Redundancy Switch Technical Notes

Novella supplies frequency converter redundant systems in 1:1 up to 1:8 configurations. These systems may be of frequency agile or block converters.

The simplest 1:1 redundant system consists of a RU03 unit with two coaxial switches mounted on the rear panel. This system has the advantages of low insertion losses and very good isolation between master and slave signal paths. This system may be used with agile or block converters.

Novella supplies also a simple 1:2 system suitable only for block converters. Two sets of three coaxial switches allow a third block converter to function as spare for two master block converters. This configuration is ideal for dual polarisation up or downlinks with L-band interface.

Novella supplies also more complex 1:1 to 1:8 redundancy systems with full RS232/RS485 monitoring and control facilities, based on redundancy switches manufactured by Double D Electronics Limited, type DDA89. These devices allow full gain and frequency control of the associated converters and remote monitoring of all these devices via a host computer.

Novella has an excellent track record of supplying all these systems customised to individual user's needs and requests. Please contact our sales personnel who will be glad to help in the search for the most suitable and cost effective solutions.

Summary of Available Redundancy Switches

• RU03: 1U chassis containing two coaxial switches and associated control circuitry for 1:1 redundancy systems of frequency agile or block converters, including four RF coaxial cables and a multiway control cable. Power taken from companion converters for lighting indication LEDs and powering coaxial relays and associated electronics. Front panel selection of master unit and manual or automatic modes. Limited control and monitoring facilities via simple hard wired parallel interface.
• RU04: 1U chassis containing six coaxial switches and associated control circuitry for 1:2 redundancy systems of block converters, including six RF coaxial cables and three multiway alarm cables. Power taken from companion converters for lighting indication LEDs and powering coaxial relays and associated electronics. Front panel selection of configuration and manual or automatic modes. Limited control and monitoring facilities via simple hard wired parallel interface.
• DDA89: Fully featured redundancy switch, configurable from 1:2 to 1:8 redundancy systems. Manufactured by Double D Electronics Limited and system integrated by Novella.