27 May 2026

OXO classic 1W HF CW transmitter

This circuit by GM3OXO is true classic QRP transmitter. 

For serious use, a low pass filter for the band chosen should be added. I think it works on any HF band.

See https://rsgb.org/main/technical/qrp-low-power-operating/ from where this circuit was seen and taken. 

If the RSGB has a problem with me using it, I shall remove it immediately. 

There is a clearer circuit at this link.

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