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ACU(Automatic Control Unit) is equipment for maintaining broadcasting service by controlling error occurrence by observing and analyzing the status of digital broadcasting system.
Indoor-type broadcasting relay system is generally composed of 1 set of Exciter for falsification and demodulation and HPA(High Power Amplifier), BPF(Band Pass Filter) and dualized as 2 sets for reliability. ACU reports to control department after taking suitable action to service for normal status by checking the input, output and condition of each set.
ACU determines the errored set by referring the internal state and input/output generated from each set. Then it reports the action results to the control station after the services are normally processed through the appropriate measures.
- Operation Mode
- Local - Manual/Auto
- Remote - Manual/Auto
- Control Function
- TX ON & OFF
- Fault reset
- Auto change-over (Active Standby)
- TX-A/B antenna selection
- Monitoring and Display Function (Indication)
- Receiving status (Normal/Abnormal) indication
- Total fault
- TX alarm
- TX ON & OFF indication
- Auto/Manual, Local/Remote
- TX PS NORMAL
- Auto change-over LED
- TX-A/B antenna use
- Alarm Function
- Total fault
- Exciter A/B fault
- TR PA fault
- TX output reflect fault
- TR PA temperature fault
- TX output low(80%) / high(120%) fault
- PA power supply fault
- TX Quality Monitoring Function
- Output power/reflect power (uncertainty : 4% or less)
- Transmission SNR
The Results of measurement is actual data drawn with RFA300A, and shows considerable improvement of distorted amplitude and status characteristic even on naked eyes.
| Item | Specifications | Remarks |
|---|---|---|
| Equipment Shape | 19inch Rack Type | |
| Height | 3RU or less | |
| Depth | 400mm or less | |
| Weight | 5Kg or less | |
| LCD Panel and Key Function | LCD | Front arrangement |
| Signal Diagram | KEY+LED | Front arrangement |
| Control Key | TX ON, TX OFF, RESET, EXCITER CHANGE, AUTO, MANUAL, LOCAL, REMOTE |
Front arrangement |
| Fault LED | TOTAL, EXC-A, EXC-B, PA, P/S, VSWR | Front arrangement |
| Exciter #1,#2 and Interface | RS-232C (D-SUB 9Pin) | Rear arrangement |
| HPA #1,#2 Interface | RS-232C (D-SUB 9Pin) | Rear arrangement |
| Switch Module Interface | RS-232C (D-SUB 9Pin) | Rear arrangement |
| PSU #1, #2 Interface | RS-232C (D-SUB 9Pin) | Rear arrangement |
| Power Monitor Interface | RS-232C (D-SUB 9Pin) | Rear arrangement |
| Communication with Upper Controller | RS-485 (D-Sub 9Pin) | Rear arrangement |
