Advantages:
1. Has been authorized by the author N7DDC
2. Follow the author's design, C1-C7 adopts 500V Elec Fish Mica Capacitors which are stable and reliable
3. Input power supply solid capacitor filtering, stable, safe and long life
4. The button on the front panel can be used to set antenna tuner's automatic mode

This button can be used to set antenna tuner's automatic mode. Steps:
1. Turn it on and long press TUNE button at the same time to enter mode adjustment.
2. Release TUNE button, and switch automatic mode by pressing TUNE button.
3. After the adjustment is completed, shut down and restart through the POWER switch on the back.

Features:
- SMT Patch Welding: High reliability and strong vibration resistance. SMT patch soldering can help you get rid of soldering a large number of patches manually.
- Imported Magnetic Ring Inductance Components: Adopt T68-2 imported magnetic ring, stable and reliable performance.
- Universal Double M Female Flange: Improve durability while ensuring stable connection. Newly added rocker switch, easy to control power on and off state, no longer need to repeatedly plug and unplug power supply.
- Specially Designed Support Bracket: Simple and firm support, easy to put PCB into the box for fixing.
- Front panel's button can be used to set antenna tuner's automatic mode.

Specifications:
- Input voltage range: 10-15V DC
- Maximum working current: 400mA
- Maximum working power: 100W
- Maximum measurement power: 150W
- Auto tuning trigger power: 5W
- Minimum measurement power: 1W
- Power measurement error: 20%
- Maximum inductance: 8.53uH
- Minimum inductance: 0.05uH
- Maximum capacity: 1869pF
- Minimum capacitance: 10pF

Package Included:
- 1 x Set of Automatic Antenna Tuner

Note:
- It is assembled and ready to use.
- Battery is not included.
- The firmware is updated in September, 15th, 2020. Future versions are new versions.
- Due to its design, stable standing wave value cannot be measured when the power is lower than 10W, so the adjustment work cannot be guaranteed. QRP radio users please not purchase the product.

ATU-100 Options:
Access Way:
After turning on power supply, press and hold TUNE button and turn on power switch at the same time. Release the TUNE button after hearing the sound of relay. OPTIONS is displayed on the screen, after a short stay, it automatically enters setting modes.

Description of Each Setting Item:
• Auto Mode (ON/OFF):
If you plan to use the device without additional buttons, you can enable the automatic mode by setting the value to ON. The default value is ON.
• Show Loss (ON/OFF):
Indicating the power delivered to the antenna and efficiency of fider and transmitter when input power is enough for correct SWR measuring.
• Fider Loss (0.0-9.9):
This value uses for counting the power delivered to antenna. The loss value can be found in the reference data for the used cable or you can measure the exact value yourself.
• Auto Delta (1.3-3.0):
The default value is 1.3. That is, when the automatic mode is activated, the tuning process will be triggered when the SWR is above 1.3 and when it changes to (1.3-1).

Attention: ATU-100 Options are only for products purchased after November 17th, 2020.