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Radio noise/interference

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bonanza(at)vodamail.co.za
Guest

Posted: Tue Aug 01, 2006 2:46 am Post subject: Radio noise/interference

Good day listers.  

   

I normally lurk on the Beech list but this query is far more suited to this forum!  

   

I fly a 1949 A35 Bonanza with an IO 470 engine and two Becker radios. I have had endless problems with interference.   

   

There is a loud “ticking” noise about 3 times per second when I hear someone else transmit. I have had the alternator overhauled,(suspected diode problem) the regulator changed, relocated the alternator wires inside the cockpit together with the relevant circuit breakers to the far left of the panel (radios on RHS), wired the radio power wire direct to the battery, rerouted the antenna wires and fitted a suppressor to the B terminal. There is also a wining noise audible as soon as the Alt Field is switched on, usually at low RPM. This corresponds with the flicking of the Ampmeter needle as the regulator cuts in and out.  

   

Any suggestions appreciated!  

Regards  

Bob Verwey  

A35 ZU-DLW

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brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Tue Aug 01, 2006 10:26 am Post subject: Radio noise/interference

On Aug 1, 2006, at 6:36 AM, Bob Verwey wrote:



 	  Quote: 	
		   There is a loud “ticking” noise about 3 times per second when I  

 hear someone else transmit.

It is hard to troubleshoot things we can't hear for ourselves. Here  
	


are some additional questions:



1. Does the ticking change with changes in the engine speed?



2. Does the ticking correspond to the flickering of your ammeter?



The whine may mean that you have one or more diodes out in the  

alternator but I suspect something else.



Do you have an intercom? When you unplug all your mics do the noises  

get less or disappear?



Brian Lloyd                         361 Catterline Way

brian-yak AT lloyd DOT com          Folsom, CA 95630

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

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