ATU-100 Automatic Antenna Tuner (Factory Original)

ATU-100 Automatic Antenna Tuner

The ATU-100 Automatic Antenna Tuner is a compact microprocessor-controlled antenna matching unit designed for amateur radio HF transceivers. Utilizing an automatic L-network tuning system with high-speed relay switching, it quickly matches a wide range of antennas across the HF spectrum, improving power transfer and reducing SWR for efficient station operation. Its compact design and low power consumption make it ideal for both fixed and portable radio installations.

Key Features

• Automatic HF antenna tuner with microcontroller-based operation
• Designed around the popular N7DDC ATU-100 architecture
• Automatic impedance matching across HF amateur bands
• Supports transmit power levels up to 100 Watts PEP
• Fast relay-switched L-network tuning system
• Capable of matching a wide range of antenna impedances
• High-speed tuning process with stored memory settings
• Automatic recall of previously tuned frequencies
• 128-position memory storage for rapid retuning
• Integrated SWR and power measurement display
• OLED display for operating status and tuning information
• Compact enclosure suitable for portable and fixed stations
• Low insertion loss design
• Compatible with most HF amateur radio transceivers
• Supports QRP through 100W operating levels
• Wide impedance matching capability
• Automatic and manual tuning functions
• Built-in directional coupler for SWR monitoring
• High-quality relay network for reliable operation
• Low standby power consumption
• Suitable for dipoles, verticals, end-fed antennas, and portable antennas
• Ideal for portable HF, POTA, SOTA, and field operation
• Compact lightweight design for travel use
• User-friendly interface with simple controls
• Improves antenna matching efficiency across multiple bands

Typical Uses

• HF amateur radio stations
• Portable HF operation
• POTA and SOTA activations
• End-fed and random wire antennas
• Multi-band antenna matching
• Emergency communication deployments
• Field Day and portable contest stations

In the Box

• ATU-100 Automatic Antenna Tuner
• Integrated OLED display
• DC power cable (where supplied)
• User documentation