Parallel Architecture

Since solid-state power amplifiers (SSPAs) consist of multiple transistors in parallel, they naturally contain a degree of built-in redundancy. With proper attention to design architecture, the use of multiple parallel RF modules, and the elimination of all active devices from the common RF path, VertexRSI has designed an SSPA that is reliable and extremely fault-tolerant.

RF Plug-In Modules

QuadMod SSPAs consist of four identical and fully interchangeable RF plug-in modules. Module status is indicated by an LED on each module as well as the control panel display.

Complete failure of a module causes a drop of only 2.4 dB in output power, without the momentary loss of signal caused by redundant switchover systems. Defective modules can be hot-swapped while the SSPA continues to operate. Spare RF modules are affordable, since they contain only a fraction of the RF power transistors in the SSPA.

Easy to Operate and Maintain

QuadMod SSPAs are designed to be easy to operate and maintain. Commonly used controls are brought out to the front panel for quick and easy access. All features are fully remote controllable through the standard RS-232/-422/-485 and network interfaces.

Servicing is fast and easy with four hot-swappable RF modules that are accessible from the front panel. Modules can be removed and replaced while the SSPA continues to operate.

Any of the four fans in the air-cooling system can be easily removed and replaced, without taking the SSPA off-line. Even the power supply is N+1 redundant, consisting of three hot-swappable plug-in modules, any two of which are fully capable of powering the entire amplifier.

Phase-Combined Systems

QuadMod is easy to expand. Phase-combine two SSPAs for double the power output in only 35" (20 RU) of rack space. An added bonus—with 8 RF modules, one failed module causes only a 1.2 dB drop in output power.

Cooling System

QuadMod also incorporates redundancy into its integral forced-air cooling system. Enough margin is built into the design to tolerate the loss of one cooling fan. Fans are monitored for rotational speed, and failure of a fan is indicated on the control panel display. In the event of a fan failure, the SSPA can continue to operate until a replacement is installed. The air cooling system utilizes separate front panel air intake and rear panel exhausts. Exhaust air can be ducted outdoors or into the room.

Power

System power is supplied by three identical modules in an “N+1” configuration. If a module fails, the remaining two can supply 100% of the required load current and the defective module can be hot-swapped without interruption. QuadMod operates from either single- or three-phase ac, allowing considerable flexibility in installations and worldwide operation.

Global EMC and Safety Compatibility

QuadMod SSPA systems are certified to applicable EU EMI/EMC and safety standards.