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Tomi Holger Engdahl
Guest
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 Posted:
Wed Oct 12, 2005 8:35 am Post subject:
Re: due to some kind of interference, monitor display is "sh |
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"John H." <mistamaila@nospam.gmail.com> writes:
| Quote: | On Mon, 26 Sep 2005 16:59:56 +0300, Tomi Holger Engdahl wrote:
"John H." <mistamaila@nospam.gmail.com> writes:
ok, it's fixed! The TV Now now longer has a hum bar as well!
What I had to do was, for some odd reason
use a 3-2 prong converter for computer, and for monitors. The
bizarre thing is, if I do as they recommend and ground the bottom
of the converter into screw, the shaking comes back, so I cannot
do that.
There is nothing bizarre on that.
Your problem is related to ground connection. It is called
"ground loop".
When you disconnected the ground connection with a 3-2 prong converter,
the ground connection was cut and problem goes away. But do did
the electrical safety that the ground connection created.
When you added that " ground the bottom of the converter into screw",
you re-created the ground connection. No woders that shaking came back.
But does this present a fire hazard now, as the two do not seem to
be grounded?
The most danger with the missing ground connection is the electrocution!
So is that to say it is an electrical problem?
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The problem you have is an electrical problem in the nature.
The problem is within either the electrical distribution of
your house and/or how the cable TV is wired to your house.
| Quote: | if that is the
case, why did the electrician who came in and looked find no
such issue?:(
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Maybe this is where problem is with electricians and such:
Ground loops are a mystery to many people. Even college-trained
electronic engineers may not know what ground loops actually
are. Engineers have either concentrated on power distribution (for the
electric company) or on equipment that happens to plug in to the power
distribution system. Not much thought has been given to power
distribution, equipment and other connections to the equipment
as a single entity where ground loops arise.
You need a system approach top see this problem.
Understand the whole system.
It is very posible to have experts on different fields testing
the different parts of the system (all in their expertise field)
and make a reasonable judgement that all parts of the system
are OK and everyhting should work fine. But when everything is
connected toghether, there whole sysem does not work well.
And everybody can retest their systems separately and tell
that they are OK, and that the problem would be outside
their parts of system.
--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/
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Jasen Betts
Guest
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| Posted:
Thu Oct 13, 2005 2:18 pm Post subject:
Re: due to some kind of interference, monitor display is "sh |
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On 2005-10-12, John H. <mistamaila@nospam.gmail.com> wrote:
| Quote: | So is that to say it is an electrical problem? if that is the
case, why did the electrician who came in and looked find no
such issue?:(
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because it's not an electrical fault.
the best solution has been offered many times. make or buy an antenna
isolator.
Bye.
Jasen |
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John H.
Guest
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| Posted:
Sun Oct 16, 2005 8:35 am Post subject:
Re: due to some kind of interference, monitor display is "sh |
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On Thu, 13 Oct 2005 22:18:28 +1300, Jasen Betts wrote:
| Quote: | On 2005-10-12, John H. <mistamaila@nospam.gmail.com> wrote:
So is that to say it is an electrical problem? if that is the
case, why did the electrician who came in and looked find no
such issue?:(
because it's not an electrical fault.
the best solution has been offered many times. make or buy an antenna
isolator.
Bye.
Jasen
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Amazingly, as I mentioned on here several times, I did so, to no
avail.
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JosephKK
Guest
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| Posted:
Fri Nov 11, 2005 9:23 am Post subject:
Re: due to some kind of interference, monitor display is "sh |
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John H. wrote:
| Quote: | On Thu, 13 Oct 2005 22:18:28 +1300, Jasen Betts wrote:
On 2005-10-12, John H. <mistamaila@nospam.gmail.com> wrote:
So is that to say it is an electrical problem? if that is the
case, why did the electrician who came in and looked find no
such issue?:(
because it's not an electrical fault.
the best solution has been offered many times. make or buy an antenna
isolator.
Bye.
Jasen
Amazingly, as I mentioned on here several times, I did so, to no
avail.
I believe that you later said what you got at radio shack was a noise |
filter. Did you get an isolator afterwards? Did you report test results
for that? Please note that a correct isolator would have broken the ground
loop.
--
JosephKK |
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