Today's Message Index:
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1. 01:27 PM - Engine noise in Radio and Headset (Hugh McKay)
2. 06:41 PM - Re: Engine noise in Radio and Headset (Larry Edson)
Message 1
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| Subject: | Engine noise in Radio and Headset |
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 =9Cnoise=9D 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
=9Cnoise=9D?
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@bellsouth.net
Allegro 2000 E-LSA N661WW
Rotax 912 UL 689 hours
Message 2
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| 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/capac
itor-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@bellsouth.net> wrote:
>
> 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 =9C
noise=9D in my head sets when I use the radio push-to-talk transmit bu
tton. 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 engi
ne rpm, especially at low rpms. At higher rpms the noise is not as bad but i
t is still there as noise. The voltage regulator is wired per the Rotax engi
ne wiring diagram with the addition of two 10,000 Mf capacitors in parallel.
>
> Can anyone give me advice as to how to eliminate this =9Cnoise
=9D?
>
> 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@bellsouth.net
> Allegro 2000 E-LSA N661WW
> Rotax 912 UL 689 hours
>
> <Hugh.vcf>
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