The Comtech EF Data (CEFD) UT-4518 Up Converter is the ultimate in high-performance and cost effective Ku-Band frequency
conversion. The UT-4518 can be used for SCPC, DAMA, and TDMA, as well as full transponder HDTV and analog TV. Spectral purity
and stability characteristics fully meet or exceed the requirements of all domestic, international, and regional commercial satellite
networks, including the Eutelsat Hotbird™ family.
The UT-4518 has +10 dBm minimum output level at the 1 dB
compression point and 35 dB of gain as a standard. This capability
permits longer cable runs to the modem rack or compensates for
elaborate splitting networks without adding expensive options such
as external line amplifiers.
Low Phase Noise
The phase noise performance of the UT-4518 exceeds the Intelsat
phase noise mask for IBS and IDR services by more than 6 dB.
This allows phase dependent demodulators to perform better. The
close-in phase noise is very low, making the converter ideal for low
bit rate digital circuits such as those used in DAMA hub earth
The remote control interface is selectable between EIA-232 and EIA-485. All configuration control, status retrieval, and adjustments are
available as simple ASCII commands through the serial interface or through the front panel menu. As a cost option, the remote control
command structure can be customized in order to accommodate existing network control software.
Detachable RF/IF Connector Module
Each UT-4518 is equipped with a detachable I/O Module (IOM) that establishes input and output connections for the RF and IF paths.
The module inserts into a rear compartment of the converter, and requires no additional outside space. The module includes a SMA
connector for the RF path and a BNC connector at 50 or 75 Ω for the IF path.
Daisy Chain Redundancy Switching
The converter uses CEFD's proprietary "Daisy Chain” integrated switching technology. The Daisy Chain design removes the relays
associated with a centralized protection switch tray and distributes them across the individual converters. CEFD was awarded patent
5,666,646 on this distributed protection switch topology.
Daisy Chain technology successfully eliminates a central switching chassis, two power supplies, a microprocessor, and several long,
costly cables. Widely accepted in the industry, CEFD’s Daisy Chain provides both pricing and marketing advantages.
Minimum Rack Space
Due to its small rack height (1.75 inches) and the elimination of the space penalty paid for a separate 1+N switch chassis, the UT-4518
and the Daisy Chain switch architecture provide the most compact and cost effective converter subsystem available. The units are ideal
for the construction of transportable systems such as “flyaways,” and high capacity earth stations where space utilization and economy
are prime considerations.