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VHF Interference With Wing Leveler

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chasb(at)satx.rr.com
Guest

Posted: Tue Oct 23, 2012 8:17 am Post subject: VHF Interference With Wing Leveler

I have a NavAid Wing leveler installed in my RV. Works as advertised  

-  most of the time. When I transmit on the radio (Apollo SL-60,) I  

get a strong right turn input. The input ceases immediately and the  

wings are abruptly leveled when the transmission stops. The radio  

antenna is directly below the NavAid servo. The wires to the servo are  

shielded. Is there any way to filter the interference?



By the way, the NavAid company is now defunct and not available for  

support.



Charlie Brame

RV-6A, N11CB

San Antonio

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Oct 23, 2012 9:45 am Post subject: VHF Interference With Wing Leveler

At 11:16 AM 10/23/2012, you wrote:




I have a NavAid Wing leveler installed in my RV. Works as advertised

-  most of the time. When I transmit on the radio (Apollo SL-60,) I

get a strong right turn input. The input ceases immediately and the

wings are abruptly leveled when the transmission stops. The radio

antenna is directly below the NavAid servo. The wires to the servo are

shielded. Is there any way to filter the interference?



By the way, the NavAid company is now defunct and not available for

support.



    I had some discussions with the original owner/designer

    over this same issue about 15 years ago at OSH. He was

    reluctant/unable to rise to the design goal of making

    sure his product would perform as advertised in airplanes

    with transmitters on board.



    Shielded wire is of little if any value in fixing

    an RFI issue. Filtering wires as they enter a shielded

    environment on the potential antagonist or victim is

    the time honored approach . . .



    I don't recall when . . . or even if it happend on

    this List . . . there was some discussion that I

    think resulted in a successful 'fix'. Does

    anyone else on the List recall?



    Do you have schematics for the black-boxes?



    Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Oct 23, 2012 10:32 am Post subject: VHF Interference With Wing Leveler

At 12:44 PM 10/23/2012, you wrote:


<nuckolls.bob(at)aeroelectric.com>



At 11:16 AM 10/23/2012, you wrote:




I have a NavAid Wing leveler installed in my RV. Works as advertised

-  most of the time. When I transmit on the radio (Apollo SL-60,) I

get a strong right turn input. The input ceases immediately and the

wings are abruptly leveled when the transmission stops. The radio

antenna is directly below the NavAid servo. The wires to the servo are

shielded. Is there any way to filter the interference?



By the way, the NavAid company is now defunct and not available for

support.



    I had some discussions with the original owner/designer

    over this same issue about 15 years ago at OSH. He was

    reluctant/unable to rise to the design goal of making

    sure his product would perform as advertised in airplanes

    with transmitters on board.



    Shielded wire is of little if any value in fixing

    an RFI issue. Filtering wires as they enter a shielded

    environment on the potential antagonist or victim is

    the time honored approach . . .



    I don't recall when . . . or even if it happend on

    this List . . . there was some discussion that I

    think resulted in a successful 'fix'. Does

    anyone else on the List recall?



    Do you have schematics for the black-boxes?

   P.S. ===============================================



   Text on page 11 of the installation manual found at



http://tinyurl.com/9xh5l6r



   describes the function of a diode added to the PTT line

   for a transmitter shown on page 9. This apparently serves

   to 'lock up' the servo during transmit intervals thus preventing

   the otherwise vulnerable servo from reacting to strong RF.

   Bob . . .

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jdubner

Joined: 17 Jul 2012
Posts: 35
Location: Independence, OR

Posted: Tue Oct 23, 2012 10:37 am Post subject: VHF Interference With Wing Leveler

Charlie,



The NavAid wing leveler installation instructions show an optional diode and 

connection to the com radio PTT.  With them the A/P is disabled while the PTT is 

depressed, allowing it to "do nothing" in the event of RFI.



NavAid manuals are available here:

http://www.porcine.com/gps/sc/ftp_manuals.html



--

Joe

Independence, OR

http://www.mail2600.com/cgi-bin/position.cgi?call=N821RP

Charles Brame wrote:

 	  Quote: 	
		   

 

 I have a NavAid Wing leveler installed in my RV. Works as advertised -  

 most of the time. When I transmit on the radio (Apollo SL-60,) I get a 

 strong right turn input. The input ceases immediately and the wings are 

 abruptly leveled when the transmission stops. The radio antenna is 

 directly below the NavAid servo. The wires to the servo are shielded. Is 

 there any way to filter the interference?

 

 By the way, the NavAid company is now defunct and not available for 

 support.

 

 Charlie Brame

 RV-6A, N11CB

 San Antonio

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_________________
Independence, OR

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