Repeater Compositions / ISDB-T Digital TV Broadcasting Relay Systems

Product code: 6556A

Outline

This is the meter panel for the relay station of Digital Terrestrial Broadcasting. The input corresponds to a single channel.
In addition to the display of transmitting power, the output levels, the power-supply voltage, and FET current of the power amplifier in two methods is displayed.

Structure

JIS rack mounting type
External size: 480(W) x 99(H) x 450(D)mm (Excluding protrusions)
Mass: 4.5kg or less

Specification

(Input level is a mean value.)

Input frequency	Specified UHF channel (single channel)
Input level	-30dB against Specified PA output level
Input impedance	50Ω/TNC type (Unbalance)
Display (selected by SW)	Ratings transmitting power(%), The output levels, the power-supply voltage, and FET current input from PA1 and PA2 are displayed by (%), (V) or (A).(Meter full scale 300mV/1.5kΩ)
Power supply voltage	DC+48V±15% or less (when input at two methods)
Power consumption	3W 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.)
Use conditions	Continuous use

Performance

Transmitting power failure (ALARM)		Red LED lights when It decreases to the ratings transmitting power by 3dB, and abnormality is output by the point of contact.
Transmitting power abnormal (Alert)		It is possible to add it by the option.
Detected Output		+5V is output at the ratings transmitting power.
Interface	Transmitting power detection	Non-voltage contact outputContact rating DC24V, 0.1A or less (ALARM)DC voltage (detected output) D-sub 15S M2.6 type
	PA display (PA DET1, PA DET2)	DC voltage (PA output, PA power supply voltage, PA FET current) D-sub 9P M2.6 type

Function

This equipment displays the meter of transmitting power, and can input each meter output of the output level, the input power-supply voltage, and the FET current from SCPA up to two methods or less at the relay station adapting SCPA of Digital Terrestrial Broadcasting. By selecting with meter switch on the panel, of each is displayed in the meter.
About transmitting power display, because it has the circuit internally, the level can be observed by inputting the signal from the monitor output of the output filter, the branch output of SCPA and etc. to this equipment.
When It decreases to the ratings transmitting power by 3dB, Red LED lights , and abnormality is output by the point of contact. It is also possible to mount another one method of abnormal transmitting power (option), and to use it as a caution output of the level decrease.