Commutateur audio 2 entrées / 1 sortie
Double audio Détecteur incorporé entierement configurable pour une commutation automatique ou manuelle de secours possibilité de télécommande a distance circuit autofader atténuation automatique
Audio changeover 2 inputs /1 output
Double Audio Detector fully user-settable
Designed for transmitting sites
Fully configurable for a range of applications
Wide remote control capabilities
Complete control of stereo audio, FM multiplex / Video composite source failures
Hardware Bypass in case of AC Main failure
Internal 1kHz / 0 dB oscillator
Automatic / manual operation
GENERAL DESCRIPTION
The Merlin is designed to provide sophisticated changeover of audio signals, such as stereo pairs and even FM multiplex and video composite signals. Incoming signals are constantly monitored and if a fault is detected on the signal applied to a set Input, it will switch to a stand-by source (such as a CD), in order to keep transmissions running.
The Merlin fulfils the needs of every radio station for manual or automatic (emergency) switching between different audio sources. Multiple switching mode are provided (switch on stand-by input only when active, switch and stay on the second input, etc). Up to 7 internal relays can be associated to the audio switching for further alarm signalling, external signal routing, starting CD players etc.
Using internal and front settings, the Merlin can be easily re-configured for a variety of applications, either in the radio or in the video field. The delay times before switching and before returning to the normal state (recovery) are easily set by trimmers and jumpers.
The Merlin features both XLR balanced and PinRca audio inputs for an easier connection to either professional or consumer equipment. Each pair of PinRca inputs can be also reverted to unbalanced 'foldback' outputs. The balanced XLR output stage incorporates high-current line drivers capable to always deliver optimal signals even down long cable runs and with low load impedance. Bnc, 75 Ohm terminated connectors are available for video and Mpx signals.
Expressly designed for broadcast applications, Merlin features an hardware bypass (via relay) which connects the Input 1 pair (and the Coaxial Input 1 as well) to the Output (both XLRs and Bnc) in case of AC power failure or whenever the unit is unintentionally turned off. This prevents the transmission chain from any audio interruption.
The electronically balanced stereo inputs feature individual left / right gain controls with two bi-color LEDs enabling quick recognition of input status (no audio, audio ranging between - 6 and + 3 dBm or audio higher than + 3 dBm dB).
The Merlin is very easy to install and to operate. A '0 dB gain' mode can be selected for each output channel via front panel accessible slide switches. For fine calibration of the outputs, the source signal can be replaced by an internal 1kHz / 0 dB oscillator.
The rear panel includes a remote control / monitoring socket (optoinsulated) which may be used to connect external warning circuit. The contacts are open during normal operation and close during failure. These relays may be used to activate an external alarm in the event of a failure - even in case of missing power. An external control may be also applied to force the switching from remote.
The Merlin can be equipped with plug-in, optional modules which greatly improve its application fields: MPX decoder, Video monitor, Serial monitor and Crossfade module
