Relay Compositions of DTV Relay Stations

Product code：6553FA

　

Outline

This is 5W SCPA for the relay station of ISDB-T Digital Terrestrial Broadcasting. Because the main body can mount two units, it excels small in the mounting efficiency, and the miniaturization can be attempted.

Structure

Main body (PA21SR) mounting type
External size: 214.6(W) x 99(H) x 404.5(D)mm (Excluding protrusions)
Mass: 8kg or less

Specification

(The I/O level is a mean value.)

Input	Band width	Specified single channel between 470MHz to 770MHz
	Impedance	50Ω/TNC type (Unbalance)
	Level	-10dBm
Output	Band width	Same channel as input
	Impedance	50Ω/TNC type (Unbalance)
	Standard gain	+47dB
	Standard level	5W (1-OFDM wave of a specified channel)
	Monitor	-35dB±1dB against output level
	Monitor connector	BNC type J
Power supply voltage		DC +48V±15% or less
Power consumption		150W or less
Environmental requirements	Temperature	-10°C to 45°C (Range for in-spec)
		-20°C to 60°C (Range for spec restorable)
	Humidity	45% to 90% RH (Without dew.)
Cooling method		Forced air cooling
Use conditions		Continuous use

Performance

I/O VSWR		1.2 or less (Do not destroy by shorting or opening the input-output terminal.)
Amplitude-frequency characteristics		0.5dBp-p or less(Within using band)
IM		-50dB or less (When OFDM1 wave 5W is output)
Changeable gain range		-6 dB or less from +2 dB or more finishes must being changeable compared with 5W.
Output fluctuation		Within ±0.5dB in the performance guarantee temperature.
Alarm monitoring item (At mounting on PA21SR)	Power failure	Each DC voltage of power supply part is observed and warning is output by the change of ±20% or more.
	Output abnormal	When the output becomes following the setting, warning is output.
	PA abnormal	Each FET current are observed and When it changes to -30% or less of idol (current at a no signal), or to +30% or more of the current outputs ratings, the FET current is intercepted; warning is output, and maintained.
	FAN abnormal	When fan is stopping, or becoming 700mi-1n or less (designed value), warning is output.
	Temperature abnormal	When the FET temperature becomes +85℃, the FET current is intercepted; warning is output, and maintained.
	Alarm interface (At mounting PA21SR)	Non-voltage contact outputContact rating DC24V, 0.1A or less(ALARM)D-sub 15S M2.6 screw
Meter output (At mounting on PA21SR) /Meter rating Full scale 300mV/1.5kΩ	Level	200mV is output to 1.5k load when ratings are output,
	Power supply voltage	96mV is output to 1.5k load when +48V.
	FET current	60mV is output to 1.5k load when 1.0A.
	Connector	D-sub 9S M2.6type

Function

  This equipment is a power amplifier for a single channel that amplifies the output of the transmission conversion to regulated transmitting power at the relay station of ISDB-T Digital Terrestrial Broadcasting.

  This 2 equipments can be mounted on 1 main bodies (PA21SR), and can correspond to the relay broadcasting system of 2 method.
  Because this size is the rack mounting type of JIS 2H and a half size unit construction, it contributes to the miniaturization, and it has the flexibility of the right and left division of the first method and the second method etc. when the rack is mounted.

  It provides with the watch and the control operation in accordance with the transmission equipment commonness specifications for the digital terrestrial broadcasting (Orange Book), and it is possible to connect it with the PA switch control equipment etc. Moreover, it has the function to output the output level, the power-supply voltage, and the FET current as DC voltage to display it to the meter.
  Steady operation is possible, because the fan for the forced air cooling that can be exchanged is installed at front side, forward.
  And the inside design is considered the ventilation efficiency.