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Mechanical noise cancellation experiment

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aslsa.rng(at)gmail.com
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Posted: Tue Nov 04, 2008 6:40 pm Post subject: Mechanical noise cancellation experiment

Bob, I've been thinking of ways to overcome the noise issues we encountered while flying the trike this summer and came to the conclusion that some sort of mechanical cover might help. I have searched the housewares aisle at various box stores and wandered Ace Aircraft Supply looking for inspiration. The other night I had an Aha! moment. The picture shows the result. I held the terminal boots in my closed hand to warm them up before I tried to slide them over the headset mic and the boom joint. I used a bamboo skewer with a rounded end to gently pry and stretch the opening when it wanted to catch on the screw head at the swivel. After they were on I cut some thin porous foam to make a muff over the mic element and pushed it in the boot and around the mic with the skewer. This afternoon Lou and I went out in the back yard and did a test to see how well the idea worked. The wind was blowing at almost flight speed for the trike and the results were very good. It took very little squelch to knock down what little noise came through and the wind did not activate the mic at all. I don't know how well it will work with the ambient noise in the trike with the engine behind us, but the first pass test seems promising.

 



Rick

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nuckolls.bob(at)cox.net
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Posted: Mon Nov 10, 2008 10:44 am Post subject: Mechanical noise cancellation experiment

At 08:29 PM 11/4/2008 -0600, you wrote:

 	  Quote: 	
		  Bob, I've been thinking of ways to overcome the noise issues we 

encountered while flying the trike this summer and came to the conclusion 

that some sort of mechanical cover might help. I have searched the 

housewares aisle at various box stores and wandered Ace Aircraft Supply 

looking for inspiration. The other night I had an Aha! moment. The picture 

shows the result. I held the terminal boots in my closed hand to warm them 

up before I tried to slide them over the headset mic and the boom joint. I 

used a bamboo skewer with a rounded end to gently pry and stretch the 

opening when it wanted to catch on the screw head at the swivel. After 

they were on I cut some thin porous foam to make a muff over the mic 

element and pushed it in the boot and around the mic with the skewer.

This afternoon Lou and I went out in the back yard and did a test to see 

how well the idea worked. The wind was blowing at almost flight speed for 

the trike and the results were very good. It took very little squelch to 

knock down what little noise came through and the wind did not activate 

the mic at all. I don't know how well it will work with the ambient noise 

in the trike with the engine behind us, but the first pass test seems 

promising.


	


   Cool idea. Let me know how it works out in practice!

        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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