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faulty push to talk

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nuckolls.bob(at)aeroelect
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Posted: Tue Dec 28, 2010 6:45 pm Post subject: faulty push to talk

At 05:39 PM 12/28/2010, you wrote:

 	  Quote: 	
		  hi all,

   my friend bought a kitfox and when the ptt button is pressed the 

 rotax tach. goes to far right and so does the gas gauge. the 

 intercom and radio all continue to work normally. any hints where 

 he should look first? he isolated the power to the ptt by jumping 

 at the battery but no change.


	


    Does it do it with the radio turned off? This has the

    flavor of an RF interference problem. You need to

    dummy load the transceiver's antenna line . . .



http://aeroelectric.com/Pictures/Tools/RF_Antenna_Test_Tools/DummyLoad.jpg



    and see if the problem goes away. Are these perchance

    Van's instruments? I've had two of them in my shop,

    an ammeter and a fuel gauge as I recall. Both were

    extraordinarily vulnerable to strong RF in the

    cockpit.

   Bob . . .

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