CTR2-Quad

August 26, 2026

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

CTR2-Quad provides four programmable dual-function knobs, two programmable dual-function buttons, and separate jacks for CW paddles and your key and PTT switch, you’re sure to find the Quad to be the most useful accessory in your shack.

CTR2-Quad can run CTR2-Flex or CTR2-Dial firmware.

• Select the firmware you’d like your unit to boot into upon 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/Aurora 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-Quad. You can even have multiple CTR2-Uno, CTR2-Duo, or CTR2-Quad units connected to your radio at the same time, with each controlling a different, or the same slice.

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. I have maps and configurations for various app here. I will be adding other 3rd-party apps to the configuration file as time permits.

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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-Quad 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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