Thor Broadcast F-RF-RX-RM Rack-Mount CATV RF Fiber Receiver | High RF Output Power | 1310 or 1550 nm Input

Rack-Mount Receiver for Headends

When fiber from a main headend lands in a building that then feeds a large coaxial plant, the receiver has to deliver real output power. The Thor F-RF-RX-RM is a rack-mountable optical receiver for the cable television band that converts CATV RF carried over fiber back to electrical RF on coax. It is designed to work with Thor F-RF-TX directly modulated transmitters at the other end of the link.

Reception, Gain Control and Quality

The receiver accepts signals across 1310 to 1568 nm, covering the 1310 and 1550 nm bands, with return loss above 55 dB. Optical automatic gain control holds output levels steady as plant loss changes, and a microprocessor manages all working parameters. Link figures are CNR above 50 dB over 10 km of fiber, CTB below -63 dB, CSO below -57 dB and SBC restraint above 17 dBm on a PAL-D 60 or NTSC 80 channel load.

RF Output, Band and Management

Work bandwidth is 45 to 862 MHz with flatness within 0.75 dB and 75 ohm impedance at return loss above 16 dB, using an F-type interface or another connector by request. Input level is 19 to 21 dBmV under manual gain control. Management is available over RJ45 and RS232, supporting browser access and SNMP, so a secondary headend can be monitored from the same system that watches the main site.

Chassis, Power and Redundancy

The unit measures 19 by 10 by 1.75 inches, a single rack unit in a standard frame. Power is 90 to 265 V AC with an optional -48 V DC input between 30 and 60 V, and consumption stays under 50 W. Working temperature is -5 to 65 degrees C with storage from -40 to 85 degrees C and humidity from 5 to 95 percent. A second redundant power supply can be added where the link is critical.

Typical Installations and Connection

Building equipment rooms, secondary headends, hotel and hospital television systems and campus distribution points are the usual homes for this receiver, with its RF output driving amplifiers and splitters on the local coaxial plant. Thor lists the unit as F-RF-RX-RM. Use SC/APC angle-polished connectors on the optical port, and fit a PC to SC/APC jumper where the incoming fiber is terminated in flat connectors.