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The sleeve/shield contact is always "common" between the two switch contacts. I haven't had extensive experience, but the two radios with key inputs I have used both had settings for whether tip and ring were dot and dash or vice versa (or if a straight key was connected, disabling the internal keyer). Note that this setting isn't just useful for ...


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This page appears to be what you're looking for. This technique uses the Linux LV2 plugin. You'll have to build an interface with a 555 timer chip. SETUP: an UltraPico Keyer, keys a 555 TIMER CHIP..from the audio output of the 555, an audio cable is attached and goes to the input of a laptop's mic jack input...the 555 time chip sidetone is very rough ...


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