Problem with HJC 21B

Bruce Dahl

9 octobre 2024 03:18

I have an HJC helmet with an integrated 21B bluetooth module. I also have a Schuberth helmet with an integrated SC2 module.

When riding above about 70kph the HJC module and when communicating with my Schubert module, the voice breaks up really badly to the point where I cannot understand what is being said.

I have checked that both modules firmware are up to date and that all settings are correct.

I have an SMH10 module, purchased last year, and the HJC 21B module does the same with it. The SMH10 module and the Schuberth SC2 modules communicate clearly with each other.

Has anyone had a similar problem?

Cheers, Bruce

 

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  Support Agent MB

  23 octobre 2024 07:16

  It seems like the issue might be related to the HJC 21B Bluetooth module, given that both the SMH10 and Schuberth SC2 communicate clearly with each other. Here's what could be happening:

  1. Antenna or Signal Interference: The HJC 21B module might be experiencing interference at higher speeds, possibly due to wind noise or vibrations affecting the signal quality.

  2. Wind Noise and Mic Sensitivity: At speeds above 70 kph, the microphone sensitivity or wind noise suppression of the 21B might not be as effective, leading to degraded communication. This could be different from how the SMH10 or SC2 handle wind noise.

  3. Pairing or Codec Mismatch: The HJC 21B might have trouble with the specific codec or pairing protocol used with the Schuberth SC2, even if firmware is up to date. There might be some compatibility issues that aren't immediately obvious.

  Possible solutions:

  • Re-pair the devices: Try deleting all pairings from the 21B and SC2, then pair them again.
  • Check mic placement: Ensure the microphone inside the HJC helmet is positioned optimally to reduce wind noise.
  • Test with another HJC module: If possible, try another 21B module to see if the issue persists. This could help determine if it's a hardware issue.
  • Check settings: Although you mentioned settings are correct, some Bluetooth intercoms have advanced noise cancellation or intercom-specific settings that may need to be tweaked.

  Some riders with similar experiences have had success by using a mesh network communication instead of traditional Bluetooth, depending on what the module supports.

  Let me know if you'd like more suggestions or specific troubleshooting steps!

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