I’m pleased to announce a new version of CTR2-Mini called the CTR2-Mini+. This version has several enhancements over the basic CTR2-Mini that make it easier to build, more flexible, and depending on how you configure it, cheaper.

In case you’re wondering, the original Mini will still be available.

The new Mini+ has the following upgrades:

  • A built-in 12 VDC power supply allows you to power the Mini+ from your station power supply. You can also power the Mini+ using the USB-C connector on the front of the Wio Terminal, just like the Mini.
  • A built-in Radio I/O circuit allows you to control one radio without using an external Radio I/O module.
    • The RJ45 jack is optional so you can still use the Mini+ with the CTR2-Mini Radio I/O module if you have more than one radio you want to control
  • A built-in 6-button keypad is provided so you don’t need an external function keypad
  • A new sidetone amplifier with a volume control and on/off switch, and a front mounted speaker and headphone jack make the sidetone more usable.
  • Several enclosure options to choose from:
    • A custom acrylic stand will position the display at 45 degrees like the Mini
    • Use a PacTec KEU-5 case as shown in the lead photo. This positions the display at 10 degrees. A wedge under the case can tilt the display if a steeper angle is desired.
    • The front panel can be mounted horizontally above the base PCB
    • The front panel can be rack mounted

I just received the v1.0 PCBs for the Mini+ and of course there are changes that I need to make to them before I make them available. Here are a few photos to show the current v1.0 configuration. The last photo is a mock-up that shows the v1.1 front panel that will be available in the production unit.


This is a close up of the v1.0 front panel mounted on the acrylic enclosure. The HP jack is for using headphones with the sidetone amp. The oval is the small speaker (also used on the Mini). The volume control has and on/off switch to control the internal 12 volt power supply.

Here’s the side view of the acrylic stand showing the front panel mounted to the stand and the main PCB on the bottom.

This is the rear view of the Mini+ in the acrylic stand. You can see there are two additional 1/8″ stereo jacks on the back. These are for the onboard Radio I/O circuit. The one next to the RJ45 jack connects to the radio’s CAT port. The next jack connects to your radio’s Key and PTT inputs. The third and forth jacks from the left are the Remote PTT Input and Paddle jacks. These are the same as on the Mini.


Here’s a couple of photos of the Mini+ PCBs mounted in a PacTec KEU-5 enclosure. The lead photo shows the front view of the Mini+ in the KEU-5 enclosure.

This is the right side view showing the 10 degree angle of the enclosure. The display is viewable at this angle but I’ll create a wedge stand to prop the case up at a steeper angle. The new v1.1 front panel PCB will fit into the recess on the top of the KEU-5 enclosure so it will be flush with the top of the enclosure.

Here’s the left side.


Finally, here’s a mock-up of the v1.1 front panel showing the layout changes. I moved the controls around to provide more room for the keypad. Having the encoder mounted toward the center eliminates the need for a left and right-hand version. The speaker grill and the rounded silkscreen around the volume and keypad give it an ‘old-timey’ look that I really like.


Let me know what you think of the new Mini+.

73, Lynn, KU7Q