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CTR2 supports radio and operation modes. The radio mode controls the radio’s mode, CW, USB, LSB, etc. The operation mode controls how CTR2 manages the radio and audio. Pressing either the Radio mode or Operation mode buttons (USB and CW in the bottom left of the display in the screen shot above) will open the Mode Select page.

Radio and Operation Mode Select Page

The Radio modes are straightforward. Just be aware that not all radios use the same terminology, especially for FM and Digital modes. I’ve tried to map each mode to the correct mode on the radio.

The Operation modes control CTR2’s operation. For instance, selecting CW op mode enables the CW decoder and transmit buffers, enables the keyer, and sets the bandwidth and notch filters. Every mode has its own set of filters.

Beacon mode is a special mode reserved for the International Beacon Project. You would only select this mode when programming a beacon frequency. Beacon frequencies are preloaded and appear in slots 96 to 100 on the favorite frequency list so you’ll probably never need to use this button.

Once an Operation mode is selected, use the Settings button on the Home page bottom menu to open the settings page for that mode. Once a settings page is opened you can edit the other mode’s settings using the buttons on the bottom menu.

Here’s the CW Settings page:

CW Settings Page

Here you can open the CW Transmit Memory, configure the keyer, adjust the sidetone, set the speed and Farnsworth spacing and change the bandwidth and notch filter frequencies. You can also record on-air receive traffic to the micro SD card by touching the Rx>SD button. This button appears on all Settings pages.

Voice mode settings appear on the Voice Settings page:

Voice Settings Page

On this page you can enable/disable the 5-band equalizers for the Rx and Tx, enable/disable the Transmit Audio Compression, edit the Voice Transmit Memory, set the Tx Level toward the radio, and adjust the bandwidth and notch filters. The Rx>SD button allows you to record receive audio to the micro SD card.

RTTY mode settings appear on the RTTY Settings page:

RTTY Settings Page

On this page you can modify the RTTY settings, RTTY Transmit Memory, RTTY transmit level, and adjust the bandwidth and notch filters. The Rx>SD button allows you to record receive audio to the micro SD card.

Digital mode settings appear on the Dig Settings page:

Digital Settings Page

This page allows you to modify various settings for Digital modes. No transmit buffers are provide in this mode since third-party applications provide this function.

CTR2 can act as a USB sound card for all of your radios. It also provides a virtual USB port for your PC to use so third-party apps can control the frequency and mode of the selected radio. To use these features, first select USB for Tx Audio Input and Rx Audio Output on this page then plug a micro-USB cable into your PC and the micro-USB-B connector on the Teensy 4.1 development board. Next, select the Teensy MIDI/Audio sound input and output devices in your third-party app. And finally, select the virtual serial port associated with Teensy 4.1 board on your PC in your third-party app and select the Kenwood TS-2000 radio for CAT control. Use the lowest baud rate available since this is a low priority port for CTR2.

To listen to the USB audio on headphones connected to CTR2 select Monitor = ON for the USB Tx/Rx Monitor.

Set the Transmit Level to the radio using the third-party apps’ Tx level control and the Tx Level control on this page.

You have to option to use unprocessed audio in Digital mode or use the 5-band equalizers, Tx compression, and bandwidth and notch filters in Voice Settings. To use Voice audio processing in Digital mode, touch the Audio Processing button to activate the Use Voice Filters option. Typically audio processing is provided by the 3rd party app so this option should be left at No Filters.

CTR2 contains a VOX circuit that can key the PTT on your radio when Transmit Audio is detected above a certain level. Use the VOX Trigger control to set this level and set the on Tx Audio Activity button to VOX > Radio PTT. Other options for this button are Use PTT (manually key PTT to transmit) and Pass Audio > Radio that will just pass transmit audio to the radio where you would set the radio’s VOX to key PTT.