Item Description

The LDG Z-11 Pro II Automatic Antenna Tuner is a compact, lightweight HF antenna tuning unit designed for amateur radio operators who need reliable automatic matching in base, mobile, or portable operation.

Ideal for both QRP and standard HF transceivers, this tuner provides fast automatic impedance matching across the entire HF spectrum and 6 metres, ensuring efficient antenna performance across multiple bands.

With LDG’s advanced memory tuning system, the Z-11 Pro II learns frequently used settings and stores them for near-instant recall, significantly reducing tuning time during band changes.

Designed for extremely low power consumption, it is especially suitable for portable and battery-powered field operations, including SOTA, portable HF, and mobile installations.

Manufactured by LDG Electronics, this unit is known for reliability, efficiency, and excellent long-term performance.

Key Features

• Automatic HF antenna tuner (base, mobile, portable use)
• Compact and lightweight design for field operation
• Handles up to 125W SSB/CW (100W on 6m)
• Advanced memory tuning system (learns frequently used frequencies)
• Approximately 2,000+ memory locations with intelligent recall system
• Auto and semi-auto tuning modes
• Extremely low standby current for battery operation
• Optional internal AA battery operation (8x AA cells)
• Supports coax-fed and wire antennas

Technical Specifications

• Frequency Range: 1.8 – 54 MHz
• Power Handling:
  • 0.1 – 125W SSB/CW
  • 100W on 6m band
• Impedance Matching Range:
  • 6 – 1000 ohms (HF)
  • 16 – 150 ohms (6m)
  • Up to 4000 ohms with optional 4:1 balun
• Memory System: 2,000+ intelligent frequency memories (3D memory system)
• Tuning Time: 0.1 – 6 seconds full cycle
• Power Supply: 11 – 16V DC (up to 300mA during tuning)
• Standby Current: ~25µA ultra-low drain
• Battery Option: 8x AA internal battery holder

Compatible Antennas

• Dipole antennas
• Vertical antennas
• Inverted V antennas
• Beam antennas
• Mobile HF whips
• Long wire antennas (with balun)
• Portable field antennas

Ideal For

• Amateur radio HF operators
• Portable / SOTA / field operations
• Mobile HF installations
• QRP enthusiasts
• Base station setups
• Multi-band antenna systems

Benefits

• Extremely low power draw for portable operation
• Fast automatic tuning with smart memory recall
• Lightweight and highly portable design
• Ideal for battery-powered field use
• Reduces tuning time after initial use
• Reliable HF performance across all amateur bands