DX Antenna DSA-543 C-Band RF Down Converter 3.7-4.2GHz to 950-1450MHz Satcom

DX Antenna DSA-543 C-Band RF Down Converter 3.7-4.2GHz to 950-1450MHz Satcom

The DX Antenna DSA-543 is a C-Band RF down converter designed to receive signals from geostationary C-Band satellites. It accepts an input signal in the 3.7 to 4.2 GHz C-Band range and converts it to a lower intermediate frequency output in the 950 to 1450 MHz range, making it compatible with standard satellite receiver equipment. The unit is housed in a rugged die-cast aluminum weatherproof enclosure and is powered directly over the coaxial cable via DC injection (+15 to +24 VDC), a standard arrangement in outdoor satellite head-end installations. Manufactured by DX Antenna Co., Ltd. in Japan.

Specifications & What's Included

• Model: DSA-543
• Manufacturer: DX Antenna Co., Ltd. (Made in Japan)
• Type: C-Band RF Down Converter
• Input Frequency Range: 3.7 ~ 4.2 GHz
• Input Impedance: 50 Ohm
• Output Frequency Range: 950 ~ 1450 MHz
• Output Impedance: 75 Ohm
• DC Power Supply: +15 ~ +24 VDC (supplied via coax)
• Input Connector: N-Type Female (top of unit)
• Output Connector: F-Type / N-Type (bottom of unit — see photos)
• Enclosure: Weatherproof die-cast aluminum housing with mounting flanges
• Unit only — no cables or accessories included

Applications

C-Band down converters like the DSA-543 are a core component in satellite ground station receive chains, converting the high-frequency C-Band downlink signal (3.7–4.2 GHz) collected at a parabolic dish antenna into a lower L-Band IF signal (950–1450 MHz) that can be carried over standard coaxial cable to indoor satellite receivers. C-Band satellite reception was the dominant technology for direct satellite reception in the 1980s and 1990s, widely used at broadcast facilities, cable TV head-ends, TVRO (television receive-only) earth stations, and teleport facilities. C-Band remains in active use today for broadcast distribution, news gathering, and commercial satellite communications, particularly in regions where Ku-Band coverage is limited or where larger dishes are already installed. The DSA-543's outdoor weatherproof housing makes it suitable for direct LNB-position mounting on a dish feedhorn assembly. This unit is typical of the high-quality Japanese-manufactured satcom hardware of its era and remains compatible with standard C-Band satellite receivers accepting a 950–1450 MHz IF input.