Ultra-Low-Noise Isolated USB Power Supply 5V/3A 12/24V DC PowerPole

Key Features

• Ultra-Low Ripple 5 V Output: Maintains ripple under 15 mV peak-to-peak under demanding load conditions.
• PowerPole DC Input: Accepts 12–24 V input for station-standard DC distribution.
• High Current USB Power: 5 V at up to 3 A for modern USB-powered RF devices.
• Enhanced RF Isolation Stage: Added EMI filter improves conducted-noise rejection between input wiring and the 5 V rail.
• RF-Optimized Design: Radiated emissions measured below 10 dBuV peak in the 1–500 MHz range.

Recommended Use Cases

Ideal for powering noise-sensitive USB loads such as:

• VHF/UHF hotspots (SA818-based, MMDVM-class systems, etc.)
• USB SDR receivers and front-ends
• Raspberry Pi setups powered via 5 V input (where a quieter 5 V rail improves RF behavior)
• USB-powered RF accessories (filters, LNA modules with USB power, small controllers)

Performance Testing

Measurements were taken during boot and under load to simulate worst-case current draw and RF-noise behavior.

Ripple & Noise

• Ripple consistently below 15 mVpp.

Radiated Emissions (1 MHz – 500 MHz)

• Measured using a compact TEM cell setup with a 50-ohm load.
• Baseline taken with a lab-grade 5 V supply.
• Compared against the USB power supply feeding an RF-representative load setup.

Technical Specifications

• Input Voltage: 12–24 V DC (PowerPole).
• Output Voltage: 5 V DC (USB power).
• Maximum Output Current: 3 A.
• Ripple: <15 mVpp (measured under load).
• Conducted/RF Noise Suppression: Additional EMI isolation filtering.
• Radiated Emissions: <10 dBuV peak (1–500 MHz, test setup as described).
• PCB Technology: ENIG finish for durability and conductivity.
• Compliance: RoHS compliant.

Measurement Results

Ripple

Radiated Emissions (1–500 MHz)

Test Setup with RF.Guru Ultra-Low-Noise USB Supply

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