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'