RemoteQTH

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====== Icom VS-3 Bluetooth headset review ======
{{https://remoteqth.com/img/wiki-VS-3.jpg?400}}

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===== CW operation =====
  * 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. \\ {{https://remoteqth.com/img/wiki-IC-705_30ms_delay_at_28WPM_dots.png?400}}
  * 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.

===== SSB operation =====
  * 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. \\ {{https://remoteqth.com/img/wiki-IC-705_1s_sweep_6kHz.png?400}}
  * It is a one-second chirp with a 6kHz lift.

===== PTT =====
  * The **PTT** button is **very practical and works flawlessly.**


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===== Conclusion =====
  * 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.