Optical Remote Antenna

概述

Optical Remote Antenna

Optical Remote Antenna

Optical Remote Antenna



■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


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