Head Set Buzz

[PC]

I have a electricery problem   

I am running a hard wired autocom system with uhf & I pod    Santy dropped of a Zumo 590 Gps wich I have fiited to the bike
Since this was fitted I have a buzz in the head sets   this buzz alters with engine revs  when you first start the bike it is not there it comes it starts soon after then goes out at 3200 revs I suspect that when the battery is accepting power from the alternator there is no buzz
I sourced a power feed from a vacant plug on the left side of the fuel tank thinking this mite be the problem I have run power directly from the battery    it is still there   seems slightly worse        now at 3500 revs it drops off but not completely as before
not sure what to try next    any ideas guys?

Peter

[ST2UP]

Where is your earth from Pete ? Battery or Chassis ?? So many Alternator whines are earth related 

An inline suppressor on the power feed to the GPS is a simple method.....



Cheers

[Gadget]

What Chris said.

The wine is the unregulated Alternating current from the alternator. It is impossible to completely filter it out to DC. The week always be a little bit of ripple.

Having said that, a suppresor (capacitance to ground/chasss) can "short" the high frequency ripple to ground but not the DC.

[Brock]

I have an inline choke (toroid filter), to reduce high frequency buzz getting into my audio system, capacitive filters from the positive to ground also assist in this.

It would take a long time to analyse and test solutions, as it would take an electronics lab to see whats happening, and fix the problem.

Part of the problem can be the wired intercoms, as these have long wires that can act as antennae to re introduce noise. There are also things called earth loops that can be bad things.

[PC]

Thank you guys for your replies
so here is the situation now since installing the gps I have just put it in the cradle when it got power it turned on  when it lost power it turned off   today I put gps in cradle it turned on (no switch in line as  experimenting ) so I turned it off went and did a few other jobs then came back to start with your idea's  before i did anything I thought I will just check again   started the bike had no buzz turned gps on no buzz
so the problem has left the building at this stage      am feeling like a goose at the moment  I may have rectified the problem but not sure how
  Peter

[Biggles]

It's a type of computer.  When you have a problem, you turn it off and on again and it thinks it's a new machine.         

[Brock]

It could have been a microscopic piece dust on a contact...