N+1: Cost Effective Automated Transmitter Backup

To help ensure that broadcasters stay “On Air ” Nautel designs extreme reliability and redundancy into all Nautel transmitters. However, for facilities that broadcast multiple programs from a single site, N+1 capability can provide even higher levels of redundancy that is both automated and cost effective. Nautel N+1 configurations can support up to six identical main transmitters plus a backup transmitter serving outputs of 300 watts to 40 kilowatts of solid-state power.

N+1 Solution Features and Advantages

4+1 Implementation Example

In this example four Nautel NV series FM broadcast transmitters (A through D) plus one backup transmitter are configured with a series of coaxial switches that are part of a 4+1 switch matrix, RDS and audio program switchers, and a Nautel SC1 system controller.


Each transmitter (A through D) operates individually at one frequency between 87.5 MHz and 108.0 MHz. The system is designed to allow the backup transmitter to be used in place of any one of the main transmitters in the event of a main transmitter failure. The +1 transmitter can back up only one transmitter at a time. A 50 kW dummy load acts as the dummy load for the backup transmitter or the transmitter that the backup is replacing.

The Nautel SC1 System Controller provides system control and monitoring functions for up to six NV-series FM broadcast transmitters connected in an N+1 configuration. When the SCI recognizes a fault condition that has inhibited output power of any of the 4 NV transmitters, the SCI inhibits the faulty transmitter and transfers it to a dummy load. The audio, SCA (if applicable) and RF are all switched to the +1 transmitter which begins broadcasting the faulty transmitter’s channel.

The user can prioritize which transmitter is being backed up in the event of failure of more than one transmitter. For example: If transmitter 1 failed and had a higher priority over the other transmitters and the + 1 transmitter was currently backing up transmitter 2, the SCI would switch to broadcasting transmitter 1 channel. Transmitter 2 would be sent to it’s antenna port and disabled. Transmitter 1 would be inhibited and sent to the dummy load (there is only 1 dummy load).

Additional Implementation Details

Remote Control Circuits

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