dear friends if anybody is interrested in figure out a radio location then try out the program "radio mobile" ....
http://www.cplus.org/rmw/english1.html you can build networks ... repeatersites ... etc. there are heights data from a space mission where the heights of the whole worlds were measured by radar .... put your repeater on its location, fill in the data for pwr, antenna gain etc. and see what happens .... best 73´s de dg9bfc -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[EMAIL PROTECTED] Auftrag von Gary Schafer Gesendet: Dienstag, 12. August 2008 02:40 An: [email protected] Betreff: RE: [Repeater-Builder] Height Gain figure > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Dave Gomberg > Sent: Monday, August 11, 2008 8:37 AM > To: [email protected] > Subject: Re: [Repeater-Builder] Height Gain figure > > At 16:42 8/10/2008, Dick wrote: > >An antenna's gain is what it is and it doesn't change with elevation. > > I am assuming you mean elevation over the surrounding terrain?? > > This is not true. For example, a dipole has an energy distribution > pattern that changes markedly with height above ground. Just try > using a NVIS for DX! And verticals become ineffective at very high > installation points unless special steps are taken to compensate (by > improving the counterpoise). Anyway, that's my opinion and I'm stickin' > to it. Once the antenna is several wavelengths above ground (as it will be with any reasonable height at VHF and above) the pattern is going to be the same no matter how much higher it is raised. The ground will have insignificant effects on the radiation pattern. 73 Gary K4FMX
