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Green Heron

What's New...

- Green Heron Everyware 2.7.0

- 2.4g Antennas
and cables for
GHE wireless products

     Matrix Coax Switches
     8x2, 12x2, 8x4, 12x4 etc
     Four Stack II



Product Detail

Model: RT-21r
Rotator Controller, Remote
Rotator Controller, Remote
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  • Application
  • Description
  • Features
  • Specifications
  • Software
  • Documentation
RT-21 Remote

The RT-21r cannot directly power a rotator motor.  It is intended to interface with external motor control relays (+24VDC) for custom systems where relay control is desired.  The RT-21r is also capable of interfacing to our RPU for control of large motor systems.

  • Relay Control    
    • 24VDC relay ouput (recommended)
    • configurable for 12V motor relays, or contact closures
  • RPU
    • Speed control/ramp for DC motors up to 2 HP (90/180V), or 28VDC 16A motors (Prop Pitch)
Control relays or the RPU may be separated from the RT-21r by many hundreds of feet and requires only small guage wiring.  Outdoor CAT 5 cable can be used to minimize cable run costs.  Mounting an RPU or relay panel at the tower is common.
RT-21r Description:
The RT-21r is a universal digital rotator controller that may be user configured for many kinds of custom applications.  We can even configure the RT-21r to directly operate a small 115VAC motor like the older Wilson, or Roto-Brake systems.  Any application where motor current does not need to be supplied by the standard RT-21's internal 5A transformer.

The RT-21r can be configured for all of the same position indicator variations as the standard controllers.

Why use an RT-21r instead of simple switch control, or modified Hy-Gain boxes?
  • Adds USB and/or RS-232 control
  • Adds high resolution digital display
  • Adds Point & Shoot hands off operation
  • In most cases, improves heading accuracy
  • When used with RPU, adds PWM speed control and gradual start/stop to your system eliminating tower and rotator stresses
RT-21r Features:
  • PWM speed control effective for most rotator types (RPU only)
  • Precision ramp control for smooth starts and stops when used with RPU
  • Manual control using CCW and CW buttons
  • Point and Shoot knob for set and forget operation to 1º precision
  • The ability to correct for mast slippage using OFFSET
  • Computer control via RS-232 or USB to 1/10º  accuracy
  • Precision heading accuracy up to 1/10thº 
  • Master/Slave links two or more RT-21 for stacked arrays or turning multiple systems to the same heading
  • Counter-Rotation for single mast systems with rotator above a rotator
  • Fully programmable settings for speed, ramps, brake delay, limits and more
  • Two alternate OFFSETs for offset antenna directions on the same mast
  • Elevation and EME modes optimize for Az/El systems and tracking
  • Limits rotation for side mounts, and allows up to 720º  total rotation for supporting rotators
  • High contrast yellow-green backlit LCD with 8 brightness levels and auto-dim 
  • Many built-in safguards to protect your system from over-rotation due to internal or external failures
  • Rugged .080 aluminum chassis
  • Special advanced options for custom applications
  • Supports "Shortest Route" for rotators with more than 360º  rotation capability
  • Comprehensive SETUP Utility software included
  • Free application software for satellite tracking, and remote control and rotator sharing using standard TCP/IP (Internet)
RT-21r Specifications:


  • Approx 4” x 8” x 7” HWD
    (Not including rear terminal strip)
  • Approx 4 lb – Shipping = 6 lb 

Input Power

  • 115/230 VAC 50/60 Hz
  • Standard IEC power connector
    and 5x20mm GMA fuse


  • High contrast Yellow-Green backlit FSTN LCD
  • Wight brigtness levels w/auto-dim

Front Panel Controls

  • CCW, CW and CANCEL buttons (Operating)
  • SAVE, CHANGE, SETUP buttons (Setup)
  • Point and Shoot knob (340º = full rotation)

External Relay Control

  • CCW and CW DC relay control (12V or 24VDC relays)
  • various configurations

Operating Modes

  • Normal, Master/Slave, Master/Counter Rotate, Slave/Counter Rotate, Debug, Alt Offset

Position Feedback
Mechanisms Supported

  • Potentiometer 150 Ohm to 10 kOhm
  • Variable resistor 500 Ohm (Others accommodated with minor modification)
  • Proximity/reed switch or Hall effect up to 64 pulses/degree (divide ratio  up to 23,500)
  • 2-Bit rotary relative encoder (special order)
  • Others possible

Position Accuracy

  • Up to 1/3º for potentiometer
  • Up to 1/10º with proximity/reed switch

Brake and Reversal Delays

  • 0 to 6 Seconds

Soft Limits

  • +/- 180º from normal stop
  • Restricts rotation to zero or opens to 720º

Motor Speed Control (PWM)

  • 10% to 100% in 10% steps with 10 selectable start/stop ramp settings (RPU)
  • 100% no ramps  (Relay Control)

Computer Control

  • Compatible with all DCU 1 enabled programs
  • Expanded Ppotocol for GH Tracker and SETUP UTILITY (See manual)


  • User changeable in minutes with no soldering


  • No Motion feedback
  • Pot out-of-range (Pot Systems)
  • Counter Range Error (Pulse counter)
  • Industrial rated Transient Voltage Suppressors on all external terminals

Rear Panel

  • 8 Position barrier strip #6-32
  • Ground stud #6
  • Cable strain relief
  • USB-B
  • DB-9 RS-232


  • Limited warranty, 1 Year parts and labor
RT-21 Setup Utility:

The RT-21 Setup Utility allows you to manage configuration options and optimize other controller settings from your PC.

It also enables you to . . .

  • Change the vanity boot message
  • See a graphic representation of the rotors rotation range
  • Change the rotors rotation range
  • Modify the security setting
  • Change the NO-MOTION motor timeout
  • Perform Auto-Cal on many rotor types
  • Save rotor settings to files
  • Restore rotor settings from files
  • Test computer rotator control
Setup Utility Image 

GH Tracker - Satellite Tracking

  • Precision 1/10º automatic control
  • Optimizes your tracking program for the RT-21
  • Interfaces with WSJT, Nova and others

GH Everyware – IP Networking for your GH Controllers

  • Remotely control your rotators over the Internet
  • Share rotators on your network GH Everyware Image
GH Tracker Image 
AC Mains: 115 VAC
230 VAC (no power cable)
R options: Relay Control 24VDC
Remote Power Unit RPU
Price: $505.00