Comtech LGAN C- or Ku-Band Block Up Converter

Overview
Our extensive experience in the design of outdoor Block Up Converters led to the GaN-based LGAN family’s efficient thermal and mechanical package. Recognizing the evolution of L-Band IF systems, the LGAN is designed to eliminate the traditional requirement for the modem to supply a DC power source and a 10 MHz reference to the BUCs and LNBs. The LGAN’s optional internal reference and LNB bias T greatly simplify multi-carrier operation and provide cost-effective redundant solutions. The LGAN offers valuable features not found in other L-Band BUC products. Multiple power levels are offered, up to 500W in C band and 400W Psat rated in Ku band.

Optimized for Multi-Carrier/Multi-Transponder Operation
When used for Multi-Carrier/Multi-Transponder applications, Gallium Nitride power devices historically have caused problems with intermodulation performance. The LGAN addresses this challenge and is available with two options:
• Option 1 – Optimized to provide the maximum linear power possible for single carrier applications
• Option 2 - Provides virtually the same intermodulation performance whether the carriers are 5, 50, 150(or more) MHz apart

Optional Single and Multi-Band LNB Support
The LGAN was designed with the evolution of L-Band systems in mind. No longer relegated to low power single carrier installations, L-Band IF topologies are now found in larger multi-carrier installations. A challenge presented by multi-carrier L-Band systems is the presence of DC and reference components on the TX/RX L-Band interfaces. The LGAN design, by default, eliminates the DC component from the TX IF and can eliminate the reference requirement with the optional internal OCXO. The LNB bias/reference option completes the solution by eliminating DC and reference signal requirements from the RX L-Band interface. We also offer a high-stability “Multi-Band” Ku LNB facilitating global Ku-Band downlink coverage controlled by the LGAN M&C.

Redundancy
Another challenge addressed by the LGAN topology is the increasing need for redundant L-Band RF solutions. With its internal power supply, internal reference and internal LNB bias capability, the LGAN offers a very cost-effective solution for 1:1 redundant TX and 1:1 redundant RX requirements.

Data Logging Capability
To greatly enhance system maintainability, the LGAN line includes a built-in data logging capability. By recording critical operational parameters (such as temperature, output power, mute status, etc.) at time stamped intervals, the user can quickly gather intelligence not only about the unit itself, but also the unit’s operational environment.

Advanced FSK
When used with our modems, the LGAN provides valuable additional functionality utilizing the industry standard FSK communications channel. This feature offers full control of single thread and redundant systems from the modem front panel without additional cabling or cost. The LGAN can also be accessed from the Ethernet port of the modem and controlled via Embedded Distant-end Monitor and Control (EDMAC).

Optional Internal 10 MHZ Reference
With the optional high-stability, ovenized reference oscillator (OCXO) installed, one more signal is removed from the TX IF cable. This ensures optimum RF performance of the BUC by eliminating any reference degradation caused by IF combiners, interconnections or rotary joints.