Comtech-ef-data LNB User Manual download pdf (Page 14)

LNB Low-Noise Block Downconverter Revision 0

Introduction MN-LNB

1–2

1.2 Technology

The amplifiers incorporate both HEMT (High Electron Mobility Transistors) devices for Low-

Noise temperature performance and GaAs FET (Gallium Arsenide) devices for low

intermodulation. The unit uses surface mounted components for robotic manufacturing

techniques, thereby insuring maximum product consistency and enhanced reliability.

1.3 Reliability

The Comtech EF Data LNB series utilizes proprietary circuitry and high quality components to

achieve an MTBF (mean time between failures) in excess of 160,000 hours. Each unit is

subjected to a 72 hour burn-in and temperature cycled from -40 to 140°F

(-40 to +60°C).

1.4 Construction

The LNB is housed in a waterproof enclosure with a small profile to better accommodate

redundancy configurations. The enclosure also provides a pressurizable, integral waveguide

flange.

1.5 Functional Description

Features:

• Flexible configuration

• Low phase noise - Meets or exceeds MIL-188-165A

• Noise Figure options

• Gain options

• Output power options

• Transmit Reject options

• Optional Fault Reporting

• Mates directly to LPOD family of BUCs for DC supply, 10MHz source

• Optional 1:1 Redundancy

The LNB is a field-interchangeable block downconverter module that translates a band-specific

frequency block, in this case, X-Band, from the antenna down to L-Band (950 to 1450 MHz).

The LNB requires a +12 to +24VDC source and high stability 10MHz reference source supplied

via coaxial cable with external tri-plexer. DC power can be supplied via optional 4 or 6 pin

connector with 10MHz reference delivered via external di-plexer.

10 MHz reference should provide sinewave output at 0, +-5dBm.

Reference phase noise:

<-125 dBc 10Hz

<-152 dBc 100Hz

<-160 dBc 1KHz

<-165 dBc >10KHz

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Comtech-ef-data LNB User Manual Page 14