Now it is time to calibrate your ERC.

Start by checking the calibration of your HyGain Ham-IV controller.

[ ] Press and hold the Brake lever on your controller.

[ ] Press and hold the CCW lever to move the rotator to the stop at the end of the left scale.

[ ] Release the Brake and CCW levers.

[ ] Check that the meter reads exactly 180 on the left hand side.

Full CCW

[ ] Adjust the mechanical screw under the meter to show exactly 180.

[ ] Similarly, use the Brake and CW levers to move to the right hand side of the scale, until it stops.

[ ] Check that the meter reads exactly 180 on the right hand side.

[ ] Adjust the “Calibrate” knob to read exactly 180.

Full CW

[ ] Run the ERC Calibration routine by pressing the “Calibrate 1” Button on the Service Tool.


[ ] Select “Azimuth” when prompted for type of rotator

Azimuth Selection

[ ] Follow the instructions to bring the rotator full CW to the Right side of the meter until it stops.

[ ] Enter 180 for the degrees, when prompted to do so.

Full CW

[ ] Continue following the instructions to bring the rotator full CCW to the left hand side of the meter until it stops.

[ ] Enter 180 degrees, when prompted to do so.

After running this routine, I found that the rotator would be off around 10 to 15 degrees in the center of its movement.

I later did an extended calibration by pressing the “Extended 1” button and following the steps as instructed by the Service Tool. After the extended calibration, my rotator now stops within 2-3 degrees across its entire range.

[ ] Press the Extended 1 Button on the Service Tool

Extended Calibration

Follow the instructions to start on the full CCW position and move the rotator at 30 degree increments each time you press OK.

[ ] 180 degrees full CCW

Step 1

[ ] 210 degrees

Step 2

[ ] Continue at 240, 270, 300, 330, 0, 30, 60, 90, 120 degrees…

Step 11

[ ] Continue at 150 and 180 degrees Full CW

Step 13

[ ] After step 13, your Service Tool will show 13 Steps of Extended Calibration

Extended Calibration Complete

[ ] Save your calibration, by pressing the “Save” Button in case you need to recover it later

[ ] Navigate to the desired storage location, and give the file a name. Then press Save in the dialog box.

Save Dialog

[ ] Close the Service Tool.

[ ] Install the Rotor Control Program by running the setup_RC-M_xx.exe file, and following instructions.

Mine was setup_RC-M_V17.exe, which I already had installed.

[ ] Start the Rotor-Control M program by double clicking its icon.

[ ] Set the Axis to “axis1=AZ | axis2=none”

Setting the Rotor Type

You can check your setup by entering a heading next to the GO 1 button, and clicking that button.

The rotator should move to that position, as long as it was a valid number from 0 to 360.

Alternatively, you can press the mouse anywhere around the outer ring of the compass, and the rotor will move there.

Outer Ring

Next Steps

Now that I have the ERC board working in my HAM-IV rotator controller with my laptop as the computer, my next step is to move operation off of the laptop, and onto a computer more permanent.

With my laptop, I use VNC to connect to it, and get the full screen remotely. That works, but is still a little clumsy for remote operation as I desire.

By moving the USB cable to my HomeAssistant Raspberry PI 4 computer, where I have Nodered running, I should be able to write a Nodered routine to communicate with the ERC board and control the rotator.

Then I can use the Nodered Web Dashboard to control the rotator alongside the controls for my other hamshack automation projects.

Stay tuned for updates on this exciting project!

Part 1 – Construction of the ERC Board

Part 2 – Checkout and Configuration of the ERC Board

Part 3 – Installation of the ERC Board into the HyGain Ham-IV Controller

Part 4 – Calibration and Operation of the ERC Board in the Ham-IV Rotator