REFLECTOR: Fwd: Re: Noise in the Cockpit

[Ron N VelocityXLFG]

Thank you

I have done all you have  described.
No Radio ,Radio switch off, just the intercom on . Alternator 
disconnected ,Pulled fuse, When I disconnect  the mic, Pull plug 
Hissssss goes away.
Hand over Mic does not have any affect also.

The ANR head set removes much of the cabin noise just not the hisssss.

Very confused I am thinking something with the mic circuit.

Ron


On 9/26/2013 12:35 PM, Laurence Coen wrote:
> Ron,
> Most electrical noise related to engine speed are different than what 
> you are describing (ignition pulse or alternator whine). As others 
> have suggested you need to find the source. In your original post you 
> suspected the mike.  Unplug the mike while listening to the ATIS to 
> test it out.  Turn off your radios to see if they are the source of 
> the noise.  Since this noise is related to engine speed, try turning 
> off your alternator.  Try a passive headset to see if your electrical 
> system is somehow messing with the noise canceling electronics.
> Good luck.
> Larry Coen
> N136LC
>
> *From:* velocityxl <mailto:velocityxl at fastmail.fm>
> *Sent:* Wednesday, September 25, 2013 10:37 PM
> *To:* Velocity Aircraft Owners and Builders list 
> <mailto:reflector at tvbf.org>
> *Subject:* Re: REFLECTOR: Noise in the Cockpit
>
>
>
> Yes I have squelch . The hisssssss gets so load I can barly here the 
> atis or the tower.
>
>
> Sent from Ron's Samsung tablet
>
>
>
> -------- Original message --------
> From: Laurence Coen <lwcoen at hotmail.com <mailto:lwcoen at hotmail.com>>
> Date: 09/25/2013 11:14 AM (GMT-06:00)
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org 
> <mailto:reflector at tvbf.org>>
> Subject: Re: REFLECTOR: Noise in the Cockpit
>
>
> Ron,
>
> Doesn't your intercom have squelch?  If it does then you shouldn't 
> hear any
> noise from the mike.  I flew my plane with no interior for some time and
> expected it to be a lot quieter with upholstery.  I used cloth over 1/4"
> foam.  The effect on the noise level was disappointing.  I used a sound
> level meter to measure the difference with and without upholstery and 
> there
> was only a 2db drop.  Hardly enough to even notice.
>
> Your mileage may vary.
>
> Larry Coen
> N136LC
>
> --------------------------------------------------
> From: "Ron N VelocityXLFG" <velocityxl at fastmail.fm>
> Sent: Wednesday, September 25, 2013 9:36 AM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: REFLECTOR: Noise in the Cockpit
>
> > My plane is quite noisy . The noise is a  loud hissssssss that 
> increases
> > as engine Rpm increases. The sound  seems to be coming
> > from the mic. I have done some testing and the best Solution I have 
> been
> > told is to get
> > the Oregon Aero Mic covers.
> >
> > I do not have a full interior in my plane yet so the question of the 
> day
> > is does the cloth
> > interior help a lot to reduce  cabin noise. I was going to paint the
> > interior but if the
> > cloth interior quiets it down may be I will go with the cloth interior.
> >
> > I do have noise canceling head sets not the best but do work well in 
> other
> > airplanes I have flown in.
> >
> > Ron
> >
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