User manual SENNHEISER SR 3254

[. . . ] Instructions for use SR 3254 SR 3256 4 SR 3254 SR 3256 Contents Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SR 3254/SR 3256 transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Delivery includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Overview of operating controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Before you plug the mains connector into the wall socket, please first check that the transmitter is set to the correct mains voltage!In case of improper handling, you may come into contact with electrically conducting parts and receive an electric shock when removing the fuse holder. Before removing the fuse holder, pull out the mains connector from the wall socket. To select the mains voltage, proceed as follows: Disconnect the transmitter completely from the mains by pulling out the mains connector from the wall socket. The set voltage is shown at the top of the fuse holder. 14 Connecting the mains cable Insert the supplied mains cable into the socket on the transmitter and pass the cable through the cable grip. Note A cable grip is particularly important when the transmitter is permanently rack-mounted. Inside the rack there are often a large number of cables ­ a cable grip prevents the cables from pulling each other out. Using transmitters in a multi-channel system You can combine several transmitters to make a multi-channel system. the AC 3000, see "Accessories" on page 29) which allows you to combine the signals of up to four twin receivers onto a single antenna (see diagram below). For detailed information on setting up a multi-channel system and on connecting the transmitters, please refer to the operating manual of the antenna combiner. ANT RF OUTPUT 8:1 15 Mounting and connecting remote antennas Use a remote antenna when the transmitter position is not the best antenna position for optimum transmission. You can choose between two antennas (see "Accessories" on page 29): A 2003 UHF passive directional antenna A 1031 passive omni-directional antenna A 2003 Use a low-attenuation 50- cable to connect the antenna to the transmitter. Ready-made antenna cables from Sennheiser are available as accessories with length of 5 m and 10 m. If possible, use a short antenna cable and as little connections as possible, since long cables and many connectors lead to an attenuation of the antenna signal. Position antennas in the same room in which the transmission takes place!Maintain a minimum distance of 1 m from metal objects (including reinforced concrete walls)!Connecting the mixing console Connect the mixing console to the XLR-3 sockets AF IN (L) and AF IN (R) + MONO . Note Any unit that is only suitable for mono operation must be connected to the XLR-3 socket AF IN (R) + MONO . In this case, set the transmitter to mono operation (see "Switching between mono and stereo operation" on page 22). A 1031 16 Using the transmitter Switching the transmitter on/off Press the POWER button ¾ to switch the transmitter on or off. After switch-on, the LC display is backlit and the last transmission frequency set is displayed. Until the PLL has locked on the desired transmission frequency, the transmitter is muted. "MUTE" appears on the display and the LCD bargraph for RF output power (RF) ´ indicates 0 %. Note The POWER button ¾ works in the secondary circuit of the integrated mains transformer, and thus only switches the low voltage side. For larger installations with several transmitters, a complete mains disconnection can best be achieved by a central ON/OFF switch. 17 Connecting the headphones/monitoring the audio signal Attention! [. . . ] HDX has been specially developed for high quality radio microphone systems. Note: Only transmitters and receivers that are equipped with HDX can work correctly with each other. If non HDX equipment was mixed with HDX, the dynamic range would be drastically reduced and the transmission would sound blunt and flat. 26 Specifications RF characteristics Frequency ranges Transmission frequencies 518­554, 626­662, 740­776, 786­822, 830­866 MHz 1 channel bank with up to 16 factory-preset channels 1 channel bank with up to 16 freely selectable channels (frequencies tunable in steps of 5 kHz) 36 MHz ±10 ppm (-10°C to +55°C) BNC socket, 50 max. 100 mW Switching bandwidth Frequency stability Antenna output RF output power AF characteristics Modulation Noise reduction system Nominal/peak deviation FM stereo working on the pilot tone principle Sennheiser HDX ±24 kHz / ±48 kHz 19 kHz / ±5 kHz 40­15, 000 Hz ¼" (6. 35 mm) stereo jack socket, 200 mW/32 16 2 x XLR-3, electronically balanced > 90 dB(A)rms (refers to overall link with EK 3253) < 0. 9 % MPX pilot tone (frequency/deviation) AF frequency response Headphone output Load impedance of headphone output AF input Signal-to-noise ratio THD (at 1 kHz and nominal deviation) AF input voltage (at nom. 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