Link: ERC Version 4 USB - the most popular rotator controller

USB rotator control right from your PC screen with ERC Version 4 USB.  Point and click with the mouse with either supplied ERC software or interfaced via many popular transceiver control and logging programs. 

ERC Version 4 USB feature list:

  • USB connected point-and-click control of almost any ham rotator, HyGain/CDE, all Yaesu, Create, Daiwa, ProSisTel - see the complete supported rotator list at the bottom of this page.
  • Software included and/or use with popular logging/control programs
  • Programmable stops, offsets, overlap support, speed function
  • Windows XP/Vista/7/8/10 32/64 bit
  • PC board mounts inside rotator control box
  • USB cable included
  • $99 as a kit, $129 assembled


Included with ERC Version 4 USB:

  • Kit includes all components to build the ERC Version 4 USB and to install it inside rotor controller

  • USB cable and 12VDC power cable

  • Instructions how to build and use ERC Version 4 USB.

  • Installation guide for more than 90 rotators.  

  • Software Service Tool (Windows XP/Vista/7/8/10 32 and 64 bit) for configuration and calibration.

  • Rotor Control Software (Windows XP/Vista/7/8/10 32 and 64 bit).


  • PC board size : 3.15 x 2.4 inches (80 x 61 mm)

  • DC supply voltage : 11-15 VDC, max 110mA, protected against wrong polarization

  • Operating temperature : 0 to 70° C

  • Software driven calibration

  • Full support for rotators with overlap up to 180°

  • Extended calibration every 30° to compensate non-linearities of the rotator feedback voltage

  • Security stop, if the rotator does not move

  • Relay circuits:

    • CW/CCW : each 2xON/OFF (DPDT) max 50VAC/3A or 30VDC/2.5A

    • AUX : 1xON (SPST) max. 250VAC at 3A

  • Communication port:   USB (FTDI-chip), Baud rate configurable 4800-9600-19200-38400

  • ERC is compatible to a subset of the following protocols:

    • Hygain DCU-1 with extension for position feedback

    • Yaesu GS232A

    • Yaesu GS232B

How it works:  the completed PC board is installed inside the rotor control box.  A template for hole punching on the rear of the control box is included with instruction set.  Connect 12VDC to the ERC v4 USB unit with the included power cable and the board to your shack computer with the included USB cable.  Install the software calibration tool to automatically calibrate and configure your rotator.  Open the ERC software, and start turning the rotator!  Stand-alone software use, or ERC v4 USB can be interfaced with many popular logging and control programs.


ERC Version 4 USB board mounted inside a Yaesu G450A control box



    Standard screen graphic for ERC control software.  To turn the rotator, mouse over any spot on the circular azimuth indicator, click, and the rotator will start turning.  For small adjustments, clicking on the << or >> button moves the rotator the same way physically pushing the buttons on the front of the rotator control box would.  A specific target point can be typed into the box next to the GO 1 button.  In the example shown, 338 degrees is the target - click on GO 1 and the rotator will move to 338.  Rotation can be canceled at any time by clicking STOP 1.  A parking position for the rotator can be programmed into the PARK 1 box.  Very easy to use!

    Compare ERC Version 4 USB with Idiom Press Rotor-EZ for Hy-Gain rotators: 

    ERC Version 4 USB

    Idiom Press Rotor-EZ

    Interfaces to popular rig control and logging programs



    Direct USB control



    Calibration software included



    Usable with Hy-Gain/CDE, all Yaesu, Create, Daiwa, Emotator, ProSisTel rotators

    All Brands Supported

    Only Hy-Gain/CDE

    Kit Price



    Assembled Price




    In addition to ERC Version 4, we also have specific control interfaces ERC Mini DX and ERC Mini SDX  for -DXA and -SDX Yaesu rotators, described elsewhere on our website as assembled units.  Priced at $109 and $125 vs. $142.95 and $164.95 from our competition.


ERC Version 4 USB KIT

ERC Version 4 USB KIT with components, PC board, cables, complete build and installation instructions, CD with calibration and operation software. 


ERC Version 4 USB FACTORY ASSEMBLED with built PC board, cables, complete installation instructions, CD with calibration and operation software.