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andrewbutler(at)ireland.c
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 Posted: Mon Jun 29, 2009 12:58 am Post subject: Noise Problem |
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Hello All,
I hooked up my first headset yesterday. I have multiple audio sources mixed using an AMX-2A mixer from Vx Aviation feeding into a Flightcom 403 intercom. My 496 GPS told me when I turned off the power, my Traffic Watch that it was online and my EFIS told me voltage was low. My SL30 radio transmitted too, strength 5 and no noise! What a thrill the radio worked out of the box and all that spaghetti was actually functional!
One caveat. I could hear the inner workings of my AFS 3500 EFIS. Can anyone help me with identifying the usual suspects that may assist me in tracking down and eliminating the source of the noise?
Best regards,
Andrew Butler,
RV7 EI-EEO
Galway, Ireland.
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Mon Jun 29, 2009 7:31 am Post subject: Noise Problem |
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At 03:52 AM 6/29/2009, you wrote:
| Quote: |
<andrewbutler(at)ireland.com>
Hello All,
I hooked up my first headset yesterday. I have multiple audio
sources mixed using an AMX-2A mixer from Vx Aviation feeding into a
Flightcom 403 intercom. My 496 GPS told me when I turned off the
power, my Traffic Watch that it was online and my EFIS told me
voltage was low. My SL30 radio transmitted too, strength 5 and no
noise! What a thrill the radio worked out of the box and all that
spaghetti was actually functional!
One caveat. I could hear the inner workings of my AFS 3500 EFIS. Can
anyone help me with identifying the usual suspects that may assist
me in tracking down and eliminating the source of the noise?
|
Do you have a copy of the 'Connection? There's
an extensive chapter on noise mitigation that offers a
good start for your investigation
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
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ianxbrown
Joined: 16 May 2009
Posts: 80
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| Posted: Mon Jun 29, 2009 10:07 am Post subject: Noise Problem |
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Dr. Bob,
I also have a noise problem. I do indeed have a copy of the
"Connection" and have what you might have described as a "Really off the
wall problem". I wonder if you or any of your "listeners" would have a
clue.
My RV-9A has a Garmin GNX300 XL GPS/Com, a Narco AT165 transponder, a
Dynon EFIS D10A, and a Rocky Mountain enging micromonitor. The comms
are routed through a Flightcomm 403. The power distribution is through
an EXP2BUS.
In flight I get an irregular clankety-clank noise in both headsets that
sounds like someone whacking a rudder cable against the fuselage but
it's electrical. When I remove the headset and listen to the cabin
noise, all I hear is a louder engine noise.
It's all about the same pitch, but almost sounds almost like some form
of sparking or discharging.
There is no whining or other noise, and this seems to only happen when
the engine in running (i.e. most of the time). The sound reduces when I
turn down the volume, and goes away when I "isolate" the pilot from the
passenger on the Flightcomm 403 with the "ICS/Isolate" switch.
This is such a unique noise I just wondered if anyone else had heard it
or heard of it.
Thanks in advance for any of your wisdom.
Ian Brown,
Bromont
Quebec
Mon, 2009-06-29 at 10:29 -0500, Robert L. Nuckolls, III wrote:
| Quote: |
At 03:52 AM 6/29/2009, you wrote:
>
><andrewbutler(at)ireland.com>
>
>Hello All,
>
>I hooked up my first headset yesterday. I have multiple audio
>sources mixed using an AMX-2A mixer from Vx Aviation feeding into a
>Flightcom 403 intercom. My 496 GPS told me when I turned off the
>power, my Traffic Watch that it was online and my EFIS told me
>voltage was low. My SL30 radio transmitted too, strength 5 and no
>noise! What a thrill the radio worked out of the box and all that
>spaghetti was actually functional!
>
>One caveat. I could hear the inner workings of my AFS 3500 EFIS. Can
>anyone help me with identifying the usual suspects that may assist
>me in tracking down and eliminating the source of the noise?
Do you have a copy of the 'Connection? There's
an extensive chapter on noise mitigation that offers a
good start for your investigation
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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JohnInReno
Joined: 08 Sep 2007
Posts: 150
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| Posted: Mon Jun 29, 2009 4:13 pm Post subject: Noise Problem |
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I have a noise in the Flightcomm 403 intercom that I would describe as a
snare drum. It goes away when the squelch is adjusted.
John
Ian wrote:
| Quote: |
Dr. Bob,
I also have a noise problem. I do indeed have a copy of the
"Connection" and have what you might have described as a "Really off the
wall problem". I wonder if you or any of your "listeners" would have a
clue.
My RV-9A has a Garmin GNX300 XL GPS/Com, a Narco AT165 transponder, a
Dynon EFIS D10A, and a Rocky Mountain enging micromonitor. The comms
are routed through a Flightcomm 403. The power distribution is through
an EXP2BUS.
In flight I get an irregular clankety-clank noise in both headsets that
sounds like someone whacking a rudder cable against the fuselage but
it's electrical. When I remove the headset and listen to the cabin
noise, all I hear is a louder engine noise.
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale |
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Tue Jun 30, 2009 5:52 am Post subject: Noise Problem |
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| Quote: |
It's all about the same pitch, but almost sounds almost like some form
of sparking or discharging.
