Hearing the alternator

[Michael 182]

When I turn on the alternator in my '79 TR-182 I hear a faint highpitched
squeal through the headsets. No squeal when I just run on battery. Is there
a simple way to fix this?

TIA,

Michael

[Michael 182]

All right, I did some Google searching (sorry - I should have started there)
and now suspect that my problem is in the grounding. But where in the
system? Can I fix this, or is it back to the avionics shop?

Thanks,

Michael


"Michael 182" > wrote in message
news:JkvTb.163152$sv6.893167@attbi_s52...
> When I turn on the alternator in my '79 TR-182 I hear a faint highpitched
> squeal through the headsets. No squeal when I just run on battery. Is
there
> a simple way to fix this?
>
> TIA,
>
> Michael
>
>

[G.R. Patterson III]

Michael 182 wrote:
>
> All right, I did some Google searching (sorry - I should have started there)
> and now suspect that my problem is in the grounding. But where in the
> system? Can I fix this, or is it back to the avionics shop?

One thing you can do yourself is to isolate the jacks. Buy special fiber washers
that have a double-thickness cylinder in the center. Remove each jack from the
panel, re-drill or ream the hole in the panel to fit the center section of the
isolation washer, and re-install the jack with a plain fiber washer in the front.
The two fiber washers keep any metal parts of the jack from touching the airframe,
so the only way the jack is grounded is the ground wire to the intercom.

George Patterson
Love, n.: A form of temporary insanity afflicting the young. It is curable
either by marriage or by removal of the afflicted from the circumstances
under which he incurred the condition. It is sometimes fatal, but more
often to the physician than to the patient.

[mikem]

A convert!

MikeM

G.R. Patterson III wrote:


> One thing you can do yourself is to isolate the jacks. Buy special fiber washers
> that have a double-thickness cylinder in the center. Remove each jack from the
> panel, re-drill or ream the hole in the panel to fit the center section of the
> isolation washer, and re-install the jack with a plain fiber washer in the front.
> The two fiber washers keep any metal parts of the jack from touching the airframe,
> so the only way the jack is grounded is the ground wire to the intercom.

[Michael 182]

"G.R. Patterson III" > wrote in message
...
>
>
> Michael 182 wrote:
> >
> > All right, I did some Google searching (sorry - I should have started
there)
> > and now suspect that my problem is in the grounding. But where in the
> > system? Can I fix this, or is it back to the avionics shop?
>
> One thing you can do yourself is to isolate the jacks. Buy special fiber
washers
> that have a double-thickness cylinder in the center. Remove each jack from
the
> panel, re-drill or ream the hole in the panel to fit the center section of
the
> isolation washer, and re-install the jack with a plain fiber washer in the
front.
> The two fiber washers keep any metal parts of the jack from touching the
airframe,
> so the only way the jack is grounded is the ground wire to the intercom.

Hate to be dense (not that I have a choice) but does the "double-thickness
cylinder in the center" mean something like a grommet?

Something like this?

http://www.marcorubber.com/grommets_commercial.htm

Thanks,

Michael



>
> George Patterson
> Love, n.: A form of temporary insanity afflicting the young. It is
curable
> either by marriage or by removal of the afflicted from the
circumstances
> under which he incurred the condition. It is sometimes fatal, but
more
> often to the physician than to the patient.

[Tom Pappano]

Michael 182 wrote:
> "G.R. Patterson III" > wrote in message
> ...
>
>>
>>Michael 182 wrote:
>>
>>>All right, I did some Google searching (sorry - I should have started
>
> there)
>
>>>and now suspect that my problem is in the grounding. But where in the
>>>system? Can I fix this, or is it back to the avionics shop?
>>
>>One thing you can do yourself is to isolate the jacks. Buy special fiber
>
> washers
>
>>that have a double-thickness cylinder in the center. Remove each jack from
>
> the
>
>>panel, re-drill or ream the hole in the panel to fit the center section of
>
> the
>
>>isolation washer, and re-install the jack with a plain fiber washer in the
>
> front.
>
>>The two fiber washers keep any metal parts of the jack from touching the
>
> airframe,
>
>>so the only way the jack is grounded is the ground wire to the intercom.
>
>
> Hate to be dense (not that I have a choice) but does the "double-thickness
> cylinder in the center" mean something like a grommet?
>
> Something like this?
>
> http://www.marcorubber.com/grommets_commercial.htm
>
> Thanks,
>
> Michael
>
>
>
>
>>George Patterson
>> Love, n.: A form of temporary insanity afflicting the young. It is
>
> curable
>
>> either by marriage or by removal of the afflicted from the
>
> circumstances
>
>> under which he incurred the condition. It is sometimes fatal, but
>
> more
>
>> often to the physician than to the patient.
>
>
>

They are called "shoulder washers", usally made of fiber or nylon.

Tom Pappano, PP-ASEL-IA

[Michael 182]

"Tom Pappano" > wrote in message
y.com...
>
> They are called "shoulder washers", usally made of fiber or nylon.
>
> Tom Pappano, PP-ASEL-IA
>

Got it. Thanks,

Michael

[G.R. Patterson III]

Michael 182 wrote:
>
> Hate to be dense (not that I have a choice) but does the "double-thickness
> cylinder in the center" mean something like a grommet?

Something like one side of a grommet. When used in conjunction with the mating
flat washer, the two washers essentially form a grommet. IIRC, I bought the washers
for the jacks in my aircraft at a local electronics store, but I may have had to
order them.

George Patterson
Love, n.: A form of temporary insanity afflicting the young. It is curable
either by marriage or by removal of the afflicted from the circumstances
under which he incurred the condition. It is sometimes fatal, but more
often to the physician than to the patient.

[Paul Sengupta]

I have a UK military headset plugged into a flying lead which comes
from the back of the centre console.

I have the whine, though it's not very noticeable until the alternator
is switched off and it goes away and you then notice its absence.

Paul

"G.R. Patterson III" > wrote in message
...
> One thing you can do yourself is to isolate the jacks.