REFLECTOR: Intercom question

Clayton Chase chasec at gmail.com
Mon Feb 18 15:05:36 CST 2013


How bad is it to have a loop in the ground circuit?    I wouldn't think
it's a big problem as long as all ground paths are solid and can handle the
current.

JOKE ->  I tried looking up 'ground loop aviation' on google but got a
whole bunch of stuff unrelated to electrical systems.


On Mon, Feb 18, 2013 at 12:53 PM, Laurence Coen <lwcoen at hotmail.com> wrote:

> **
> There is no mention of what kind of airplane your friend has.  The way to
> wire the audio is different for a metal plane than a glass plane.  In a
> metal plane, mounting the jack will ground it to the airframe and if you
> connect the shield at that point there will be two ground paths (ground
> loop).  With a glass plane the ground return can be via the shield since
> the jack is not grounded to the airframe. See the attached.
>
> Larry Coen
> N136LC
>
>  *From:* Matt Bucko <mbuc310 at cox.net>
> *Sent:* Sunday, February 17, 2013 10:53 PM
> *To:* Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> *Subject:* Re: REFLECTOR: Intercom question
>
> Thank you.
> Bucko
> On 2/17/2013 9:05 PM, Glenn Falkenberg wrote:
>
> To float the shield means to not terminate it at the component or a
> ground.  Usually the shield is trimmed back a couple of inches and shrink
> sleeved or a solder sleeved.
> On Feb 17, 2013 6:37 PM, "Matt Bucko" <mbuc310 at cox.net> wrote:
>
>> Would you please describe "float the shield at the jack".
>>
>> Bucko
>> On 2/17/2013 7:04 PM, Scott Derrick wrote:
>>
>> agreed
>>
>> Glenn Falkenberg <airmech2 at gmail.com> <airmech2 at gmail.com> wrote:
>>
>> I think the best way would be use a shielded twisted pair.  Float the
>> shield at the Jack and take shield to ground at intercom panel.
>> On Feb 17, 2013 4:25 PM, "Dan Schindler" <danpilot91 at gmail.com> wrote:
>>
>>> My friends airplane intercom is wired in such a way that each jack only
>>> has 1 wire running to it. Utilizing the shielded portion of the wire as the
>>> common ground. Is this an acceptable way to do this. He is getting feedback
>>> in his headset when he pushes the PTT.
>>>
>>> Thank you,
>>>
>>> Dan Schindler
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>>
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>
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