Icom VS-3 Bluetooth headset review

The signal is delayed by 30ms, so it is not possible to keying CW from the local paddle. On the oscilloscope we see the yellow original CW dots at a speed of 28 WPM and on the blue waveform the audio is delayed via the VS-3 Bluetooth module.

The telegraph signal rings/rattles unpleasantly in high tones. Audio is at the limit of applicability. It would probably be enough to add a simple low pass filter. The emphasis on high tones can be seen on the next sweep measurement in SSB mode.

Signal delay in SSB mode does not matter. The audio accentuates the higher notes, but it's not annoying. On the image from the oscilloscope we see a yellow signal representing the original audio from the headphone output, which slightly suppresses the higher tones. The blue waveform shows the audio from the Icom VS-3 Bluetooth module, which significantly emphasizes high notes and adds noise.

It is a one-second chirp with a 6kHz lift.

The PTT button is very practical and works flawlessly.

The latency of the audio signal delay is a property, it is not a device error.

Suppression of high frequencies would probably improve the useful properties of the device, which are good except for the CW mode.