topic Thank you for the answer in Wireless

Math behind result

michal.dudzak — Mon, 05 Jul 2021 12:00:51 GMT

Hello,

Can anybody explain math behind result of this qestion for wireless newbie? What is the simpiest way to solve this situations and how i can solve similiar real life situations like this? I understand what is dBm in reference to mW (or lets say how to conver that) what is dBi and cable loss however i dont see logic behind this.

How signal from transmitting 28dBm (631mW) can appear on other side as -45dBm. (0,0000316mW) when i tested this in real life i litterary put my device on the ap sticking them together and RSSI on device still were -25dBm at best. Is there such a big loss when only distance is plastic separating device and ap?

Keith Barker introduced wery simple math of converting dBm to mW (06- dBs and Watts - 200-355 CBTnuggets) is it possible to apply his math on this example?

Sincerely Michal

There is one piece of

Rasika Nayanajith — Sun, 08 May 2016 20:36:54 GMT

There is one piece of information is missing in this question. What is the Free space loss in this scenario (typically based on Freqency & distance between Tx & Rx)

Receiver Signal level = Transmitter Signal level + Cable loss at Tx + Tx Antenna Gain + Free Space loss + Rx Antenna Gain + Rx cable loss

HTH

Rasika

Refer the link : http://www

mohanak — Mon, 09 May 2016 01:12:09 GMT

Refer the link : http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/23231-powervalues-23231.html

Thank you for the answer

michal.dudzak — Mon, 09 May 2016 12:38:19 GMT

Thank you for the answer Rasika, iam glad that person as yourself joined this this discussion. How is possible to come out with correct answer if one puzzle for math pattern is missing. Should i have to estimate answer? I have no idea how...