Strobe Noise In Headsets

[penguin]

Do you have the plastic isolation washers on the tel plug? Ground the headset plugs on the panel can often result in unwanted noise - should be grounded back to intercom/audio panel.
Pete

[luv2flypilot]

Originally Posted by penguin

Do you have the plastic isolation washers on the tel plug? Ground the headset plugs on the panel can often result in unwanted noise - should be grounded back to intercom/audio panel.
Pete

Yes but it should not effect my panel since the jacks are mounted within the carbon fiber panel frame and not touching any metal. I tried the Ferrite Clamps with no success. I just received an Elminator Filter made by Lone Star Aviation. I will install it tomorrow on the com/intercom power line and report back if it helps.

[vic syracuse]

The carbon fiber is conductive.

Vic

[Techgeek]

The noise you are experiencing through the audio could come from different sources:
[*]Poor ground at the strobe power supply.[*]Poor ground connection at the battery[*]Battery that is weak or not in good condition.

My advice that you only use shielded strobe cables if using a standard strobe power supply.

You don't need shielded cables if you switch to LEDs. Strobe LEDs come with the flasher built into the light so you don't need a power supply box (less weight). We do have LED strobes if you need them: http://www.strobesusa.com/interior-e...ystems-c-6_28/

[BillL]

Originally Posted by rv7charlie

1st step, determine where the noise is entering the system. Do you hear it with the radios off? With radio volume turned all the way down? (Both comm & nav if you have 430+ type multifunction boxes.) Does a handheld portable comm pick up the noise?

Can you control the noise with the intercom volume control?


(The answers will help determine how the noise is getting into the audio system.)


If you still have the noise with all radios off, volumes down, etc, you likely have noise traveling on the power wires, either B+ or ground. Start looking at grounds. Make sure that all grounds for the avionics gear go to the firewall ground buss.

Before trying to pull new wire through the wings, you can unmount the strobes & run temporary pairs without the strobes being grounded to the airframe.

Re-check the power supplies. Disconnect the ground wires & check whether the power supply chassis is grounding directly to the airframe. If yes, unmount & temporarily insulate from the airframe & reattach your 'home run' grounds.

After each ground isolation/home run of ground, re-test.

If you still have issues, inductor/capacitor filter networks on the power supply leads may be in order.

Last (or maybe first), try to be realistic about how bad the noise really is. do you think you'll be able to hear it with the engine running?

Originally Posted by Techgeek

The noise you are experiencing through the audio could come from different sources:
[*]Poor ground at the strobe power supply.[*]Poor ground connection at the battery[*]Battery that is weak or not in good condition.

My advice that you only use shielded strobe cables if using a standard strobe power supply.

You don't need shielded cables if you switch to LEDs. Strobe LEDs come with the flasher built into the light so you don't need a power supply box (less weight). We do have LED strobes if you need them: http://www.strobesusa.com/interior-e...ystems-c-6_28/

Maybe I missed it but have not read yet that you did basic diagnostics to determine how the noise is getting into the com. Did you find if it is through the power supply or RF yet? The solutions are different. Is the strobe noise picked up with a handheld radio?