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Alternator Radio Noise

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alaskajim(at)cox.net
Guest

Posted: Sun Jan 13, 2008 5:23 pm Post subject: Alternator Radio Noise

I have a late model Jabiru 3300 engine which is producing a loud

alternator whine through my Val Com 760 radio. I've researched the

archives and have tried a 22000uf, computer grade (nut terminals)

capacitor but it's made little difference. I connected the positive

terminal of the capacitor to the same place my feed wires (red &

yellow) from the regulator attach to the positive battery terminal on

my starter contactor. I ran the negative to ground. Very little

difference. The noise is so loud it very annoying. I can disconnect

the red & yellow wires from the hot side of the starter contactor and

it is dead quiet so am pretty sure the whine (increases in pitch with

rpm) is from the alternator.



I am out of ideas. What am I missing (other that a good radio)? Is

there another radio noise filter that I should be using?



Has anyone tried the SMOOTHIE BRICKWALL

NOISE FILTER from Spruce?

http://www.aircraftspruce.com/catalog/elpages/smoothieFilter2.php

amyvega2005(at)earthlink.
Guest

Posted: Mon Jan 14, 2008 5:37 am Post subject: Alternator Radio Noise

James,

did you speak with Pete at Jabiru USA?



Juan



--

lrm(at)skyhawg.com
Guest

Posted: Mon Jan 14, 2008 6:50 am Post subject: Alternator Radio Noise

Hey Jim, go to Radio Shack and get a noise suppresser.  Put it on the power 

input as close as possible to the radio.  Fixed mine.

 LRM www.skyhawg.com.

---

Jess
Guest

Posted: Mon Jan 14, 2008 6:56 am Post subject: Alternator Radio Noise

If you folks go to a good boat parts supply house and check out Newmar Noise Filters, they are 10 amps and will cover most electronics, very reasonable.

Start the year off right.  Easy ways to stay in shape in the new year. 

  [quote][b]

alaskajim(at)cox.net
Guest

Posted: Mon Jan 14, 2008 7:58 am Post subject: Alternator Radio Noise

I called Pete first.  He has been very attentive but said this isn't  

a problem area for Jabiru aircraft and is unfamiliar with what to  

suggest.  Another person suggested a radio filter.  He said it worked  

for him with the same radio.  I going to try to run my radio with  

another battery I have as a spare with a direct hookup and see what  

happens.   Thanks for the response.  Jim

s the radio picking up



On Jan 14, 2008, at 6:36 AM, Juan Vega wrote:



[quote] 

 <amyvega2005(at)earthlink.net>



 James,

 did you speak with Pete at Jabiru USA?



 Juan



 --

alaskajim(at)cox.net
Guest

Posted: Mon Jan 14, 2008 8:18 am Post subject: Alternator Radio Noise

Thanks Larry.     Mark Sherman sent me this information.  Thought I  

would post it for the list:



I did some looking at Radio Shacks web site and found

that they have discontinued the noise filter 270-051

with no replacement part.



I found the same part at Parts Express

(www.partsexpress.com) under the part number 265-042.



On Jan 14, 2008, at 7:46 AM, LRM wrote:



[quote] 



 Hey Jim, go to Radio Shack and get a noise suppresser.  Put it on  

 the power input as close as possible to the radio.  Fixed mine.

 LRM www.skyhawg.com.

 ---

amyvega2005(at)earthlink.
Guest

Posted: Mon Jan 14, 2008 8:31 am Post subject: Alternator Radio Noise

I took my plane to Sarasota avionics to see what the experts say.  By the way Sarasota avionics is a great shop if you need someone FAA certified to look at the plane,  They are like Zenithair,  fantastic customer service.  Since I know enough to be very dangerous on electronics, they wired my plane up when I built it.  What they have found is that the noise is an egnition noise from the two white wires leading from the alternator.  I am going to look at the niose suppressors you guys recommend since we are all tending to see this problem.  

It is interesting Pete at Jabiru took that stance on the noise, a "not my problem" stance.  If some one has a solution or even a band aid, it would benefit for him to mention it. 



Juan



--

notsew_evets(at)frontiern
Guest

Posted: Mon Jan 14, 2008 8:52 am Post subject: Alternator Radio Noise

I have the 3300 but have not run it yet.  I did have a 2200 on another 

airplane and it also had the noise.

After much research and talking to HAM operators, the suggestion was to be 

sure the wires are the insulated (grounded shield) type.  I rewired the 

whole instrument panel and had the noise still.  Then, one day a radio 

expert told me to ground only one end of the shield on the wires.  I did. 

It solved my radio noise completely.  Apparently if the shielded wire is 

grounded on both ends you create a "loop" and the radio picks up the noise 

just as it does with a non shielded wire.

On my new 3300 I ve run shielded wires EVERYWHERE..  Hopping I dont get the 

problem...



Steve W

---

tjs22t(at)verizon.net
Guest

Posted: Mon Jan 14, 2008 9:31 am Post subject: Alternator Radio Noise

Apparently if the shielded wire is 

grounded on both ends you create a  "loop" and the radio picks up the noise 

just as it does with a non shielded  wire.

  

 This is why Pete will tell you to  ground the carby to the engine or a common ground (make sure engine is  grounded).  The cables running to carby for throttle and choke (starting  circuit) can act as loops as the carby is mounted on a rubber  tube/sleeve.

  

 Might not solve everyones problem  but worth a try.

  

 cheers  jeff    HDS/3300

 



    [quote][b]

gfmjr_20(at)HOTMAIL.COM
Guest

Posted: Mon Jan 14, 2008 9:37 am Post subject: Alternator Radio Noise

Juan--

   Before you try suppressors, you might want to try and shield the white wires.  Even some aluminum foil wrapped around them will help identify specifically if this is the issue. If it is the answers ,permanent shielding is available.

  

 George May

 601XL 912s



[quote] Date: Mon, 14 Jan 2008 11:31:02 -0500

 From: amyvega2005(at)earthlink.net

 To: zenith-list(at)matronics.com; zenith-list(at)matronics.com

 Subject: Re: Alternator Radio Noise

 

 --> Zenith-List message posted by: Juan Vega <amyvega2005(at)earthlink.net>

 

 I took my plane to Sarasota avionics to see what the experts say. By the way Sarasota avionics is a great shop if you need someone FAA certified to look at the plane, They are like Zenithair, fantastic customer service. Since I know enough to be very dangerous on electronics, they wired my plane up when I built it. What they have found is that the noise is an egnition noise from the two white wires leading from the alternator. I am going to look at the niose suppressors you guys recommend since we are all tending to see this problem. 

 It is interesting Pete at Jabiru took that stance on the noise, a "not my problem" stance. If some one has a solution or even a band aid, it would benefit for him to mention it. 

 

 Juan

 

 --

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