Long Distance L-Band HTS Link System

The ViaLiteHD long distance L-Band HTS (700-2450MHz), DWDM link system is designed to connect antennas directly to control rooms up to 100km away.  Using amplification stages and dispersion compensation, a total distance of 600km is possible.

  • Ideal for Ka-Band diversity antennas – to combat rainfade
  • End-to-end system design available
  • Up to 100km link distance or 600km with amplification and optical dispersion compensation
  • DWDM capable allowing 4-80 links per strand of fiber
  • Ideal for 500MHz and 800MHz bandwidths used in High Throughput Satellites (HTS)
  • LNB/BUC power & on-module LNB switching options
  • Extreme temperature operation
  • True Plug and Play
  • Complete range of DWDM complementary products available
  • 5-year warranty as standard
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Long Distance L-Band HTS Link System

Solution for rain fade

Antennas and control rooms can be located at geographically diverse locations for a number of reasons such as terrain, cost and as a solution to rain fade for high frequency satellites. Rain fade (also known as rain attenuation) is when bad weather affects a high-frequency Ka-Band signal at the antenna location, disrupting data feed. The use of long distance links allows Satellite Operators to choose between sites for optimal transmission conditions, so the signal from another location (where it is unlikely the weather will also be bad, at the same time) can be used instead.

Find out more

 

Ultra-wide dynamic range

One of the link’s key features is the ultra-wide dynamic range. This allows wider bandwidths to be transmitted, for example High Throughput Satellites (HTS); typically 500 or 800MHz. Demand for increased capacity in satellite communication continues to drive the industry to use HTS at these higher frequencies, such as Ka-Band, which is particularly susceptible to rain fade.

Due to the complexity of these systems, ViaLite offers system design and installation assistance. Please contact us for details.

 

Manned from a single control room

ViaLiteHD long distance links can also be controlled remotely using SNMP or Ethernet. This means multiple, unmanned teleport sites can be manned from a single control room, opening up new possibilities for teleport design.

 

DWDM – 80 links per fiber

The optional use of Dense Wave Division Multiplexing (DWDM) allows up to 80 links to be sent along a single fiber.  These can be setup for short interfacility links (IFLs), as well as over long distances. The DWDM massively reduces the fiber count, minimising fiber leasing/operational costs.  DWDM requires the use of multiplexers, amplifiers and dispersion compensation.

Hardware formats

The L-Band HTS Long Distance link is available in a couple of formats:

– Single rack chassis card / Dual rack chassis card (Rx/RX, Tx/Tx or Rx/Tx)

A fully populated 19” 3U ViaLiteHD rack chassis supports up to 26 links and accepts 13 RF cards, plus an SNMP card and dual power supply modules.  A 1U chassis accepts three RF cards or two RF cards with an SNMP card.

– Yellow OEM Link

The Yellow OEM Link has been designed for system integrators and equipment manufacturers to build the link into their own designs.

A range of support modules and accessories is also available, including indoor rack chassis units and weatherproof outdoor enclosures.

See our hardware formats guide for more information.

 

Options include:

  • 50Ω electrical connectors: SMA, MCX (only available on modules) or BNC
  • 75Ω electrical connectors: BNC, MCX (only available on modules) or F-type
  • Optical connectors: SC/APC or FC/APC
  • Test ports on Tx & Rx modules
  • LNB powering through RF connection
  • Optional blind mate connectivity
  • LNB control circuit with 13/18VDC & 22kHz tone.

RF Performance Characteristics

 L-Band HTS link (50Ω)L-Band HTS link (75Ω)
Frequency range950-2150MHz950-2150MHz
Impedance, RF connector50Ω SMA, blind mate75Ω BNC, blind mate
VSWR1:1.5(typ)1:1.5(typ)
Link gain (TX gain / RX gain)+11 (0 / +11) a h +11 (0 / +11) a h
Flatness (full band, 100km, no DCF)±0.5dB (typ) a h ±0.5dB (typ) a h
Gain stability0.25 @ 24hrs dB (typ)0.25 @ 24hrs dB (typ)
P1dB input+1.5dBm (typ) a k +1.5dBm (typ) a k
IP3 input+13.5dBm (typ) a k h +13.5dBm (typ) a k h
Noise figure (default gain)17dB (typ) a h 17dB (typ) a h
SFDR 114dB/Hz ⅔ (typ) a 114dB/Hz ⅔ (typ) a
Max RF input power without damage15dBm15dBm

a nominal input power @ 0dB optical loss
h default gain setting
k measured @ 1.2GHz

 

Optical Performance Characteristics

 L-Band HTS link
Laser typeHigh power distributed feedback (DFB) laser, thermo electric cooled
Optical wavelengthFull ITU, DWDM range of wavelengths are available
See manual for details
Optical power output10.8dBm (typ) - E laser
7dBm (typ) - D laser

 

Temperature Characteristics

 L-Band HTS link
Operating temperature-20degC to +70degC
Storage temperature-40degC to +85degC

L-Band HTS – 50 Ohm DWDM Medium Power (version HRx-Lx-DCxx-DS-1)
L-Band HTS – 50 Ohm DWDM High Power (version HRx-Lx-ECxx-DS-2)
Yellow OEM datasheet  (version HRx-xx-xN-1)
ViaLiteHD RF Link Handbook  (version HRx-HB-6)

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