1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your Astron RS-35M-AP Desktop 13.8VDC Linear Power Supply. This unit is designed to deliver stable and regulated DC power for various electronic applications, particularly in amateur radio and communication setups. Please read this manual thoroughly before installation and use to ensure proper function and longevity of the product.
Image 1.1: Front view of the Astron RS-35M-AP Desktop Linear Power Supply, showing the voltage and amperage meters, and Anderson Power Pole connectors.
2. Safety Information
Always observe the following safety precautions to prevent injury or damage to the power supply and connected equipment:
- Ensure the power supply is connected to a properly grounded AC outlet (105-125VAC).
- Do not expose the unit to rain, moisture, or excessive humidity.
- Avoid operating the unit in direct sunlight or near heat sources.
- Do not block ventilation openings. Ensure adequate airflow around the unit.
- Never open the power supply casing. There are no user-serviceable parts inside, and dangerous voltages are present. Refer all servicing to qualified personnel.
- Disconnect the AC power cord before making or changing any output connections.
- Do not overload the power supply beyond its specified continuous or peak current ratings.
- In case of smoke, unusual odors, or abnormal operation, immediately disconnect the power supply from the AC outlet and all connected devices.
3. Product Features
The Astron RS-35M-AP Linear Power Supply incorporates several design features for reliable performance:
- Solid State Electronically Regulated: Provides stable and consistent output voltage.
- Fold Back Current Limiting: Protects the power supply from excessive current draw and continuous shorted output conditions.
- Crowbar Over Voltage Protection: Safeguards connected equipment from potential over-voltage conditions.
- Low Ripple: Maintains regulation and low ripple (less than 5mV peak to peak) even at full load and low line input voltage.
- Heavy Duty Heat Sink: Ensures efficient heat dissipation without the need for a cooling fan.
- Integrated Meters: Features separate analog meters for displaying output voltage and amperage.
- Versatile Power Terminals: Equipped with 1/4"-20 screw type terminals and Anderson Power Pole connectors for flexible connectivity.
4. Setup
Follow these steps to set up your Astron RS-35M-AP power supply:
- Unpacking: Carefully remove the power supply from its packaging. Inspect the unit for any signs of shipping damage. Report any damage to your dealer immediately.
- Placement: Place the power supply on a stable, level surface. Ensure there is adequate clearance around the unit for proper ventilation, especially around the heat sink fins. Avoid placing it near sources of heat or in enclosed spaces.
- AC Power Connection: Connect the supplied three-conductor power cord to the AC input receptacle on the rear of the power supply. Plug the other end into a standard 105-125VAC, 50/60Hz grounded wall outlet.
- DC Output Connection:
- Screw Terminals: For high current applications, use the 1/4"-20 screw type terminals. Ensure proper polarity: connect the positive (+) lead of your device to the red terminal and the negative (-) lead to the black terminal. Tighten securely.
- Anderson Power Poles: For convenient, quick-connect applications, use the Anderson Power Pole connectors on the front panel. Ensure your device's connectors are correctly polarized before insertion.
Important: Always ensure the power supply is OFF and disconnected from AC power before connecting or disconnecting any DC loads.
5. Operating Instructions
Operating the Astron RS-35M-AP is straightforward:
- Power On: After all connections are made, switch the power supply ON using the front panel power switch. The meters will illuminate, and the voltage meter will display the output voltage (approximately 13.8VDC).
- Monitoring Output:
- The Voltage Meter indicates the DC output voltage.
- The Amperage Meter indicates the current being drawn by the connected load.
- Load Connection: Connect your DC-powered device to the appropriate output terminals. Observe the amperage meter to ensure the current draw does not exceed the continuous rating of 25 Amps (35 Amps peak).
- Internal Voltage Adjustment: The output voltage is internally adjustable from 11-15VDC. This adjustment should only be performed by qualified personnel using a small screwdriver through the designated access point, typically on the rear or bottom of the unit. Refer to the service manual for precise instructions if adjustment is required.
- Power Off: When finished, disconnect your device, then switch the power supply OFF.
6. Maintenance
The Astron RS-35M-AP is designed for minimal maintenance. Follow these guidelines to ensure optimal performance:
- Cleaning: Periodically wipe the exterior of the unit with a soft, dry cloth. Do not use liquid cleaners or solvents, as they may damage the finish or internal components.
- Ventilation: Ensure that the heat sink fins and any ventilation openings remain clear of dust and debris. Blocked ventilation can lead to overheating and reduced performance.
- Inspection: Regularly inspect the AC power cord and DC output cables for any signs of damage, fraying, or loose connections. Replace damaged cables immediately.
- No User Serviceable Parts: The unit contains no user-serviceable parts. Do not attempt to open or repair the power supply yourself. Unauthorized opening will void the warranty.
7. Troubleshooting
If you encounter issues with your power supply, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No output voltage, meters off. | No AC power; Power switch off; Blown internal fuse. | Check AC power cord connection and wall outlet. Ensure power switch is ON. If fuse is suspected, contact qualified service personnel. |
| Low or fluctuating output voltage. | Overload condition; Loose DC connections; Faulty load device. | Reduce load current. Check and tighten DC output connections. Test with a different load device. |
| Power supply shuts down. | Overload protection activated; Over-temperature. | Disconnect load, turn off power supply, wait a few minutes, then restart. Ensure adequate ventilation. Reduce load. |
| Humming or excessive noise. | Normal transformer hum (linear supplies); Loose internal components. | A slight hum is normal for linear power supplies. If noise is excessive or new, discontinue use and contact service. |
If the problem persists after attempting these solutions, contact Astron customer support or a qualified service technician.
8. Specifications
Technical specifications for the Astron RS-35M-AP Desktop Linear Power Supply:
- Model: RS-35M-AP
- Input Voltage: 105-125VAC
- Output Voltage: 13.8VDC ±0.05 volts (Internally adjustable 11-15VDC)
- Continuous Duty Current: 25 Amps
- Intermittent Communication Service (ICS) Current: 35 Amps
- Ripple: Less than 5mV Peak to Peak (full load and low line)
- Load Regulation: 0.08% from 0 to Full Continuous Load
- Efficiency: 77%
- Operating Temperature: -10 to 55°C
- Power Terminals: 1/4"-20 Screw Type and Anderson Power Poles
- Cooling: Heavy Duty Heat Sink (Fan Cooled: No)
- Meters: Separate Voltage and Amperage Meters
- Dimensions: Approximately 11 x 11 x 5 inches
- Weight: Approximately 27 pounds
- Color: Black
- Material: Alloy Steel, Metal
9. Warranty and Support
Astron products are manufactured to high standards. For specific warranty information, please refer to the warranty card included with your product or visit the official Astron website. Keep your purchase receipt as proof of purchase for warranty claims.
For technical support or service inquiries, please contact your authorized Astron dealer or Astron customer service directly. Do not attempt to repair the unit yourself, as this may void the warranty and pose a safety risk.
Contact Information: Please refer to the packaging or Astron's official website for the most current contact details.
