One of the challenges of having an article published in a conventional magazine like QEX is the lead time required between article submittal to actual publication. I submitted the first article on CTR2 to ARRL back in October 2020. Over the next few months CTR2 underwent substantial changes in the hardware, the firmware, and the content of the article. The article was updated several times to cover those changes and the final version was approved in January 2021. Needless to say, more changes have occurred since the article was ‘locked down’.

The ARRL is kind enough to host the various files associated with this project on their web site, Those files were current on the date the article was published but will not be updated as changes are made in the CTR2 ecosystem

I will always maintain the latest files on this site. Visit the Download pages to get them.


May 25, 2022 – v1.02.11: Fixed a bug that may cause data corruption or lockup when editing text strings

NEW FLEX FEATURE: Starting on v1.02.01 I added the ability to key your Flex radio with your paddles or straight key over WiFi.

CTR2-Mini firmware is currently in active development with new changes and bug fixes coming out every day or so. You should check the CTR2-Mini firmware download page often to see what’s been added and/or fixed.


March 21, 2022 – v1.01.01 Update – Minor update to add the auto-keyer speed feature. Add a * before and after text in the transmit buffer to increase the sending speed for that text. This is handy for contesters that send ‘599’ signal reports on every message. Add *599* to the send the report 50% faster.

I’ve uploaded new firmware for CTR2, the Nextion displays, and Node-RED for CTR2 These updates fix various bugs and add new functionality. I highly recommend upgrading the firmware on your devices. Details can be found on each download page in the links above.

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