LDG Z-100 Plus Automatic Antenna Tuner 1.8–54 MHz, 125W

The LDG Z-100 Plus is a compact, energy-efficient automatic HF antenna tuner covering 1.8–54 MHz (including MARS frequencies). It handles 0.1–125W SSB/CW/digital, making it equally capable with QRP rigs and full-power HF stations.

LDG's latching relay design means near-zero current draw in standby — only ~200mA during active tuning. The 2,000-frequency memory system recalls previously tuned settings almost instantly, so band changes after the first tune are seamless. SO-239 input and output connectors, 7–18V DC supply, and a 3ft DC cable included.

Supports coax-fed antennas directly; wire antennas including G5RV, OCF dipoles, and long wire with an appropriate balun.

Key Features

• Frequency range: 1.8–54 MHz (continuous, incl. MARS)
• Power: 0.1–125W SSB/CW/digital
• Impedance matching: 6–800Ω (HF), 16–150Ω (6m)
• 2,000 frequency-based memories with near-instant recall
• Latching relay system — near-zero standby current draw
• ~200mA current draw during tuning only
• SO-239 input/output connectors
• Power supply: 7–18V DC (3ft DC cable included)
• Supports coax-fed and wire antennas

Ideal For

• QRP and portable field operators
• SOTA, POTA, and field day use
• Mobile HF installations
• Multi-band base station setups