what are all ral parameter to consider in a radio link path loss
what are all ral parameter to consider in a radio link path loss
(OP)
Hi
Can someone let me now where to get not just isotropic anntena parameter to consider in path loss, I am looking for all parameter involved to get a real attenuation between two points.
Also if there is a software to do it and where I can get it
Thank you in advance for it
Luis
Can someone let me now where to get not just isotropic anntena parameter to consider in path loss, I am looking for all parameter involved to get a real attenuation between two points.
Also if there is a software to do it and where I can get it
Thank you in advance for it
Luis
RE: what are all ral parameter to consider in a radio link path loss
The two simple parts are just;
1) Antenna Gain at each end
2) Simple formula "spaceloss" between the antennas
Then you add some extra factors for "longer paths"
3)Atmospheric Attenuation (higher frequency problem usually), and rain can really change the results alot.
4)Blockage by buildings and mountains etc.(calculable, but not too accurately)
5)Multi-path
6)Atmospheric fading for long paths(below 75 mhz typically), varies with location, time of day, etc.
Note on Multi-path: This is one of the trickiest and most difficult to estimate.
One example; transmission between sona buoys over water - using 802.11b. The communication length was measured (about 4 years ago by a friend of mine in California) at 25% of the expected calculated length due to multipath bounce off the waves, 25% is equivalent to 24 dB more loss in the original pathloss calculation, so multi-path is huge in calculating effective path loss). Sending a simple signal instead of high data rate signals wouldn't have this added 24 dB though, so it does depend on what you're sending.
kch
Short paths with low data rates are easiest to calculate.
RE: what are all ral parameter to consider in a radio link path loss
RE: what are all ral parameter to consider in a radio link path loss