REFLECTOR: Fwd: Re: Noise in the Cockpit
Ron N VelocityXLFG
velocityxl at fastmail.fm
Thu Sep 26 15:11:16 CDT 2013
3 others .
On 9/26/2013 3:00 PM, Don Johnston wrote:
> >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 <mailto: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 <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>
>> <mailto:velocityxl at fastmail.fm>
>> Sent: Wednesday, September 25, 2013 9:36 AM
>> To: "Velocity Aircraft Owners and Builders list"
>> <reflector at tvbf.org> <mailto: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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>
>
>
>
> _______________________________________________
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