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Help needed: continued strobe noise

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Mon Jul 17, 2006 3:48 am Post subject: Help needed: continued strobe noise

I'm not a sparky so I  can't contribute much to this, but I am in the process of wiring up my Rotax  912ULS and the Rotax wiring diagram calls for a 22,000 uF capacitor.   I bought one when I ordered the XCom radio ($40.00 U.S).  Haven't had the  opportunity to test it yet.

  

 Do Not  Archive

  

 Tommy Walker in  Alabama

  

  

 --> AeroElectric-List message posted by:  "europa flugzeug fabrik" <n3eu(at)comcast.net (n3eu(at)comcast.net)>

       

      

       luckymacy(at)comcast.net wrote:

      > BTW,  after I originally bought and installed the Xcom radio, they revised  their

      drawing and FAQ section to REQUIRE  owners install a 22,000 uF cap betwee the

      xcom  and it's power source near the radio.

       

      If Microair said that's a fix, they're  admitting to bad design of the XCOM box.

      At  high freq, diminishing returns, that big, I propose.  Simpler ways to  fix.

      

      Fred  F.

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_________________
Tommy Walker
N25A - Anniston, AL

wrmaxwell(at)bigpond.com
Guest

Posted: Mon Jul 17, 2006 4:15 am Post subject: Help needed: continued strobe noise

I think we have been here before, maybe more than  once.  As I recall, the capacitor is a Rotax requirement rather than a XCOM  stipulation.  XCOM now merely reflect that fact in their  drawing.

  

 Bill

 [quote]   ---

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nuckollsr(at)cox.net
Guest

Posted: Mon Jul 17, 2006 5:02 am Post subject: Help needed: continued strobe noise

At 09:00 PM 7/16/2006 -0700, you wrote:



 	  Quote: 	
		  

<n3eu(at)comcast.net>

luckymacy(at)comcast.net wrote:

 > BTW, after I originally bought and installed the Xcom radio, they 

 revised their drawing and FAQ section to REQUIRE owners install a 22,000 

 uF cap betwee the xcom and it's power source near the radio.



If Microair said that's a fix, they're admitting to bad design of the XCOM 

box.  At high freq, diminishing returns, that big, I propose.  Simpler 

ways to fix.


	


   I have written Xcom to inquire into the science behind the

   external capacitor's benefits but received no reply. I'm

   mystified as to the value or need. This is the first

   time I've seen the manufacturer of any appliance require

   power conditioning hardware be installed in addition to and

   external of their product.



   It does not speak well of the product's capabilities.

   I'll drop them another note and see if I can get their

   attention.



   Bob  . . .

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nuckollsr(at)cox.net
Guest

Posted: Mon Jul 17, 2006 11:54 am Post subject: Help needed: continued strobe noise

At 06:45 AM 7/17/2006 -0500, you wrote:



 	  Quote: 	
		  I'm not a sparky so I can't contribute much to this, but I am in the 

process of wiring up my Rotax 912ULS and the Rotax wiring diagram calls 

for a 22,000 uF capacitor.  I bought one when I ordered the XCom radio 

($40.00 U.S).  Haven't had the opportunity to test it yet.



Do Not Archive



Tommy Walker in Alabama


	




   The need for that capacitor is unique to PM alternators (low frequency,

   single phase ac) and is commonly found on all diagrams where

   PM alternators are wired. See Z-13/8, Z-16, Z-17, Z-20 and Z-25.

   This capacitor is conspicuous by its absence on wound field, three

   phase alternators used in other applications.



   I recall now having some conversation with either XCom or someone

   associated with them where the 22,000 uf cap callout was unique to

   PM alternator systems and only echos requirements already in place

   for those systems.



   If you don't have a PM alternator, you don't need the capacitor.



   Bob . . .

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