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Optical Remote Antenna

概述

Optical Remote Antenna

The receiver modulate and transmit non-modulated light sent from a transmitting station to a duplex TV relay station by using radio waves being received. It is epoch-making radio-wave receiver-transmitters where highly sensitive optical modulators are used.

Outline

Optical remote antenna has been commercialized through joint development with NHK and NHK ITEC Inc.
The receiver modulate and transmit non-modulated light sent from a transmitting station to a duplex TV relay station by using radio waves being received. It is epoch-making radio-wave receiver-transmitters where highly sensitive optical modulators are used.
Optical fibers are used as transmission lines. They eliminate the use of power supplies for the receiving stations, and electrically isolates the transmitting stations from the receiving stations. It brings a substantial benefit in preventing the occurrence of damage due to lightning. Use of passive circuits only in the receiving station improves reliability and serviceability.

Features

· No need to supply power for the receiving station in a duplex TV relay station

· Reduce risk of damages caused by lightning

· Significant reduction in maintenance work for receiving stations

Applications

· Radio-wave transmission systems in FM, VHF and UHF bands

Item		Standard Specifications
Transmission Frequency		Specify one or two channels between channels 1 to12 and channels 13 to 62.
Transmission Distance		2,000m (maximum)
Fibers Used		Single mode
Optical Wavelength		Bandwidth : 1.3μm
Light Source and Optoelectronic Section	Light source	LD-excited YAG laser
	Rated Level of Output Optical Signals	23dBm
	Optical Connector	FC/PC connector
	RF Output Level	60dBm ±20 (variable by 10dB)
	RF Output Impedance	50TNC-J
	CN Ratio VHF Band	Over 50dB (Receiver RF input level: 60dB μV, Measurement frequency band: 6MHz)
	CN Ratio UHF Band	Over 50dB (Receiver RF input level: 65dB μV, Measurement frequency band: 6MHz)
	DP	±3°
	DG	3%
	Supervisory Signal Detection	Make contact
	Operating Temperature Range	Operational temperature range where performance is guaranteed -10 to +45 °C (working temperature range)
	Power Supply	AC 100V, 50/60Hz, 130W (room temperature)
	Dimensions	Body: 149(H) x 480(W) x 350(D)mm Fan unit: 49(H) x 480(W) x 350(D)mm (full projections excluded)
	Weight	Body: approx. 10kg, Fan unit: approx. 2kg
Receiving Sensor	Optical Connector	FC/PC connector
	RF Input Level	60±20dBμV
	RF Input Impedance	50 (N-J connector)
	Dimensions	49 (H) x 480 (W) x 250 (D)mm (full projection excluded)
	Weight	Approx. 4kg