All enthusiasts of QRP field operations typically seek the smallest possible technical solutions to keep their equipment as mobile as possible. Field work means operating with temporary antenna systems, which usually require tuning. The ATU KT-005 from KRAIT Technologies directly responds to these needs, offering the smallest solution of its kind in the world. 

Within a compact enclosure measuring just 54 x 55 x 24 mm, it houses an advanced automatic antenna tuner capable of matching antennas in the 1.8 MHz to 30 MHz range, with power levels up to 5 W.

Note: Assembly of the device is not intended for beginners. Due to the high level of miniaturization, at least intermediate soldering experience and appropriate equipment are required.

• The world’s smallest QRP Automatic Antenna Tuner (ATU) available on the market 

• The ATU works with any type of radio and in any mode (CW, WSPR, SSB, PSK, FT-8, and others) 

• Auto power-off function for zero current consumption after tuning 

• High grade (Fujitsu) reliable mechanical latch-type relays 

• Durable, lightweight aluminum housing: black anodized with laser-engraved symbols 

• SMA female connectors for maximum miniaturization 

• LED indicators for monitoring RF power level, SWR and battery voltage 

• Low-battery detection when operating on a 9 V battery 

• Two control buttons for easy operation 

• Reverse polarity protection 

• Matching impedance range: 5 ~ 500 R to 50 R* 

• Matching accuracy (VSWR): 1.5:1 or less** 

• Network type: L-network with series L and shunt C 

• C shunt is switched between the TRX and ANT sides 

• 32,768 matching states enabled by 15 internal relays 

• Minimum operating power: 0.5 W (for tuning) 

• Maximum operating power: 5.0 W (in CW mode) 

• Frequency range: 1.8–30 MHz 

• Input impedance: 50 R 

• Tuning time: less 7 seconds (maximum 15 seconds) 

• Dimensions: 54x55x24 mm; 2.13x2.17x0.94 in (WxHxD)*** 

• Weight: 0.107 kg (3.77 oz) 

• IP (Ingress Protection) rating: 20 

• RF connector type: SMA female (50 R) 

• DC input: 5.5/2.1 male (positive polarity) 

• Power supply requirement: 8─18 VDC 

• No built-in battery (suitable for air transport) 

• Operating temperature: -25°C to +60°C; -13°F to +140°F 

*) when operating on the 160 m or 80 m bands, the matching range is smaller 

**) except for half-wavelength or multiple-half-wavelength antennas 

***) measured without connectors 

Orders are shipped within 3 business days.

Please note: receipts or invoices are not provied.