CTR2-Duo

August 26, 2026

USPS has changed the way it handles international shipping costs. Please see my post here for more information.

To eliminate confusion over CTR2-Flex hardware and CTR2-Flex firmware, the CTR2-Flex dual-encoder units have been rebranded as CTR2-Duo. There is no change in the hardware. CTR2-Duo runs the CTR2-Flex/CTR2-Dial dual-boot firmware.

• Select the type of enclosure from the options below. You can select the commercial, New Age injection molded, CNC machined enclosure or the 3D printed enclosure.
• Select the firmware you’d like your unit to boot into on delivery. You can change the boot firmware at any time from the Settings menu.

When running CTR2-Flex firmware, you can connect to, and control your Flex 6000/8000 series radio over WiFi using the Flex API. This mode is a true radio controller and includes a dashboard display where you can easily select and control many parameters on your radio. You can run any version of SmartSDR in parallel with CTR2-Duo.

When running CTR2-Dial firmware, the unit becomes a MIDI controller and can control any radio control app that supports MIDI control, including Marcus’ (DL8MRE) SmartSDR for iOS/MacOS, SDR-Control, FT-Control, TS-Control, and K4-Control. It can also be used with many Windows based control packages such as Thetis and SDR-Console, and many more.

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Please enter your call sign in the Add a note to your order section on the Checkout page so I can create your registration key.

Also, if you’re planning on using CTR2-Duo in CTR2-Dial (MIDI) mode with a radio control app such as SmartSDR for iOS/MacOS, let me know which app you’re running in the Add a note to your order section on the checkout page and I’ll load that app’s configuration into your unit. This way, you’ll  only need to import your app’s MIDI map from the CTR2-Dial Configuration Files page to be ready to go.

You can find the list of control apps I have configurations for, and the map files for them, on the configuration files page.

If you don’t specify a control app configuration, your unit will ship configured for SmartSDR for iOS/MacOS.

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