34 -0500]: > Looking for experience and advice in using SPLAT or RM to "reverse > plot" a repeater. > > What I'd like to do is identify holes in the current coverage and run > a plot with SPLAT or RM with the holes as the center point to identify > potential repeater sites. > Do I use mobile parameters (antenna height) at the hole or do I use an > estimated height of 100' assuming that I'll have a 100' tower at the > new site?
I would start with mobile parameters and the hole as the center point and do a coverage plat to an antenna at 100' AGL. With most versions of SPLAT! this will show theoretical line of sight. You should clearly see the results of earth elevation changes. You can also tell later versions of SPLAT! to use a Longley-Rice model that more approximates an RF path than line of sight. > Restated - how do I insure that reciprocal results are reliable? That is tough to do as the computer programs can't account for foliage and man made structures that will cause further path loss. Up until the last release or so SPLAT! only calculated line of sight. Now it includes a longley-Rice model option I think John is working on other algorithms for the current version. Have you sent John an email about this? He is quite responsive and would know as well as any one how you might approach your problem with SPLAT!. - Nate >> -- Wireless | Amateur Radio Station N0NB | Successfully Microsoft Amateur radio exams; ham radio; Linux info @ | free since January 1998. http://www.qsl.net/n0nb/ | "Debian, the choice of My Kawasaki KZ-650 SR @ | a GNU generation!" http://www.networksplus.net/n0nb/ | http://www.debian.org