GRA-AT330T(C) Motorized HF Screwdriver Antenna
The GRA-AT330T(C) is a motorized HF screwdriver antenna with 3.5–50 MHz coverage, featuring a 12V electric coil system and memory presets for fast, precise tuning in portable and mobile environments.
Engineered for Real-World HF Operation
The GRA-AT330T(C) is a next-generation motorized screwdriver antenna designed for amateur radio operators who demand speed, flexibility, and reliability in the field.
With a built-in 12V motorized coil, users can adjust antenna length directly from the control box, enabling seamless tuning across multiple HF bands without manual repositioning.
Engineered for Real-World HF Operation
The GRA-AT330T(C) is a next-generation motorized screwdriver antenna designed for amateur radio operators who demand speed, flexibility, and reliability in the field.
With a built-in 12V motorized coil, users can adjust antenna length directly from the control box, enabling seamless tuning across multiple HF bands without manual repositioning.
Precision Control with Improved Interface
The second-generation control box enhances usability with:
- HOME function: reset, stop, and return
- Fine and continuous UP/DOWN control
- Automatic movement via double-click
- Clear operation logic for field use
To ensure accuracy, the antenna reference must be reset before operation, maintaining consistent tuning performance.
Built for Portable and Mobile Deployment
Designed for real-world environments:
- Fast deployment for POTA and field operations
- Compact storage for easy transport
- Suitable for vehicle mounting and HOA setups
Rugged and Reliable Construction
- IP68-rated antenna body and connectors
- Durable 5-meter control cable
- Stable performance in outdoor conditions
Flexible Mounting Options
- GRA-AT330T: UHF connector
- GRA-AT330TC: 3/8-24 mount
Compatible with whips, tripods, and various antenna setups.
Important Design Note
The antenna position is controlled by motor running time, not direct frequency measurement.
Tuning accuracy may vary depending on voltage stability, grounding, and installation conditions.
Tuning accuracy may vary depending on voltage stability, grounding, and installation conditions.
Specifications
Frequency Range: 3.5–50 MHz
VSWR: < 2.0
Max Power: 200W SSB
Impedance: 50 Ω
Power Supply: DC 12V
Weight: 1.78 kg
VSWR: < 2.0
Max Power: 200W SSB
Impedance: 50 Ω
Power Supply: DC 12V
Weight: 1.78 kg
Coil Length: 48.5 cm
Whip Length:
Whip Length:
- 7–50 MHz: 18.5–127.5 cm
- 3.5–30 MHz: 24.5–217 cm
Cable Length:
- Power Cable: 1 m
- Control Cable: 5 m
Memory Presets: 10
Waterproof Rating: IP68 (antenna body & connectors)
Waterproof Rating: IP68 (antenna body & connectors)
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