Repeater Compositions / ISDB-T Digital TV Broadcasting Relay Systems

Product code: 6552FS

Outline

This equipment is a main body to use 5W PA by a parallel-synthetic method in the relay station of ISDB-T Digital Terrestrial Broadcasting. 3 distributors, 3 synthetic equipments and the controller that alarm-processes and controls each PA are installed in this equipment.

Structure

JIS rack mounting type
External size: 480(W) x 299(H) x 450(D)mm (Excluding protrusions)
Mass: 20kg or less

Specification

Common	Power supply voltage	DC+48V±15% or less
	Power consumption	10W or less (Not include PA)
	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.)
Use conditions		Continuous use
Distributor	I/O impedance	50Ω/TNC type (Unbalance)
	Number	3
Synthetic equipments	I/O impedance	50Ω/N type (Unbalance)
	Number	3
	Maximum input level	5W

Performance

ControlItem	SquelchInput	It judge broadcasting stop according to squelch signal of the first method and the second method and controlees output off. When all squelch signals of the first method and the second method are generated, the output stop is done.
	Squelch Input connector	Non-voltage contact input , Contact rating DC24V, 0.1A or lessD-sub 9S M2.6 type
PA examination ON (compulsion start)		Even when the output of PA has been stopped by the broadcasting stop, PA can be started by the SW or external examination ON control. The switch lights while compulsion start.
Alarm Monitoring Item	PA ALM (3 methods)	By OR-detecting abnormal of each PA, warning is output even by one, and LED lights.
	Broadcasting stop	When it judges the broadcasting stop and stops the output of PA, warning is output and LED lights.
	Alarm interface (With PA2S37)	Non-voltage contact output, contact rating DC24V, 0.1A or less(ALARM) D-sub 9S M2.6 type
Distributor	Frequency Characteristic	1.0dBp-p or less (Within specified band)
		0.5dBp-p or less (Within specified cannel)
	Insertion loss	6.5dB or less
	I/O VSWR	1.2 or less
	Uniting loss between terminals	20dB or more
Synthetic equipments	Frequency Characteristic	1.0dBp-p or less (Within specified band)
		0.5dBp-p or less (Within specified cannel)
	Insertion loss	7dB or less
	I/O VSWR	1.2 or less
	Uniting loss between terminals	20dB or more

Function

This equipment is a power amplifier of the composite method in the relay station of ISDB-T Digital Terrestrial Broadcasting, and a distributor, a synthetic equipment, and the controller are mounted.
3 PA (PA2S37) is mounted on this equipment, and it is used as MCPA of a parallel-synthetic method.
The basic function provides with the watch and the control operation in accordance with "Transmission equipment commonness specifications for the digital terrestrial broadcasting" (Orange Book) as well as 5W SCPA, and is controlled by this equipment.
The broadcasting stop is judged according to the squelch signal from a basic device and the PA output is controlled. SW of PA examination ON (compulsion start) has adhered for the examination during broadcasting stopping.
Moreover, it OR-detects abnormal of each PA. When abnormal is detected, whether PA is abnormal displayed by the LED and outputted by the point of contact and the state is maintained.
Steady operation is possible, because the fan for the forced air cooling that can be exchanged is installed at front side, and the inside design is considered the ventilation efficiency.