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Redundant Line Driver Amplifier


Redundant Line Driver Amplifier (LDA) systems minimize system downtime due to LDA failure by providing a spare LDA and an automatic means of switching to the spare upon failure of the primary LDA. A 1:1 system provides one spare LDA for one primary LDA. A 1:2 system provides one spare LDA for either of the two primary LDAs.

Used to overcome cable losses, the systems are designed for installation at satellite earth stations in standard 19-inch EIA equipment racks. The systems are designed to house LD-5S Series C-Band LDAs.

Standard 19” rack panel, 3.5” high

Dual redundant power supplies

Worldwide AC input capability

Amplifier bias current monitoring to detect faults

Manual or automatic operation

Manual override switch control on rear panel

Serial I/O

Offline I/O with isolators

Cooling fan

Gain matching of amplifiers to ±1 dB


Variable attenuators located either at the output of each LDA or at each system path output


Automatic Mode: In Automatic mode, if a failure is detected in an online amplifier, the standby amplifier is switched on line. Typical switchover time is 100 milliseconds. For 1:2 systems, in the case that both on-line amplifiers fail, priority is selectable to either Pol 1 or Pol 2. For either 1:1 or 1:2 systems, the unit will not automatically switch to a defective amplifier.

Manual Mode: The amplifiers can also be manually switched from the front panel or remotely. In Manual mode, automatic switching will not occur upon fault detection, although the monitor and alarm circuits still function.


The systems include provision for remote status monitoring and operation. Typical uses are for sending status information to a centralized monitor and control system or for remotely controlling the system from a nearby building. All Local front panel features can be remotely controlled and monitored, except for the Remote/Local switch. In Remote mode, the front panel controls are inoperative, but the indicators continue to reflect the current operating state of the system. Remote status outputs are Form ‘C’ dry relay contacts capable of switching up to 100 Vdc at 100 mA. Remote control inputs are opto-isolator coupled for noise and common mode ground loop rejection.

Factory Reference: Redundant Line Driver Amplifier

Specific References