Repeater Compositions / ISDB-T Digital TV Broadcasting Relay Systems

Product code: 3275D

   

Outline

This equipment is a standard signal generation device that uses the oscillator of 10MHz using the resonant frequency of the rubidium atom, and generates a sine wave synchronous signal.
The power supply unit, the rubidium oscillation unit and the switch units in two methods, are mounted by one case, and when one method is at the failure, the switch to another method is enabled by automatic or manual.
The signal is generated synchronizing with each other, and two methods can be switched in seamless.

Composition

Name of articles	Pet name	Number	Remarks
Sub-rack	RB2SSR	1	[Single code: 3275D] *Fan Unit (3276D) Attachment
Power supply unit	RB2SPS	2	[Single code: 3275PD]
Rubidium oscillation unit	RB2SRB	2	[Single code: 3275RD]
Switch unit	RB2SSW	2	[Single code: 3275SD]

Structure

External size:
480(W) x 249(H) x 400(D)mm (Including Fan unit. Excluding protrusions.)
The power supply unit, the rubidium oscillation unit and the switch units in two methods, are built into a sub-rack to which JIS can be rack mounted. Fan unit is attached to a sub-rack.
Mass: Main body 24kg or less ／ Fan unit 5kg or less

Specification

Output (10MHz Standard signal)	Level	0dBm
	Number	2 / RB2SSW 1unit
	Impedance	50Ω
	Connector	BNC-J
Output (1PPS signal)	Level	TTL level(VOH2.4V or more, VOL0.4V or less)
	Number	2 / RB2SSW 1unit
	Impedance	50Ω
	Connector	BNC-J
1PPS Input Positive polarity pulse	Interface	CMOS
	Number	1 / RB2SSW 1unit
	Raising pulse width	10μS or more, 500mS or less
	Synchronous standard	Raising edge
	Impedance	100kΩ
	Connector	BNC type R
Control/Monitor Input/Output	Information	Selection signal, alarm, and switch information
	Output interface	No polarity photo-Moseley output
	Number	2 (RB2SSR [METHOD-1] [METHOD-2])
	Connector	D-sub 15S
Cooling method		Air cooling without blower (However, it is a forced air cooling at the ambient temperature 40°C or more with fan unit.)
Power supply	Voltage	DC 48V±15%
	Power consumption	Above 220W (At start)Above 140W (When regular)※Including Fan unit
	Use conditions	Continuous use
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.)

Performance

10MHz signal output
Frequency precision	±0.1ppb	(1×10－10) or less
Time precision	0.05ppb/month	(5×10－11) or less
	0.05ppb/second	(5×10－11) or less
Temperature stability	0.15ppb	(1.5×10－10) or less (25°C±25°C)
Power supply stability	0.1ppb	(1×10－10) or less (DC+48V±15%)
Rising characteristic	0.1ppb	(1×10－10) or less(at 20 minutes after power on)
SW characteristic	Amplitude changes	2dB or less (under the condition of MASTER/SLAVE)
	Phase changes	2degree or less (under the condition of MASTER/SLAVE)
	SW time	Above 50μs
1PPS(1Hz) signal output
Wave form	Symmetry square wave
Frequency precision	As same as 10MHz signal output

Accessory

Fan unit (3276D) is attached to sub-rack (RB2SSR).