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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Tue Mar 31, 2015 12:27 pm Post subject: Engine noise in Radio and Headset |
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I have an Allegro 2000 E-LSA with a Rotax 912 UL engine using the standard Rotax Voltage regulator. After 600 +/- hours I am getting a lot of “noise” in my head sets when I use the radio push-to-talk transmit button. The radio is an ICOM IC-A200 VHF Transceiver using a Comant CI 121 VHF Antenna. When using the P-T button to transmit I can actually hear the engine rpm, especially at low rpms. At higher rpms the noise is not as bad but it is still there as noise. The voltage regulator is wired per the Rotax engine wiring diagram with the addition of two 10,000 Mf capacitors in parallel.
Can anyone give me advice as to how to eliminate this “noise”?
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net
Allegro 2000 E-LSA N661WW
Rotax 912 UL 689 hours
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ledson
Joined: 29 Apr 2009
Posts: 62
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| Posted: Tue Mar 31, 2015 5:41 pm Post subject: Engine noise in Radio and Headset |
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Hugh,
I would check the noise canceling capacitors. They do fail with exposure to heat and humidity and they are not hard to check.
The following document will help you to understand the various failure modes of the different types of capacitors.
http://www.electrocube.com/electrocube/assets/File/documentation-files/capacitor-documents/electrocube-tech-bulletin-why-capacitors-fail.pdf
Good luck,
Larry Edson
N4362C
Sent from my iPad
On Mar 31, 2015, at 4:26 PM, Hugh McKay <hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)> wrote:
[quote] I have an Allegro 2000 E-LSA with a Rotax 912 UL engine using the standard Rotax Voltage regulator. After 600 +/- hours I am getting a lot of “noise” in my head sets when I use the radio push-to-talk transmit button. The radio is an ICOM IC-A200 VHF Transceiver using a Comant CI 121 VHF Antenna. When using the P-T button to transmit I can actually hear the engine rpm, especially at low rpms. At higher rpms the noise is not as bad but it is still there as noise. The voltage regulator is wired per the Rotax engine wiring diagram with the addition of two 10,000 Mf capacitors in parallel.
Can anyone give me advice as to how to eliminate this “noise”?
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)
Allegro 2000 E-LSA N661WW
Rotax 912 UL 689 hours
<Hugh.vcf>
[b]
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brian.davies(at)clara.co.
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| Posted: Wed Apr 01, 2015 12:34 am Post subject: Engine noise in Radio and Headset |
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Also worth checking all the earth connections, including the aerial for corrosion, not just visually. Undo and clean all connections. Particularly, check the regulator earth.
Regards
Brian Davies
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of Larry Edson
Sent: 01 April 2015 02:41
To: rotaxengines-list(at)matronics.com
Subject: Re: Engine noise in Radio and Headset
Hugh,
I would check the noise canceling capacitors. They do fail with exposure to heat and humidity and they are not hard to check.
The following document will help you to understand the various failure modes of the different types of capacitors.
http://www.electrocube.com/electrocube/assets/File/documentation-files/capacitor-documents/electrocube-tech-bulletin-why-capacitors-fail.pdf
Good luck,
Larry Edson
N4362C
Sent from my iPad
On Mar 31, 2015, at 4:26 PM, Hugh McKay <hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)> wrote:
| Quote: |
I have an Allegro 2000 E-LSA with a Rotax 912 UL engine using the standard Rotax Voltage regulator. After 600 +/- hours I am getting a lot of “noise” in my head sets when I use the radio push-to-talk transmit button. The radio is an ICOM IC-A200 VHF Transceiver using a Comant CI 121 VHF Antenna. When using the P-T button to transmit I can actually hear the engine rpm, especially at low rpms. At higher rpms the noise is not as bad but it is still there as noise. The voltage regulator is wired per the Rotax engine wiring diagram with the addition of two 10,000 Mf capacitors in parallel.
Can anyone give me advice as to how to eliminate this “noise”?
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)
Allegro 2000 E-LSA N661WW
Rotax 912 UL 689 hours
<Hugh.vcf>
http://www.matronics.com/Navigator?RotaxEngines-List |
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