DA-35 & DA-36 Frequency Distribution Amplifi ers - Spectracom - #1

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USA | 95 Methodist Hill Drive | Rochester, NY 14623 | +1.585.321.5800 | sales@spectracomcorp.com FRANCE | 3 Avenue du Canada | 91974 Les Ulis, Cedex | +33 (0)1 64 53 39 80 | sales@spectracom.fr UK | 6A Beechwood | Chineham Park | Basingstoke, Hants, RG24 8WA | +44 (0)1256 303630 | info@spectracom.co.uk SWEDEN | Box 20020 | 161 02 Bromma, Sweden | +46 8 598 510 00 | info@pendulum.se Qquality.spectracomcorp.com . . . . . . . . . . . . . . I SO 9 0 0 1 DA-35 & DA-36 Frequency Distribution Amplifi ers • Low-noise and long-distance distribution of reference frequencies • Drive up to 2 km of optical fi ber • Eliminate ground current loop problems • Low-loss distribution • No noise and interference pick-up • Easy to install - fl exible, lightweight and small-diameter cable • EMP-proof • Flexible solution • Economical solution The Distribution Amplifi er systems DA-35 and DA-36 solve the problem of distributing a reference frequency from a central frequency standard to one or several receiving points. They offer frequency distribution via optical fi ber, or coax cable, with minimal jitter and are designed for reference signals, between 200 kHz and 16 MHz. The standard freqency is 10 MHz (sine). The distribution is completely analog, without the use of PLLs or other types of frequency recovery circuits that may introduce jitter or wander. The signal is reconstructed with the help of a narrowband, high-Q fi lter, which heavily suppresses noise and distortion. Advantages of Using Fiber Optics By using a fi ber optic cable as the transmitting medium, a galvanic isolation is created between the transmitting element and the receiving element, which totally eliminates ground current loops - a common problem with coax distribution systems. The fi ber is insensitive to crosstalk and ESD, and will not pick up any noise or inteference like long-line coax cables do. Optical fi bers are easy to install, with their small diameter and highly fl exible structure, compared to expensive, bulky and stiff low-loss coax cables. System Structure The DA-35 and DA-36 are designed to work with any Pendulum Frequency Standard (GPS-12R, 6688, 6689, GPS-88, GPS-89), but will also fi t all other brands, that produces a sine wave reference with an amplitude between 0.2 and 2Vrms. Spectracom offers two distribution systems: • The modular DA-35 for multipoint distribution via up to 36 fi bers from the central source. • The compact DA-36, a cost-effective point-to-point distribution solution. DA-35 Point-to-Multipoint Distribution DA-35 is modularly constructed, with plug-in boards to a rack backplane. There are two types of rack enclosures; with 10 card slots or 2 card slots. Both rack enclosures can be used either as “stand-alone” or in a 19” rack stand. The plug-in boards are either transmitting or receiving the reference signal. Transmitting boards include 4x BNC-output or 4x opto-output connectors. Receiving boards include BNC-input and a combined input/output board with 1x opto-input and 4x BNC-outputs on the same module. See fi gure 1 for an overview of a typical medium sized DA-35 system. The Pendulum DA-35 and DA-36 frequency Distribution Amplifi ers offer an economical solution to the problem of low-jitter transfer of frequency reference signals over longer distance. Whether the need is to distribute between remote buildings, fl oors or rooms, or whether the need is a big point-to-multipoint system with thousand of receivers, or just one single point-to-point distribution, DA-35 and DA-36 will do the job. Figure 1: Point-to-multipoint distribution. DA-35 has a fl exible confi - guration. DA-35 or DA-36 can be used as receivers. 1a 1c 1a 1c 1a 1c 1a 1c 1a 1c 1a 1c 1a 1c 1a 1c 1a 1c 1a 1c 60-00-2419 60-00-2420 60-00-2420 60-00-2420 60-00-2420 60-00-2420 60-00-2420 60-00-2420 60-00-2420 60-00-2420 DA-35 Transmitter Fibre Out 40x Coax DA-35 Receive unit (10-slot rack) DA-35 Transmit unit (10- or 2-slot rack) Fibre Out 8x Coax DA-35 Receive unit (2-slot rack) Fibre Out 4x Coax DA-36 up to 36 receivers Coax