REFLECTOR: Fwd: Re: Noise in the Cockpit

[Don Johnston]

>When I disconnect  the mic, Pull plug Hissssss goes away.

Sounds like a problem with the headset.  Have you tried a different headset?


On Thu, Sep 26, 2013 at 2:46 PM, Ron N VelocityXLFG
<velocityxl at fastmail.fm>wrote:

>
>
>
> 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 <velocityxl at fastmail.fm>
> *Sent:* Wednesday, September 25, 2013 10:37 PM
> *To:* Velocity Aircraft Owners and Builders list <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>
> Date: 09/25/2013 11:14 AM (GMT-06:00)
> To: Velocity Aircraft Owners and Builders list <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><velocityxl at fastmail.fm>
> Sent: Wednesday, September 25, 2013 9:36 AM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org><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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