Noisy Bluetooth headsets


Information and questions on GL1500 Goldwings (1988-2000)
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tmilam
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Noisy Bluetooth headsets

Postby tmilam » Tue Apr 01, 2014 4:51 am



Installed Bluetooth headsets on my 1500 wing over the weekend. Also installed two 12v accessory plugs for charging the Bluetooth Stereo Transmitter and headsets while riding. The 12v plugs are wired into the two accessory screws on the fuse block. After install I took a short ride to try them out. With the transmitter plugged in for charging, I get a lot of engine whine threw the headset. Unplugged from charging, the sound is crystal clear. Anyone else have this issue with Bluetooth set ups? How do I solve this issue?



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artgrantz
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Re: Noisy Bluetooth headsets

Postby artgrantz » Tue Apr 01, 2014 5:08 am

You need some type of noise filter in the circuit. You might be able to use the filters that put in during CB installation, but they might be expensive.
I would go to Radio Shack, explain the problem and see if they have anything to help. You might also contact the headset manufacturer or check their website.
Good luck

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TheChief
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Re: Noisy Bluetooth headsets

Postby TheChief » Tue Apr 01, 2014 6:22 am

Art it correct. What you are hearing is called "Backaway Noise" from the alternator. You need a noise filter between your charger and +12 volts. If Radio Shack can't help, try Crutchfield.
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Re: Noisy Bluetooth headsets

Postby WingAdmin » Tue Apr 01, 2014 10:15 am

This is not alternator noise, this is ground loop noise. There is a voltage differential between the ground of the charging circuit and the ground of the microphone input. Because the microphone circuit by design amplifies small signals greatly, it amplifies this differential, and the result is that it picks up any noise in the electrical system - which means that tiny bit of alternator ripple gets amplified into a large whining noise.

For line level circuits (i.e. headphones) you can get away with using a ground loop isolator. Unfortunately, ground loop isolators will kill any microphone signal.

You can try connecting the ground of your charging circuit directly to the ground of the headset/microphone. That's your best bet. Apart from that, you'll have to find a way to isolate the charging circuit from the power it's supplied from. A 12 volt DC to DC converter/isolator. Most of the ones I see are quite large and designed to handle large loads. I don't know if anyone makes a smaller one that could fit in the bike.

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Re: Noisy Bluetooth headsets

Postby Wayne » Tue Apr 01, 2014 3:06 pm

Very common problem with this type of installation. I would recommend a GLI , ground loop isolater at the audio input of the B/T transmitter.

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tmilam
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Re: Noisy Bluetooth headsets

Postby tmilam » Tue Apr 01, 2014 4:11 pm

Thanks everyone for the inputs. I know a guy who installs aftermarket stereos on Harley's. I will get in touch with him to see what he uses on the hi-watt amps.




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