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post #1 of 16 Old Jul 11th, 2007, 4:38 pm Thread Starter
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Question Buzz, click, click,click!

I have a Garmin 2720 and a chatterbox Communicator. I will probably got to the Starcom1 Advanced. I use the GPS with the motorcycle hardwire. If I plug a headset into the GPS output, it works fine. If I connect it to my Chatterbox, I get a click, click, click, buzzzzing sound. I've tried making Messenger13's multi box with 10k and 4.3k ohm resistors, but it only reduces the volume. What the heck is wrong?

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
BMWMOA #113448
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post #2 of 16 Old Jul 11th, 2007, 4:49 pm
 
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This will sound werd but, it's the only way mine worked on my Wing. Try this, plug the audio jack in all the way then back it out one click. You are getting the same noise I got on my Wing when I plugged in my 2620. It was something to do with the way the system was grounded. All I did was back the plug out a little & tapped it up, never bought the $200 gadget that allowed it to be plugged in all the way.
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post #3 of 16 Old Jul 11th, 2007, 6:48 pm Thread Starter
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Tried it..... next idea? Inotice when I start to plug the GPS into the Chatterbox, just touching the tip causes the same buzz. I tried a different wire, so it's not a short. I've also tried plugging into the Chatterbox music input as well as the aux input. Both the Chatterbox and GPS are wired to the battery +/- terminals.

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
BMWMOA #113448
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post #4 of 16 Old Jul 11th, 2007, 9:58 pm
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All grounds are not equal

You are on the right track, there is a "ground loop" between the audio leads and the power leads. The right way to fix this is with a ground isolation transformer in the audio lead. These can be purchased, and are usually pretty expensive since they use high quality transformers (intended for high quality stereo sound), but since this is a GPS, we can get buy with much less. If you are good with a soldering iron, go to Radio Shack and pick up a 1:1 transformer and make up a cable, wiring one side of the transformer to the GPS and the other side to the Chatterbox. See attached picture.

-Scurrie
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post #5 of 16 Old Jul 11th, 2007, 10:19 pm
 
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I have also heard of people splitting the cable & cutting the ground loop.
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post #6 of 16 Old Jul 12th, 2007, 11:21 am Thread Starter
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Quote:
Originally Posted by scurrie
You are on the right track, there is a "ground loop" between the audio leads and the power leads. The right way to fix this is with a ground isolation transformer in the audio lead. These can be purchased, and are usually pretty expensive since they use high quality transformers (intended for high quality stereo sound), but since this is a GPS, we can get buy with much less. If you are good with a soldering iron, go to Radio Shack and pick up a 1:1 transformer and make up a cable, wiring one side of the transformer to the GPS and the other side to the Chatterbox. See attached picture.

-Scurrie
Offwego to Radio Shack! I will advise outcome tonight!

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
BMWMOA #113448
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post #7 of 16 Old Jul 12th, 2007, 3:42 pm
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Smile

radio shack has an isolation transformer that is $2.69 works great. When you get to the Escort Radar detector then you will need the one from Excort, I couldn't make one that worked, but their $25 cable did the trick.

--Bo
2013 Magma Red R1200GSA
2012 Candy Apple Red R1200R
2007 (2006 Blue Panels) R1200GS (RIP Poteau, OK)
2006 Graphite K1200GT (sold)
2002 Titan Silver LT (sold)

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post #8 of 16 Old Jul 12th, 2007, 4:29 pm Thread Starter
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Angry

Quote:
Originally Posted by Texas42
radio shack has an isolation transformer that is $2.69 works great. When you get to the Escort Radar detector then you will need the one from Excort, I couldn't make one that worked, but their $25 cable did the trick.
My Radio Shaq looked at me like I was some sort of biker freak. I called first and they checked their computer and said they had 3 in stock. When I got to the store the guy said "no, we dun't kerry nun ov dat stuff" The manager then looked in a drawer and said "no we dun't got it" I live in Miami and English is not the primary language! Anyway, I'll have to order it off the web.

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
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post #9 of 16 Old Jul 12th, 2007, 5:00 pm
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I get the same response, I just printed off the picture and they went oh that's what that is. It was hanging right there they just didn't know what it was. It took four (4) of them to find it.

