The radio link performance as described by Roger for Radio Mobile is part of the link budget. The radio link performance describes the performance of the Up- or Downlink.
A practical implementation of a link budget is described in 'How to > Link budget'
The performance of a radio link is calculated as per the following:
|T||Power of the transmitter in dBm 10 log10 (Transmit power in Watts) + 30|
|L1||Transmitter line loss in dB|
|A1||Transmitter antenna gain relative to an isotropic antenna (dBi)|
|P||Radio propagation loss from the Longley-Rice model in dB (including required fade margin)|
|A2||Receiver antenna gain relative to an isotropic antenna (dBi)|
|L2||Receiver line loss in dB|
|R||Receiver sensitivity where the voltage is used as provided by a 0 dBd dipole antenna with a impedance of 50 ohm. 20 log10
(Receiver threshold in microvolts) - 107
The performance M is expressed in dB as a value over the receive sensitivity of the receiver:
|M||Received signal in dBm - R|
M = (Tx - L1 + A1 - P + A2 - L2 ) - R
The performance can be expressed in S-Units. The S-Units can be configured in 'Options > S-Unit'