Tuner AAT-100

AAT 100 small


Automatic Antenna Tuner AAT-100 was designed for SunSDR2 DX transceivers. Allowed SWR level is up to 5 (resistance level in a range from 15 up to 300 Ohm).

1. Press the Tune button in the ExpertSDR2 to tune the tuner.
- Minimal output power for tuning is 5W
- Recommended output power for tuning is 15W
- Maximum output power for tuning is 20W
2. ExpertSDR2 saves tuner's states with 50 kHz step e.g. in sections 7.0-7.05; 7.05-7.1; 7.1-7.15, etc.
3. Tuner measures SWR-level and this value may differ from what you see in the software. The correct value is the one you see in the pop-up window after the tuner is tuned. In ExpertSDR3 we'll sync them so that the correct value is displayed.
4. SWR 1.0...1.2 are considered normal, reaching this value tuner stops tuning.
5. In the ExpertSDR3 tuner status will be displayed in the software status bar e.g. ATU: Tuning; ATU: Tuned; ATU: Failed to tune.
1. Tuner should be used with full-sized antennas with SWR up to 1:5.
2. Tuner can be used with short antennas with SWR higher than 1:5 with caution and output power not higher than 30W.
3. Tuning elements (capacitors, inductors, relays, SWR-sensor) are not covered by warranty.
Transceivers with serial numbers EED06421900001...EED06421900100 and EED06511900101...EED06511900200 might require a voltage stability upgrade to use the AAT-100. Here is the link to the instruction.


Input impedance

50 Ohm

Operating temperature


Operating frequency range

1.8...30 MHz

Max input power

~120 W

Control cable length

3 m

Antenna cable length

3 m

Articles and Reviews


Review in Radioamater, by Pavel Misek, OK7PM (April 2021)
In Czech