Easy Rotor Control (ERC) are interfaces for connecting the antenna rotator to the computerThey are suitable for practically all common types of commercial and home-made rotators without a built-in interface. René DF9GR offers three versions: ERC kit (azimuth), ERC-3D kit (azimuth and elevation) and ERC-R in the form of a mounted PCB (azimuth and elevation).
These simple interfaces significantly increase the comfort and efficiency of antenna rotation. They communicate with the computer using commonly used protocols DCU-1, or GS232A/B. Although DF9GR provides a simple service software, most users will probably use this option directly from some log. You can find a list of compatible software and hardware on the website https://www.schmidt-alba.de/eshop
In the winter, I ordered, assembled, and installed two pieces of ERC into Yaesu and CDE (Hy Gain) rotators.
The principle of operation is shown in the block diagram. At the heart is a microprocessor with a program that mediates information about the current azimuth to the computer and at the same time translates instructions from the computer to switching relays that rotate the rotator motor.
Ordering through the web is simple, and if needed, René will gladly help. Builders can also register in the discussion group and share their knowledge with others. The package from DL arrived in about a week. Inside, all parts are carefully sorted in bags. Documentation (in English and German) and software are supplied on CD. The package includes a schema, only an assembly plan, and photos that are very helpful in assembling the kit.
Assembly of the Easy Rotor Control kit to connect the antenna rotator to the computer
Component placement is not demanding and takes about two hours. It starts with making the connecting cable. Attention should be paid to the correct polarity of electrolytic capacitors, diodes, transistors, and IO. Although René does not provide an exact assembly procedure, it is advisable to start with smaller components and install relays and terminals last.
Revitalization consists only of stabilizer function check. If everything is fine, we can install IO into the sockets. Then we can connect the interface to the computer and check if the module is communicating with the software. If yes, read data will appear in the lower part of the program window, e.g. firmware version. COM1 is preset, if the module is connected to another one, we still need to change the settings and read the data by pressing the button.
Installation of ERC into the rotator
The more demanding part is the integration into the rotator. This point is addressed in a separate document with over forty pages, where the connection to most commercial rotators is detailed and illustrated. I recommend following the scheme. Most of the functionality difficulties are caused by poor cabling in the rotator. The description may also include changing the ERC setup (brake activation) and power supply method. Usually, ERC requires an external power supply 10 to 15V.
Tested software with Easy Rotor Control
Easy Rotor Control worked on the first try in both of my rotators. I have tried several software:
- DF9GR - functionality is flawless, but control comfort is weaker
- N1MM Rotor - can control the rotator and rotate the antenna after entering the prefix or azimuth, but does not display the current azimuth
- HamRadio Deluxe - works flawlessly
- PSTRotator AZ - excellent program with great antenna rotation comfort. It also allows remote control
Video of using ERC RS232 rotor interface
You can watch a demonstration of simple control from N1MM Rotor in the video The ERC RS232 rotor interface:
ERC is suitable for moderately skilled constructor, but it is a very useful accessory that almost every radio amateur will appreciate.