nuckolls.bob(at)aeroelect
Guest
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 Posted: Tue Dec 09, 2008 2:33 pm Post subject: More debugging of alternator whine problem |
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At 12:04 PM 12/9/2008, you wrote:
| Quote: | I have continued the testing of the electrical system on my 601XL in
attempts to reduce or eliminate the alternator whine. No luck
yet. Here is what I have done so far:
[1] Ran radio off an isolated battery. No noise.
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Okay, this suggests that the noise is coming in through
the power line. A filter is called for. What kind of radio
are we talking about? How much current does it draw in
receive and transmit?
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[2] Disconnected shield ground for headset wires. Noise persists.
[3] Disconnected power for headsets which runs along side the audio
wires. (Thought this was a good candidate!) Noise persists.
Additional notes:
[4] Whine increases significantly in volume when adding
power. Implies it is power related, not ground loop, yes?
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Not necessarily but when you did the isolated battery
test, that eliminated all other root causes.
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[5] Noted that some Z-diagrams for permanent magnet setups show
alternator control relay between alternator and regulator, and some
show this between regulator and bus. Mine is the latter. Any
reason to suspect this?
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No
| Quote: |
[6] Noted that for installation diagram of motorcycle voltage
regulator, they show it connected directly to the battery. In my
plane, the voltage regulator feeds the primary buss separately from
the batteries. That is, there are two power feeds to the buss. Any
chance that moving the connection from the regulator directly to the
battery and removing the "extra" buss feed would have any effect?
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Try it.
If you have a test filter identified, you're on
the right track. I have another filter that MIGHT
be suited to your task if you'd like to give it
a try it would be interesting to know . . .
Bob . . .
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