Comtech EF Data LBC-4000 L-Band Up/Down Converter System
The Comtech EF Data LBC-4000 L-Band IF to 70 MHz IF (140 MHz optional) indoor converter is a 1RU 19-inch chassis with
two front panel accessible up converter or down converter modules. It contains two diode “OR-ed” internal
power supplies, for increased reliability and microprocessor-based Monitor & Control (M&C) functions.
The LBC-4000 up converter module translates a 70 MHz IF input signal (140 MHz optional) up to a userselected
frequency at L-Band (950 to 2000 MHz). The L-Band output can drive the input of the Comtech EF
Data MBT-4000 block up converter or other RF equipment with an L-Band input.
The LBC-4000 down converter module translates an L-Band (950 to 2000 MHz) IF input signal down to a
user selected frequency in the 70 MHz (140 MHz optional) IF band. The LBC-4000 can be locked to an
internal reference or an external 5 or 10 MHz reference signal. The LBC-4000 is an excellent choice for
interfacing legacy 70 or 140 MHz equipment to quad-band or tri-band block converters.
The LBC-4000 is rack mounted in a standard 19-inch equipment
rack. External equipment, such as a modem, is connected to each
internal converter module by a low-cost coaxial cable. A coaxial
cable is also used to connect the output of each module to RF
equipment either in the same location or at the antenna location.
MBT-4000 Multi-Band RF Transceiver
A companion to the LBC-4000 is Comtech EF Data’s Multi-Band RF Transceiver (MBT-4000), which is designed to perform C-, X-, or Ku-
Band RF to L-Band down conversion and L-Band to C-, X-, or Ku-Band RF up conversion. The MBT-4000 features:
RF band switching in minimal time without requiring
Minimal cost for a complete system including spares
Easy expansion for providing a redundant system or
other frequency bands
Rugged construction for mobile and transportable
Automatic band identification for the BUC, BDC, and
antenna feed (if the feeds provide an identifying
Meets or exceeds MIL-STD-188-164A
Low phase noise
No spectral inversion
10 dB gain adjustment
Auto band sensing capability
Easy system status verification via LEDs located behind a removable cover
up and down conversion which can be “Chain switched” with external amplifiers and LNA/LNBs