LDG AT-600ProII Automatic Antenna Tuner 600W, 1.8-54MHz, 4000 Memories, Dual Antenna

LDG AT-600ProII Automatic Antenna Tuner

The LDG AT 600 ProII is a general-purpose automatic antenna tuner designed for use with mid-size amplifiers, handling up to 600W SSB/CW output across 1.8–54MHz. It operates automatically, beginning a tuning cycle whenever SWR exceeds a preset limit — to protect its circuitry, tuning is performed at exciter power only (bypass or standby your amplifier during the tune cycle). A large bar-graph wattmeter displays forward and reverse power alongside SWR, and two antenna output connectors with 2,000 memories each allow near-instant retuning on previously used frequencies.

Key Features

• 600W SSB/CW rated — suitable for use with mid-size amplifiers
• Covers 1.8–54MHz (160m–6m) continuously
• 4,000 memories (2,000 per antenna) for near-instant band changing
• Two antenna output connectors with independent memory banks
• Bar-graph wattmeter: forward power, reverse power, and SWR
• Tunes 6–800Ω loads (16–150Ω on 6m) — Yagis, dipoles, inverted-Vs, slopers, and coax-fed antennas
• Longwires or ladder-line fed antennas require an external balun (not included)
• Optional M-600 4.5" analog meter available separately
• Includes DC power cable

Technical Specifications

• Frequency Range: 1.8–54MHz
• Power Rating: 600W SSB/CW (tune at exciter power only)
• Load Range: 6–800Ω (16–150Ω on 6m)
• Memories: 4,000 (2,000 per antenna output)
• Antenna Outputs: 2
• Tuning Time: 0.5–6 seconds (full) / 0.1 seconds (memory)
• Power Requirements: 11–16V DC, 750mA max during tuning
• Dimensions (D × W × H): 267 × 216 × 64mm