There is no whining or other noise, and this seems to only happen when
the engine in running (i.e. most of the time). The sound reduces when I
turn down the volume, and goes away when I "isolate" the pilot from the
passenger on the Flightcomm 403 with the "ICS/Isolate" switch.
This is such a unique noise I just wondered if anyone else had heard it
or heard of it.
Thanks in advance for any of your wisdom.
|
What is the repetition rate for the noise. How many
times per minute. Its it a regular rate or random?
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
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http://www.matronics.com/Navigator?AeroElectric-List |
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ianxbrown
Joined: 16 May 2009
Posts: 80
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| Posted: Tue Jun 30, 2009 7:46 am Post subject: Noise Problem |
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It's pretty random. It's about the pitch of metal on metal. It almost
sounds like someone is working in a workshop, throwing bits of scrap
aluminum around. Completely random, but of the order of about one a
second - certainly not a regular vibration type noise. Bursts of two or
three and then silence for a couple of seconds. Apparently someone else
has the same exact noise with the same behaviour on the Flightcom 403 in
intercom mode. He described is as a bit like a snare drum which give
you a feel for the pitch. It reduces with the squelch too.
I've also emailed Flightcom for help.
Regards,
Ian Brown
On Tue, 2009-06-30 at 00:36 -0500, Robert L. Nuckolls, III wrote:
| Quote: |
>
>It's all about the same pitch, but almost sounds almost like some form
>of sparking or discharging.
>
>There is no whining or other noise, and this seems to only happen when
>the engine in running (i.e. most of the time). The sound reduces when I
>turn down the volume, and goes away when I "isolate" the pilot from the
>passenger on the Flightcomm 403 with the "ICS/Isolate" switch.
>
>This is such a unique noise I just wondered if anyone else had heard it
>or heard of it.
>
>Thanks in advance for any of your wisdom.
What is the repetition rate for the noise. How many
times per minute. Its it a regular rate or random?
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Tue Jun 30, 2009 10:19 am Post subject: Noise Problem |
|
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At 10:37 AM 6/30/2009, you wrote:
| Quote: |
It's pretty random. It's about the pitch of metal on metal. It almost
sounds like someone is working in a workshop, throwing bits of scrap
aluminum around. Completely random, but of the order of about one a
second - certainly not a regular vibration type noise. Bursts of two or
three and then silence for a couple of seconds. Apparently someone else
has the same exact noise with the same behaviour on the Flightcom 403 in
intercom mode. He described is as a bit like a snare drum which give
you a feel for the pitch. It reduces with the squelch too.
|
Hmmm . . . beats me. Were the problem in my shop, I'd
have to break out the 'scope and signal tracer and start
poking around the innards of things.
Bob . . .
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mprather(at)spro.net
Guest
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| Posted: Tue Jun 30, 2009 3:26 pm Post subject: Noise Problem |
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Maybe it would only serve novelty purposes, but it would be interesting to
me to be able to hear these various sounds. Has anyone tried to record
anything like this? Share it on the web?
Regards,
Matt-
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 10:37 AM 6/30/2009, you wrote:
>
>
>It's pretty random. It's about the pitch of metal on metal. It almost
>sounds like someone is working in a workshop, throwing bits of scrap
>aluminum around. Completely random, but of the order of about one a
>second - certainly not a regular vibration type noise. Bursts of two or
>three and then silence for a couple of seconds. Apparently someone else
>has the same exact noise with the same behaviour on the Flightcom 403 in
>intercom mode. He described is as a bit like a snare drum which give
>you a feel for the pitch. It reduces with the squelch too.
Hmmm . . . beats me. Were the problem in my shop, I'd
have to break out the 'scope and signal tracer and start
poking around the innards of things.
Bob . . .
|
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ianxbrown
Joined: 16 May 2009
Posts: 80
|
| Posted: Sat Jul 11, 2009 9:57 am Post subject: Noise Problem |
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Matt and listers,
I'd be interested if anyone has a method to suggest for recording my
annoying intercom problem, or any other suggestions as to the cause.
The intercom is otherwise working just fine.
Ian Brown
On Tue, 2009-06-30 at 17:24 -0600, Matt Prather wrote:
| Quote: |
Maybe it would only serve novelty purposes, but it would be interesting to
me to be able to hear these various sounds. Has anyone tried to record
anything like this? Share it on the web?
Regards,
Matt-
>
> <nuckolls.bob(at)aeroelectric.com>
>
> At 10:37 AM 6/30/2009, you wrote:
>>
>>
>>It's pretty random. It's about the pitch of metal on metal. It almost
>>sounds like someone is working in a workshop, throwing bits of scrap
>>aluminum around. Completely random, but of the order of about one a
>>second - certainly not a regular vibration type noise. Bursts of two or
>>three and then silence for a couple of seconds. Apparently someone else
>>has the same exact noise with the same behaviour on the Flightcom 403 in
>>intercom mode. He described is as a bit like a snare drum which give
>>you a feel for the pitch. It reduces with the squelch too.
>
> Hmmm . . . beats me. Were the problem in my shop, I'd
> have to break out the 'scope and signal tracer and start
> poking around the innards of things.
>
> Bob . . .
>
>
>
>
>
>
|
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