Finding Pathloss from Tx and RSSI???

[luckyali]

Finding Pathloss from Given Tx-power and RSSI values???

Hallo experts,

F = 5.03Ghz
D = 1 meter
Tx = 30 dB
RSSI = -50 dB
These values are taken from real transmitter and receiver in the Lab.

Question: Placed 1 m apart from each other and communicating @ 5.03Ghz, If a transmitter power is set to 30 dB and the measured Received Signal Strength is -53 dB. What is the Actual Path Loss???

Best regards
Ali

 

[vfone]

Knowing the TX and RX levels in dBm (or Watts), and frequency and distance, is not enough finding the free space path loss.
You need the gain of both antennas (TX and RX), and if the TX power and the RX RSSI were calibrated up to the antenna connector, you need to know (if is the case) the loss between antenna and the antenna connector.
https://www.changpuak.ch/electronics/calc_10.php

 

[luckyali]

In our lab we are using USRP2 devices as a Transceiver at both ends.

These devices are equipped with a Dual Band 2.4 to 2.48 GHz and 4.9 to 5.9 GHz omni-directional vertical antenna, at 3dBi Gain.
Regarding your last point of loss b/w antenna and antenna connector, any suggestion how I can get to know about it.

 

[vfone]

At these relative high frequencies (2.4GHz and 5.9GHz) for accurate measurements of the conducted path loss between antenna connector and antenna, you need a Network Analyzer.
You can get an approximate value of the loss, if you have the datasheet of the coax cable used by your system, and calculate from there the insertion loss for the used cable length.