Today's Message Index:
----------------------
1. 08:05 AM - Re: Diagnosing generator problems (Robert L. Nuckolls, III)
2. 11:42 AM - Radio noise when transmitting (Mark)
3. 12:29 PM - Re: Diagnosing generator problems (Randy C-GRPY)
4. 04:26 PM - Re: Radio noise when transmitting (user9253)
5. 07:08 PM - Re: Radio noise when transmitting (markdonahue)
6. 07:32 PM - Dewa's Game (agen slot online terpercaya - dewaasia) (dewaslot99)
Message 1
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| Subject: | Re: Diagnosing generator problems |
At 09:27 PM 3/14/2020, you wrote:
>
>I have a friend with a 1946 Swift that is having
>generator issues. It isn=99t charging the
>battery. Are there some easy checks that can be
>done to try and narrow down the search for the
>issue ie: voltage regulator vs generator etc?
>
>Any feedback would be appreciated.
How long has it been that the generator was
functioning normally? If it has been idle
for an extended period of time, the generator
may have lost its residual magnetism which
will require 'flashing' to recover.
If the generator has been working and simply
died, then peek at the brushes. Are they recessed
deep in their holders . . . half way down or
more? Probably worn out. If brush length isn't
a obvious possibility, then it gets more
complicated.
Generators are not difficult to troubleshoot
but it takes some tools, and knowledge of the
generator style (F terminal pull up to
bus or down to ground for full output).
The process requires that the engine be
running during certain measurements.
It can be done without pulling parts
but it's not a trivial exercise. One
of the easiest tests is to simply substitute
a known good regulator first. But pulling
both devices off for bench tests as a
working pair is the definitive process.
I could ask you for voltage measurements
while the engine is running and the system
turned ON . . . but without knowing more
details on the system's inner-workings,
external measurements would be meaningless.
There are tools that would let us deduce
system details and ultimately diagnose
the failure but explaining their
acquisition and use here on the List
is problematic. Sorry I can't be more
helpful.
Bob . . .
Message 2
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| Subject: | Radio noise when transmitting |
I have an RV 9A aircraft with a 60 amp Plane Power alternator and an Icom
IC-200 radio. I recently installed ADSB (echo UAT/FYX-EXT) with associated
antennae at recommended spacing on the plane's belly. My recent symptoms
are a high whine in the headset when transmitting on the radio. I hear
incoming radio transmissions clearly. I checked disconnecting the
alternator by opening the field circuit breaker and the sound during
transmitting goes away.
This issue may be more noticeable while on the ground. When announcing
"ready for take-off" I get a response from fellow pilots in the pattern that
they hear a high whine in the transmission. However when at 3000 ft
altitude and 5 miles from the field during a radio check, the sound in my
head set is diminished and the response from fellow pilots is "loud and
clear". The fact that this occurred after the ADSB installation may be
unrelated. I don't remember this problem immediately after that
installation, so this may be a canard. Any advice on how to trouble shoot
this and recommended fixes that I could attempt.
Thanks to this group. I enjoy and appreciate the knowledge and experience
of the members.
Mark Donahue
206 755 1093
Message 3
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| Subject: | Re: Diagnosing generator problems |
nuckolls.bob(at)aeroelect wrote:
> At 09:27 PM 3/14/2020, you wrote:
>
> >
> > I have a friend with a 1946 Swift that is having generator issues. It isnt
charging the battery. Are there some easy checks that can be done to try and
narrow down the search for the issue ie: voltage regulator vs generator etc?
> >
> > Any feedback would be appreciated.
>
> How long has it been that the generator was
> functioning normally? If it has been idle
> for an extended period of time, the generator
> may have lost its residual magnetism which
> will require 'flashing' to recover.
>
> If the generator has been working and simply
> died, then peek at the brushes. Are they recessed
> deep in their holders . . . half way down or
> more? Probably worn out. If brush length isn't
> a obvious possibility, then it gets more
> complicated.
>
> Generators are not difficult to troubleshoot
> but it takes some tools, and knowledge of the
> generator style (F terminal pull up to
> bus or down to ground for full output).
> The process requires that the engine be
> running during certain measurements.
>
> It can be done without pulling parts
> but it's not a trivial exercise. One
> of the easiest tests is to simply substitute
> a known good regulator first. But pulling
> both devices off for bench tests as a
> working pair is the definitive process.
>
> I could ask you for voltage measurements
> while the engine is running and the system
> turned ON . . . but without knowing more
> details on the system's inner-workings,
> external measurements would be meaningless.
>
> There are tools that would let us deduce
> system details and ultimately diagnose
> the failure but explaining their
> acquisition and use here on the List
> is problematic. Sorry I can't be more
> helpful.
>
>
>
> Bob . . .
Thanks Bob.
The plane has been flying and up until recently all was well. Failure was sudden.
There are about 100 hrs on this particular unit. The brushes looked fine.
>From your response Im getting that its going to take somebody with experience
to troubleshoot effectively. I will pass that on.
Regards
Randy
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Message 4
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| Subject: | Re: Radio noise when transmitting |
Make sure that the microphone jacks are electrically insulated from the airframe
with dielectric washers. The mic ground wire should be grounded at the radio end
only.
--------
Joe Gores
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Message 5
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| Subject: | Re: Radio noise when transmitting |
I spoke to Allen @ Hartsell (owner of Plane Power now) and he thought it could
well be a bad diode on the alternator. Suggested testing between the alternator
output to ground with a volt meter set to AC voltage. If I get something closer
to 1 volt, as opposed to say .08 volt, then that would show a bad diode.
Also suggested checking the grounds. I plan to do that. Thanks for the suggestion
on the headphone jacks isolation washers. I will check that also.
Mark
--------
Mark Donahue
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Message 6
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