Hardwiring a phone into a GL1500SE intercom


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Okayamapiper
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Hardwiring a phone into a GL1500SE intercom

Postby Okayamapiper » Fri Feb 24, 2012 4:10 am



As my better half has decreed that I spend no more on my bike, I was wondering if there was a way to hardwire a cellphone into the passenger intercom cable or possibly adding a Y-connector to the cable for one to go to the phone and the other to my passenger?? Any golden nuggets of wisdom would be helpful as pulling a Goldwing over in the busy city streets of Japan to answer a phone is a pain....



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virgilmobile
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Re: Hardwiring a phone into a GL1500SE intercom

Postby virgilmobile » Fri Feb 24, 2012 8:59 am

I'm not aware of one on the open market,but if you don't have a CB in the bike,a interface cable MAY be tied in there.
Locate the schematic to identify the CB audio and mic inputs and couple them to the phone.
The only problem will be audio levels.You may have to build a circuit to change them to match the audio system in the bikes CB circuit.
It's a interesting idea.I don't ride with a group and have never used my CB on either bike,so I will look into the same for me and keep you posted.I'm going to use a smart phone,it has my music on it also.
For your bike,I would need the schematic for the CB pinout.

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Okayamapiper
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Re: Hardwiring a phone into a GL1500SE intercom

Postby Okayamapiper » Fri Feb 24, 2012 9:11 am

I never thought of the CB inputs... That may be the ticket. US CB radios are illegal in Japan as they overlap some of the maritime frequencies. I appreciate the advice as I think you may have provided a workable solution once I get my hands on a wiring diagram.

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virgilmobile
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Re: Hardwiring a phone into a GL1500SE intercom

Postby virgilmobile » Fri Feb 24, 2012 10:25 am

I guess first thing is to test if your mic is working in the intercom mode as it is tied into the same circuit for the CB.
If it's OK, then the next problem is to verify audio levels at the plug for the CB to see if they will match what the phone uses.
Just remember,the current phone headsets use a electric(condenser)mic that requires volts to power it.So,when the cord is pluged into the phone,expect to see about 4 volts DC on the mic input line.You can isolate that with a cap.Maybe a 0.47 x 16 volt.Positive going to the phone.

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Re: Hardwiring a phone into a GL1500SE intercom

Postby WingAdmin » Fri Feb 24, 2012 12:00 pm

It's tough to do, and it's not as simple as just plugging the phone inputs into the intercom.

I did it on my 1100 (I utilized a Bluetooth module, so the phone didn't have to be hard wired to the bike), and the same basic idea should work on any Goldwing. Virgilmobile is right about the mic balancing - that's the biggest problem. Goldwings use dynamic mics on their intercoms, whereas every modern device uses an electret mic. A dynamic mic actually produces a small amount of current when it detects sound, whereas an electret mic requires a bias DC power be applied to it, and returns its signal as a change in capacitance. The electret mic output is a tiny fraction of that of a dynamic mic.

You'll need to build circuitry to eliminate the DC bias as well as the amplification for the mic.

Another problem is that the Goldwing intercom provides sidetone (so you can hear yourself in your headphones when you talk) - and so does the phone. It's very easy to get a terrible feedback loop going, particularly with digital phones that have sidetone that is very slightly delayed.

It's a technically challenging project, which is why I haven't (yet) done it on my 1500. I wasn't satisfied with the result on my 1100 - it was far too sensitive to electrical noise. I have plans to do it again...but the last time I did it, I had SO MANY people ask me to make them one as well, I'm thinking that this time I'd like to design it so that I could actually produce it for other people as well.

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Okayamapiper
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Re: Hardwiring a phone into a GL1500SE intercom

Postby Okayamapiper » Fri Feb 24, 2012 8:19 pm

Not being a whiz with a multitester, I guess I will have to find another route... Does anyone have any experience with the Edset 3G headsets that supposedly allow you to plug a cellphone into the headset while it is connected to your intercom system?

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noeleo
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Re: Hardwiring a phone into a GL1500SE intercom

Postby noeleo » Tue Apr 03, 2012 4:01 pm

Check out the Kennedy systems at http://www.cellset.com. They have several options...
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Re: Hardwiring a phone into a GL1500SE intercom

Postby WingAdmin » Tue Apr 03, 2012 4:15 pm

Kennedy does have good options - however, they shut down (out of business) some time ago. The web site was taken over by one of the former employees, who tries to produce a few of the products in his spare time, but most of the products are no longer available.




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