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bob.verwey(at)gmail.com
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 Posted: Sun Mar 27, 2016 9:40 pm Post subject: fused or not...now keeping noise out..do caps work? |
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Bob,
In the same vein...
After having a new intercom fitted in my radio stack, I have developed a serious amount of radio noise as soon as the rpm's hit the 2000 mark. The sq button has no effect on the severity of this noise. It is as if a source is transmitting to the radio!
I am told that adding a 22000 microfarad cap across the power feed to the radios will solve this problem.
What says the brains trust?
On 27 March 2016 at 19:39, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 07:33 AM 3/27/2016, you wrote:
| Quote: | thanks guys for the info. i am told it is to keep noise out of the ecu.
 bob noffs |
That IS the legacy rationale for adding such things
and it's a deeply rooted idea did
a failure analysis on a modern, 100A alternator
that came equipped from the factory with a 680uF
electrolytic capacitor mounted right to the back
of the alternator.
[img]cid:7.1.0.9.0.20160327122948.0099ede8(at)aeroelectric.com.0[/img]
I am quite certain that noise from this alternator on
EMC laboratory equipment would not be materially
reduced for having added the capacitor. I'd
LOVE to see an EMC test report that illuminates
the 'benefit'.
I just purchased a spectrum analyzer that sweeps
down to 1Hz and up to 2.4 Ghz. When I begin
development testing on the next generation of
PM alternator rectifier/regulators for B&C I will
quantify the value of adding this component
to our airplanes.
Bob . . .
|
--
Best...Bob Verwey
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rulmen
Joined: 06 Jul 2013
Posts: 3
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| Posted: Mon Mar 28, 2016 5:27 am Post subject: fused or not...now keeping noise out..do caps work? |
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Is that the actual size of the capacitor for that application?
Rich Ulmen
On Mar 28, 2016, at 1:38 AM, Bob Verwey <bob.verwey(at)gmail.com (bob.verwey(at)gmail.com)> wrote:
| Quote: | Bob,
In the same vein...
After having a new intercom fitted in my radio stack, I have developed a serious amount of radio noise as soon as the rpm's hit the 2000 mark. The sq button has no effect on the severity of this noise. It is as if a source is transmitting to the radio!
I am told that adding a 22000 microfarad cap across the power feed to the radios will solve this problem.
What says the brains trust?
On 27 March 2016 at 19:39, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 07:33 AM 3/27/2016, you wrote:
| Quote: | thanks guys for the info. i am told it is to keep noise out of the ecu.
 bob noffs |
That IS the legacy rationale for adding such things
and it's a deeply rooted idea did
a failure analysis on a modern, 100A alternator
that came equipped from the factory with a 680uF
electrolytic capacitor mounted right to the back
of the alternator.
<15a1d98e.jpg>
I am quite certain that noise from this alternator on
EMC laboratory equipment would not be materially
reduced for having added the capacitor. I'd
LOVE to see an EMC test report that illuminates
the 'benefit'.
I just purchased a spectrum analyzer that sweeps
down to 1Hz and up to 2.4 Ghz. When I begin
development testing on the next generation of
PM alternator rectifier/regulators for B&C I will
quantify the value of adding this component
to our airplanes.
Bob . . .
|
--
Best...Bob Verwey
|
| | - 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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_________________
RULMEN |
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bob.verwey(at)gmail.com
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| Posted: Mon Mar 28, 2016 8:30 am Post subject: fused or not...now keeping noise out..do caps work? |
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Rich, this is what was recommended by the avionics shop
On Monday, March 28, 2016, <rich.ulmen(at)gmail.com (rich.ulmen(at)gmail.com)> wrote:
| Quote: | Is that the actual size of the capacitor for that application?
Rich Ulmen
On Mar 28, 2016, at 1:38 AM, Bob Verwey <[url=javascript:_e(%7B%7D,'cvml','bob.verwey(at)gmail.com');]bob.verwey(at)gmail.com[/url]> wrote:
| Quote: | Bob,
In the same vein...
After having a new intercom fitted in my radio stack, I have developed a serious amount of radio noise as soon as the rpm's hit the 2000 mark. The sq button has no effect on the severity of this noise. It is as if a source is transmitting to the radio!
I am told that adding a 22000 microfarad cap across the power feed to the radios will solve this problem.
What says the brains trust?
On 27 March 2016 at 19:39, Robert L. Nuckolls, III <[url=javascript:_e(%7B%7D,'cvml','nuckolls.bob(at)aeroelectric.com');]nuckolls.bob(at)aeroelectric.com[/url]> wrote:
| Quote: | At 07:33 AM 3/27/2016, you wrote:
| Quote: | thanks guys for the info. i am told it is to keep noise out of the ecu.
 bob noffs |
That IS the legacy rationale for adding such things
and it's a deeply rooted idea did
a failure analysis on a modern, 100A alternator
that came equipped from the factory with a 680uF
electrolytic capacitor mounted right to the back
of the alternator.
<15a1d98e.jpg>
I am quite certain that noise from this alternator on
EMC laboratory equipment would not be materially
reduced for having added the capacitor. I'd
LOVE to see an EMC test report that illuminates
the 'benefit'.
I just purchased a spectrum analyzer that sweeps
down to 1Hz and up to 2.4 Ghz. When I begin
development testing on the next generation of
PM alternator rectifier/regulators for B&C I will
quantify the value of adding this component
to our airplanes.
Bob . . .
|
--
Best...Bob Verwey
|
|
--
Best...Bob Verwey
| | - 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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