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Posted by on November 7, 2009, 8:47 pm
On Fri, 6 Nov 2009 11:30:45 -0800 (PST), jamesgangnc
>On Nov 6, 2:04 pm, gfretw...@aol.com wrote:
>> wrote:
>> >I have a garage that is fed with a 3 wire feed from one pole transformer and
>> >my house is same from a different pole transformer. Both locations have a
>> >ground rod attached to the box. The cable TV is connected to both sites
>> >using a splitter. ( This was installed by the cable company before I bought
>> >the house) Is this a possible ground problem? The cable eventually connects
>> >the shield to the ground of each television in both locations. Saw a similar
>> >post the other day that got me thinking.....
>> >Roanin
>> EA has the right answer, bond the ground electrode systems together.
>> When I was in the computer business we fixed a lot of problems this
>> way when networks spanned several buildings. A lightning strike will
>> resolve this ground shift through your TV if you don't.
>That won't fix ground loop hum in audio.
Did the OP say he had an audio hum problem? I missed that part.
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Posted by Existential Angst on November 6, 2009, 6:30 pm
> wrote:
>>I have a garage that is fed with a 3 wire feed from one pole transformer
>>and
>>my house is same from a different pole transformer. Both locations have a
>>ground rod attached to the box. The cable TV is connected to both sites
>>using a splitter. ( This was installed by the cable company before I
>>bought
>>the house) Is this a possible ground problem? The cable eventually
>>connects
>>the shield to the ground of each television in both locations. Saw a
>>similar
>>post the other day that got me thinking.....
>>Roanin
> EA has the right answer, bond the ground electrode systems together.
Do I get a prize???
--
EA
> When I was in the computer business we fixed a lot of problems this
> way when networks spanned several buildings. A lightning strike will
> resolve this ground shift through your TV if you don't.
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Posted by Tony on November 6, 2009, 7:20 pm
ROANIN wrote:
> I have a garage that is fed with a 3 wire feed from one pole transformer and
> my house is same from a different pole transformer. Both locations have a
> ground rod attached to the box. The cable TV is connected to both sites
> using a splitter. ( This was installed by the cable company before I bought
> the house) Is this a possible ground problem? The cable eventually connects
> the shield to the ground of each television in both locations. Saw a similar
> post the other day that got me thinking.....
Like was posted, if you have a hum you probably have a ground loop, if
not hum, don't worry about it. I worked on a friends entertainment
center for hours before finding that if, and only if the center bass
speaker for surround sound and the cable tv was hooked up, he would get
a real bad hum. I forget how I fixed it?
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Posted by ROANIN on November 7, 2009, 9:17 am
> ROANIN wrote:
>> I have a garage that is fed with a 3 wire feed from one pole transformer
>> and my house is same from a different pole transformer. Both locations
>> have a ground rod attached to the box. The cable TV is connected to both
>> sites using a splitter. ( This was installed by the cable company before
>> I bought the house) Is this a possible ground problem? The cable
>> eventually connects the shield to the ground of each television in both
>> locations. Saw a similar post the other day that got me thinking.....
> Like was posted, if you have a hum you probably have a ground loop, if not
> hum, don't worry about it. I worked on a friends entertainment center for
> hours before finding that if, and only if the center bass speaker for
> surround sound and the cable tv was hooked up, he would get a real bad
> hum. I forget how I fixed it?
OK thanks for the replies. I have no problems right at the moment, was just
wanting to make sure it was safe. The ground rods are about 200 feet apart
FYI.
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Posted by JIMMIE on November 7, 2009, 10:12 pm
> I have a garage that is fed with a 3 wire feed from one pole transformer =
and
> my house is same from a different pole transformer. Both locations have a
> ground rod attached to the box. =A0The cable TV is connected to both site=
s
> using a splitter. ( This was installed by the cable company before I boug=
ht
> the house) Is this a possible ground problem? The cable eventually connec=
ts
> the shield to the ground of each television in both locations. Saw a simi=
lar
> post the other day that got me thinking.....
> Roanin
Stuff happens and this arrangement may makes stuff somewhat more
likely to happen.
A house may last your lifetime and never need the ground connection
that was provided for it. What happens if one day that ground is
called upon to do its duty and the only path it has is through your TV
set, cable box cable modem and various other equipment out in the
garage. For audio there are isolation transformers commercially
available made to handle the situation you describe. I dont know if
there is anything available to isolate a cable TV signal
commercially.Perhaps googling TV isolation transformer may return
something.
Jimmie
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