Reported RSSI more than 3 dB off the expected RSSI: There may be a alignment problem with the antenna, especially if both sides of the link show the same symptom. Solution: Realign the antenna(s). Opmode must be on at the remote side of the link to do alignment of the local side. Ensure that ATPC is off and that after the alignment is completed the alignment mode is turned off.
Are both radios mounted on the same polarization? Licensed radios must be mounted with matching polarizations at each end of the link. If one side is mounted on the antenna differently than the other side, the link will not lock or the signal level will be 30 or more dB lower than expected. For SL24, the radios must be installed cross-polarized, where one side is mounted H and the other V.
Giga: Target RSSI setup may be set incorrectly. It should be set about 3 to 5 dB lower than the actual RSSI so that the Giga will set it’s RX gain for optimum noise figure and input level.
Apex & Giga only: Is the waveguide transition installed properly? The rectangular openings on the Apex or Giga/SP ODU and transition must be lined up, and the transition tightened properly. Remove and reconnect if not. This is shown in the manual.