开云体育

I just released Raduino v1.16, download it from

New in v1.16: CW SPOT button for zero beating

Connect a momentary pushbutton to Arduino pin D5. A SPOT tone will be heard when D5 is connected to ground.
By aligning the CW Spot tone to match the pitch of an incoming station's signal, you will cause your signal and
the other station's signal to be exactly on the same frequency (zero beat).

See Dave KE0OG's video at for a nice tutorial on how to use this feature.

73 Allard PE1NWL