Green Heron Engineering RT-21 firmware

Firmware history

All versions below were published by Green Heron Engineering on greenheronengineering.com. Third-party and modified firmware is never listed.

1. Version 4.13.2 Latest Released Sep 9, 2026 First seen Sep 9, 2026

   Adds LAN and direct TCP modes for Ethernet or WiFi. — summary by updatemystuff.com

   Source: greenheronengineering.com

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   The current RT-21 version 4 firmware. V4.1​3 adds LAN and direct TCP modes for Ethernet OR WiFi NOTE: Version 4 FW is only for controllers above s/n 4000 (v4 controller CPU) .zip includes latest firmware​ for K7NV (Prop Pitch) and K0XG units as well.

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2. Version 3.08.9 Released Sep 9, 2026 First seen Sep 9, 2026

   Source: greenheronengineering.com

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   RT-21 Firmw​are latest v3 Release along with complete RT-21 revision history and load instructions. 3.08.9 f​or s/n 2000 to 3999 units (v3 ONLY) .zip includes firmware for K7NV (Prop Pitch) and K0XG units as well.

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3. Version 1.07.n Released Sep 9, 2026 First seen Sep 9, 2026

   Source: greenheronengineering.com

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   RT-21 1.07.4

   Old version for RT-21 below s/n 2000. must be 1.nn firmware unit.

   Downloads for K0XG, K7NV and RT-21 RT-21 Az El Firmware 1.04 RT-21 Az El Firmware Current​ Release 1.04 Nov 11, 2015 Adds Brightness Control for OLEDS v2.0 RT-21 Az El Firmware Version 2 RT-21 Az El Firmware Latest Release 2.013 Download includes Beta version 2.a014 for latest SVH7 Slew Drives (See Note) DO NOT INSTALL IN V1 Controllers!

   See the text document and the Az/El V2 manual for more information and revision history.

   RT-21 GH Map Version 2.0.2 adds embedded Java (see Release Notes) A simple and basic graphical RT-21 control program intended for mouse or touchscreen operation by dragging the desired beam pattern to a desired heading.

   This program supports up to three rotators on one graphical display.

   We provide a default compass rose background but you can utilize any graphical background you wish.

   Background Azimuth projection maps centered on your QTH are readily available on the web and can be simply selected for use as your background image.

   RT-21 Console Firmware RT-21 Console is a download firmware load for any RT-21 that converts that unit into a control console for another RT-21 controller.

   Essentially, the RT-21 Console implements a “computer terminal” in an RT-21 unit that sends and receives RT-21 commands over an RS-232 link​.

   Both the rotor connected RT-21, and the RT-21 Console can control the attached rotator, and view headings.

   RT-20 Last Production Versions (OLD) Old RT-20 firmware….in RT-20, there are different loads for AC motors than for DC motors.

   The 2.02 is the AC motor version (Hy-Gain, create etc.) The 1.05 is the DC motor version (Orion, SPID etc) TIC Rings, K0XG, and Prop Pitch versions are all separate and the files are included.

   The ending ‘a’ denotes a PCB version of 1.8 or later.

   Earlier boards used the firmware NOT ending in ‘a’ The included loader must be used….after starting the load, you must cycle power quite quickly….< 1/4 second off time.

   Call us if you need help…but we would recommend that it’s better to spend the $25 for an RT-21 CPU upgrade instead.

   Jeff – W2FU GH Tracker 1.24 Newest Version includes MacDoppler UDP interface 1.24 includes imbedded Java Runtime, no need to download or maintain Java on your computer. 1107 Salt Road Webster, NY 14580 Green Heron Engineering LLC.

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