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19th July 2008, 05:01 PM

"bill_hale@verigy.com" <33bonanza@> wrote

>He's right you know. Otherwise, small alternator induced voltage
>drops in the airframe will show up in series
>with the mic. You puny little wire won't change that picture.
>Isolation washers are the answer!!
>
>Should be on the phones too.

I agree with the above; however it depends on which bit of the
airframe the grounds of all the loads are returned to.

I fly a Socata TB20 and on that, everything is grounded to a common
point, close to the firewall. So there are no currents of any
significance flowing through the "passenger" portion of the airframe.

19th July 2008, 05:01 PM	#4 (permalink)
Peter Guest Posts: n/a Classified Rating: % ()	Alternator noise on Xmit only "bill_hale@verigy.com" <33bonanza@> wrote >He's right you know. Otherwise, small alternator induced voltage >drops in the airframe will show up in series >with the mic. You puny little wire won't change that picture. >Isolation washers are the answer!! > >Should be on the phones too. I agree with the above; however it depends on which bit of the airframe the grounds of all the loads are returned to. I fly a Socata TB20 and on that, everything is grounded to a common point, close to the firewall. So there are no currents of any significance flowing through the "passenger" portion of the airframe.