Beautiful work Gary, and great to see that you are putting ideas from Pete and from Don Cantrell in your rig.
Gary wrote:
Don and Pete,
I thought you would be interested in the QRP station accessory I added to my version 3 microbitx transceiver. In addition to using Don's AGC and Reverse/Forward Power and SWR circuits, I developed another board using a separate Nano and TFT display to show day, date, time, temperature and humidity as well as showing the relative audio strength in three separate bands centered on 400 Hz, 1000 Hz and 2500 Hz. In addition, when I put the transmitter in a 'tune' mode the power out and SWR will show on the TFT display as well. The date, time, temperature and humidity information is updated once every minute, the audio is displayed continuously during receive and the power/swr is only displayed when the transmitter is activated.
The audio frequency analyzer is based on the MSGEQ7 microchip and it actually picks up the audio strength in 7 bands covering 63 hz to 16,000 hz. I just display the three most likely to show up in a SSB transmission. You can see a 'live' example near the end of the video showing a 20 meter QSO and how the audio strength by audio frequency varies over time.
This project falls into that 'frivolous but fun' category that was a challenge to design but I doubt many other hams would want to replicate it. I learned a lot and wanted to thank both of you for arduino scripts, useful circuits and lots of inspiration for getting started. I have long admired the work both of you contribute to our hobby.
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Neat and cool job. DE Kang.K.P.S.
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