--Bo
2013 Magma Red R1200GSA
2012 Candy Apple Red R1200R
2007 (2006 Blue Panels) R1200GS (RIP Poteau, OK)
2006 Graphite K1200GT (sold)
2002 Titan Silver LT (sold)

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post #10 of 16 Old Jul 17th, 2007, 7:44 am Thread Starter
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Question Frustration builds.....

Quote:
Originally Posted by scurrie
You are on the right track, there is a "ground loop" between the audio leads and the power leads. The right way to fix this is with a ground isolation transformer in the audio lead. These can be purchased, and are usually pretty expensive since they use high quality transformers (intended for high quality stereo sound), but since this is a GPS, we can get buy with much less. If you are good with a soldering iron, go to Radio Shack and pick up a 1:1 transformer and make up a cable, wiring one side of the transformer to the GPS and the other side to the Chatterbox. See attached picture.

-Scurrie
Ok, I got the 1:1 transformer from The Shack. I cut my homemade mono cable and soldered it in line and then tried it. No more buzzing or crackle but the volume is soooo low I can barely hear it even with my volume all the way up. Any ideas on what's wrong here? Did I wire the transformer backwards?

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
BMWMOA #113448
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post #11 of 16 Old Jul 19th, 2007, 8:33 am Thread Starter
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Exclamation It works!

Quote:
Originally Posted by Offwego
Ok, I got the 1:1 transformer from The Shack. I cut my homemade mono cable and soldered it in line and then tried it. No more buzzing or crackle but the volume is soooo low I can barely hear it even with my volume all the way up. Any ideas on what's wrong here? Did I wire the transformer backwards?
Ok, now for the follow up. I made the ground loop isolator and Messenger13's extra connector majic box. I connected my Ipod and GPS to the majic box and then connected the magic box to the Chatterbox's audio input. The GPS is connected with the isolator cable And it works! Thanks to everyone for all you help.

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
BMWMOA #113448
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post #12 of 16 Old Jul 19th, 2007, 2:19 pm
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Too much load?

Quote:
Originally Posted by Offwego
Ok, now for the follow up. I made the ground loop isolator and Messenger13's extra connector majic box. I connected my Ipod and GPS to the majic box and then connected the magic box to the Chatterbox's audio input. The GPS is connected with the isolator cable And it works! Thanks to everyone for all you help.
So on the first try, were you connecting the GPS and the iPod with a Y cable? That could explain the low volume if the iPod was loading down the GPS audio output.

-Scurrie
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post #13 of 16 Old Jul 19th, 2007, 2:28 pm Thread Starter
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Quote:
Originally Posted by scurrie
So on the first try, were you connecting the GPS and the iPod with a Y cable? That could explain the low volume if the iPod was loading down the GPS audio output.

-Scurrie
First go I tried to connect the IPod to audio and the GPS to AUX on the Chatterbox. Then I tried to connect using Messenger13's majic box, both to the AUX, but had the buzzing. Then tried the ground loop isolator on the GPS and that eliminated the buzz, but the volume was too low. Then connected gps with ground loop to majic box and IPod to majic box to aux. Then after all else failed the connected IPOD and Gps with isolator on GPS lead to audio input and it works! I had a lot of fun with the soldering iron. I think my aux input is malfunctioning. So, Y connector won't work as the GPS is hard wired to bike and gets a buzz. It has to have a ground loop isolator as pointed out to me. Perhaps using it and a Y would work, I don't know.

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
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post #14 of 16 Old Jul 20th, 2007, 2:31 pm
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I too am having the same issues. Would be pleased to know what "Messenger13's extra connector majic box " is.

Thanks

Gene
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post #15 of 16 Old Jul 20th, 2007, 7:13 pm Thread Starter
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Cool majix box

Quote:
Originally Posted by GBaker
I too am having the same issues. Would be pleased to know what "Messenger13's extra connector majic box " is.

Thanks

Gene
This allows you ta add two items to one input.
http://www.bmwlt.com/forums/showthread.php?t=21880

He's smart!

Craig

2000 K1200LTC "Little Turd"
2001 Harley Softail Deuce "Ground Pounder"
BMWMOA #113448
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post #16 of 16 Old Jul 20th, 2007, 7:41 pm
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Thanks Craig.

Gene
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