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RFI problem

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kesleyelectric(at)chooseb
Guest

Posted: Fri Nov 28, 2008 4:23 pm Post subject: RFI problem

Bob and all,  

   

I recently upgraded the lighting in the shop where my airplane is under construction from the 20+ year old, 8 foot fluorescent fixtures to the newer, more energy efficient type with electronic ballasts.  The light is much better, and that irritating audible hum that the old lights made is gone.  However, all radio reception and the lower TV channels are gone too, now nothing but static.  Both the radio and TV are connected to an outside antenna via RG6 coax.  Someone at an electronics store suggested that replacing the existing coax with RG6 Quad Shield in from the antenna would solve the problem.  I am not familiar with this product.  Any thoughts?  I rather miss having the radio on while working on the plane.  

   

Regards,  

   

Tom Barter  

Kesley,  IA  

Avid Magnum - wiring  

       [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Fri Nov 28, 2008 5:27 pm Post subject: RFI problem

At 06:19 PM 11/28/2008, you wrote:

 	  Quote: 	
		  Bob and all,



I recently upgraded the lighting in the shop where my airplane is 

under construction from the 20+ year old, 8 foot fluorescent 

fixtures to the newer, more energy efficient type with electronic 

ballasts.  The light is much better, and that irritating audible hum 

that the old lights made is gone.  However, all radio reception and 

the lower TV channels are gone too, now nothing but static.  Both 

the radio and TV are connected to an outside antenna via RG6 

coax.  Someone at an electronics store suggested that replacing the 

existing coax with RG6 Quad Shield in from the antenna would solve 

the problem.  I am not familiar with this product.  Any thoughts?  I 

rather miss having the radio on while working on the plane.



Regards,




	


    My best guess is that the ballasts were not filtered

    to control the effects of radiation from the tubes.

    I've heard of this before. The 8' tubes make really

    good antennas for radiating the noise. Additional

    shielding of the feedline to your radios is unlikely

    to make any difference. Try a hand-held AM/FM radio

    and see how far you have to move away from the lights

    to get unaffected reception.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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kesleyelectric(at)chooseb
Guest

Posted: Sat Nov 29, 2008 8:16 am Post subject: RFI problem

Bob,



I need to get 5-10 feet outside of the building before the reception clears

up.



Tom Barter

--

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nuckolls.bob(at)cox.net
Guest

Posted: Sun Nov 30, 2008 9:01 am Post subject: RFI problem

At 10:13 AM 11/29/2008, you wrote:

 	  Quote: 	
		  

<kesleyelectric(at)chooseblue.coop>



Bob,



I need to get 5-10 feet outside of the building before the reception clears

up.


	


    Hmmm . . . assuming it's a metal building, it seems

    likely that the noise is radiating directly into

    the radio through the enclosure. You stated that the

    antenna was outside and would therefore expect to

    see a similar benefit of shielding or distance

    attenuation.



    If you have several fixtures, it's probably easier

    to find a radio that is more resistant to local

    noises than to figure out how to filter/shield

    the lamps.



    As a final experiment, can you pull the antenna

    coax outside and then operated the radio outside

    the building while connected to the antenna coax?

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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