Welcome to StepperTune

StepperTune is a way to control an Antenna Tuner remotely via a single Cat 5 cable using two Stepper Motors.

The front panel of a StepperTune unit.

StepperTune Features

  • Designed to control two stepper motors for controlling a remotely located antenna tuner.
  • May remotely control tuning capacitor for magnetic loop.
  • Control cable may be a Cat 5 cable up to 200 feet while using a 12 volt power supply.
  • Cable lengths greater than 200 feet may be realized using a supply voltage up to 24 volts DC.
  • Eight memory locations for both steppers.
  • Auto band memories for auto-band change from Icom transceivers (other transceivers may be implemented with a band decoder module upon request).
  • Automatic antenna tuning capable with external specified directional coupler connected.
  • Stepper motor current control and stepper motor current displayed. Capable of up to 2.5 amps of stepper drive current.
  • Stepper over-current/over temp shutdown protection.
  • “Jog mode” to easily fine tune either stepper motor.
  • Stepper motor speed easily programmed.

Ports of the reverse side of a StepperTune unit.

A StepperTune unit with two motors attached.


The following is a demonstration of StepperTune in action.


StepperTune in the Field

Ron Douglass’ (NI7J of Scorpion Antennas) tuner.

New ATU on Acrylic.

Ron Douglass-NI7J of Scorpion Antennas.

K7EMF Ranch- ATU.

Ron Douglass’ (NI7J of Scorpion Antennas) tuner with the tower in the background.

Terms of Purchase

Purchase at www.trueladderline.com. Contact us for more information.

Find Out More

Contact us or place an order at www.trueladderline.com.