Ground Hum & Ground Loop Isolators - Page 4 - Blu-ray Forum

mtbdudexdad · 11-26-2013, 01:28 AM

My practical advice to people....make sure you truly grasp your ground path.
I had this problem, the cable people did a crappy job with grounding using cheap clamp, it had I think a bi-metallic corrosion going also as well. (wiggly clamp)

Before showing cable install job:

.

I took the clamp off, went to HD, bought 6' copper wire, attached to inside home copper pipe, actually next to where the 200A main also had a ground wire attached.
Copper wire going into basement shown:

.

To make matters a little more complicated, my outside faucets are "isolated" and not really connected to my inside pipes, due to my whole home EcoSmarte system, which uses various plastic/assy stuf for flowmeters, electrodes, etc.
So I connected a jumper wire from my inside pipes to my outside pipes, just to have them on the same ground plane.
This pict shows my whole home H20 system, kinda complicated but great H20 for whole home.

I also made sure the OTA antenna ground plane was same datum.
Here is in construction phase showing the home 2 ground rods.

Here is the OTA antenna being correctly grounded to the red circled one, it is visible just past hot tub cement pad.
I added this wire as part of solution.

Showing OTA copper wire on LH going around the corner under deck, while the antenna lighting rod is grounded next to the elect meters.
Now all on same ground plane datum.

.

So, when solving ground loop issues you have to totally trace/follow your elect system and cable/sat/OTA/etc ground points.

For me, no more ground loop issue.
Maybe $12 max.

Fractoggen123 · 08-12-2020, 06:08 AM

Great post, a lot of stuff in here i did not know about

benji888578 · 05-01-2022, 06:56 AM

My question is, why does my AVR only have a 2-prong plug? Considering the abundance of hum issues that could result, shouldn't they be grounding the AVR system??

So, I put a wire in the wall for the sub, but, only speaker wire, no shielding. Here's the very odd thing. I have two HDMI monitor outputs on my AVR. To one is my projector. The projector has a grounded plug. The other is a TV, but, used to be a UHD computer monitor, which had a grounded plug. The new TV has only a 2-prong plug.

Sometime after I changed to the TV I had a very bad hum, I think it came up when I unplugged the projector because I was taking it down for a while. I'd had the projector unplugged before, but, no hum... oh, I know what it was, sometimes the projector will not spin up the fan when I go from eco to bright mode and it does a fan lock out and shuts down, have to unplug to reset. The first time I had to do this after switching from the monitor to the TV I heard the very loud hum!

Plug in the projector and the hum goes away.

The only thing I could figure out is that the monitor with the 3-prong plug and the projector with the 3 prong plug, somehow ground the system through the HDMI cable. (unplug the HDMI cable and get the same results). The hum was always only muffled, not completely gone.

I solved it by getting a well shielded coax cable and ran it from the AVR to the sub directly. (zero hum).

Anyway, so, this makes me wonder why the AVR itself is not grounded??

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11-26-2013, 01:28 AM	#61
mtbdudexdad Active Member Member since:Nov 2013	My practical advice to people....make sure you truly grasp your ground path. I had this problem, the cable people did a crappy job with grounding using cheap clamp, it had I think a bi-metallic corrosion going also as well. (wiggly clamp) Before showing cable install job: . I took the clamp off, went to HD, bought 6' copper wire, attached to inside home copper pipe, actually next to where the 200A main also had a ground wire attached. Copper wire going into basement shown: . To make matters a little more complicated, my outside faucets are "isolated" and not really connected to my inside pipes, due to my whole home EcoSmarte system, which uses various plastic/assy stuf for flowmeters, electrodes, etc. So I connected a jumper wire from my inside pipes to my outside pipes, just to have them on the same ground plane. This pict shows my whole home H20 system, kinda complicated but great H20 for whole home. I also made sure the OTA antenna ground plane was same datum. Here is in construction phase showing the home 2 ground rods. Here is the OTA antenna being correctly grounded to the red circled one, it is visible just past hot tub cement pad. I added this wire as part of solution. Showing OTA copper wire on LH going around the corner under deck, while the antenna lighting rod is grounded next to the elect meters. Now all on same ground plane datum. . So, when solving ground loop issues you have to totally trace/follow your elect system and cable/sat/OTA/etc ground points. For me, no more ground loop issue. Maybe $12 max.

08-12-2020, 06:08 AM	#62
Fractoggen123 New Member Member since:Mar 2019 Location:UK	Great post, a lot of stuff in here i did not know about

05-01-2022, 06:56 AM	#63
benji888578 Special Member Top contributor Member since:Aug 2013 Location:USA 4K collection:131 Blu-ray collection:1573 DVD collection:56 iTunes collection:36 Blu-ray reviews: 1 Trading Score:22	My question is, why does my AVR only have a 2-prong plug? Considering the abundance of hum issues that could result, shouldn't they be grounding the AVR system?? So, I put a wire in the wall for the sub, but, only speaker wire, no shielding. Here's the very odd thing. I have two HDMI monitor outputs on my AVR. To one is my projector. The projector has a grounded plug. The other is a TV, but, used to be a UHD computer monitor, which had a grounded plug. The new TV has only a 2-prong plug. Sometime after I changed to the TV I had a very bad hum, I think it came up when I unplugged the projector because I was taking it down for a while. I'd had the projector unplugged before, but, no hum... oh, I know what it was, sometimes the projector will not spin up the fan when I go from eco to bright mode and it does a fan lock out and shuts down, have to unplug to reset. The first time I had to do this after switching from the monitor to the TV I heard the very loud hum! Plug in the projector and the hum goes away. The only thing I could figure out is that the monitor with the 3-prong plug and the projector with the 3 prong plug, somehow ground the system through the HDMI cable. (unplug the HDMI cable and get the same results). The hum was always only muffled, not completely gone. I solved it by getting a well shielded coax cable and ran it from the AVR to the sub directly. (zero hum). Anyway, so, this makes me wonder why the AVR itself is not grounded??

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