Today I went again flying since it was one of these postcard like FL
days. Wanted to test if I still had the static like noise in the
headset after takeoff. I had installed capacitors on the prop wires
as suggested. On runup and taxi there was no noise. After takeoff it
came back. Made it to the ocean and turned back since the ATC was
getting bad transmissions from me.
Had a head scratching session with an electronics engineer and more
or less we zeroed on the alternator. Here is the scoop:
1 On taxi and runup 3,500 rpm before and after landing there is no noise
2 Activating the prop pitch switch on the Ivo stops the noise when
pressed
3 I'm receiving ATC transmissions very clear
4 Looks like the noise appears around 5-6,500 rpm

My alternator is from '86-88 RX7 just rebuilt. Noticed that once I
activate the alt. field switch, the output comes up as it should. But
later even if I turn it off, it does not affect the output. Looks
like the alternator feeds the field after that?
Couple of people suggested that the built-in regulator may be gone bad?
Any comments?
Buly



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