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  • SatService: sat-nms L-Band Distributor [LRXD]

sat-nms LRXD L-Band Distributor

The sat-nms LRXD L-Band Distributor has two functions in professional satellite ground stations. It provides the redundant supply voltage for the Low Noise Converters (LNC) and distributes the receiving signal to multiple outputs at which the satellite receivers are connected.

The compact version sat-nms LRXD-14 is designed for satellite ground terminals where a 19" rack-mount unit is not possible due to space limitations, for example, in mobile satellite news gathering terminals. The unit provides: 

  • An active 0dB L-Band distributor with 4 L-Band output ports with mixed 50Ohm SMA and 75Ohm F connectors
  • 14/18V and 22kHz tone switching initiated by contact closure interface, LNB’s polarisation and frequency range
  • An external supplied 10MHz reference is mulitplexed on the L-Band interface to the LNC if applied to 10MHz input
  • The unit is powered by external 24V DC that are available in all satellite ground terminals

Internal amplifiers compensate the loss of the distribution circuit. The signal distribution is realized with cascaded Wilkinson dividers that guarantee good frequency response and isolation between the different output ports.

The models sat-nms LRXD-18, sat-nms LRXD-28 and sat-nms LRXD-116 (1RU) include two power supplies with two independent mains voltage input connectors. The internal redundancy switchover between the two power supplies improves the availabilty of the unit.

Model variants

The following versions of the sat-nms LRXD are available. All are delivered in a one HU rack drawer:

  • sat-nms LRXD18-50: is connected to one LNC and provides 8 outputs with 50Ohm SMA output
  • sat-nms LRXD28-50: allows the connection of two LNCs and provides per LNC 8 outputs with 50Ohm SMA output
  • sat-nms LRXD116-50: is connected to one LNC and provides 16 outputs with 50Ohm SMA output
  • sat-nms LRXD18-75: is connected to one LNC and provides 8 outputs with 75Ohm F output
  • sat-nms LRXD28-75: allows the connection of two LNCs and provides per LNC 8 outputs with 75Ohm F output
  • sat-nms LRXD116-75: is connected to one LNC and provides 16 outputs with 75Ohm F output
  • sat-nms LRXD14: is connected to one LNC and provides 4 outputs with mixed 50/75Ohm and SMA/F outputs

The versions sat-nms LRXD18, sat-nms LRXD-28 and sat-nms LRXD116 equipped with two redundant power supplies are provided in an 1 HU rack-mount chassis.

Features LRXD18/28/116

  • 19" 1 rack unit compact design
  • One or two distributors in one unit
  • Redundant power supplies
  • DC free/protected outputs (no damage by IRD LNC supply voltage)
  • Electronic overcurrent protection
  • High and low current alarms
  • Adjustable alarm threshold
  • Relay contact outputs for all alarms
  • Alarms can be used for redundancy switching
  • Monitoring Output @ 0dB at the front panel
  • LNC current monitoring

Applications LRXD18/28/116

  • VSAT-HUB
  • SNG Central Station
  • sat-nms LRXD28 as compact design for satellite news gathering transportable stations
  • TV-Uplink
  • Teleports
  • Connection of two LNC's, e.g. for both polarizations, to 1 RU Unit