Re: Axiom ground isolater
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Joined: Feb 2008
Posts: 859
aficionado
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aficionado
Joined: Feb 2008
Posts: 859 |
No more humming at Wid's house. Glad to hear that you got things fixed Rick.
M80's(2), VP150, QS8's(2), M3's(4)
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Re: Axiom ground isolater
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
Very good, Rick. Sure, it wasn't that there was something defective about the cable ground that could be corrected by changing it, but that the voltage potential beween that ground and the other ground in your system was big enough to cause a current to flow and cause hum/interference. The isolator cut the hum signal without affecting the TV signals.
Incidentally, Dr. Horse mentions a point that seems rather curious, since the claimed 1.5 GHz bandwidth would be adequate for the down-converted satellite signals. Wonder if a problem really would exist.
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Enjoy the music, not the equipment.
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Re: Axiom ground isolater
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Joined: Jan 2002
Posts: 3,270
connoisseur
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connoisseur
Joined: Jan 2002
Posts: 3,270 |
Hi JohnK,
The bandwidth isn't the problem with satellite signals. It's that the satellite receiver sends a voltage to the dish antenna to power the feedhorn for the dish. Axiom's ground isolator would interfere with the phantom powering of the dish's pickup.
Kind of like phantom powering of some microphones from the mike preamp in studio and remote recording.
Regards,
Alan
Alan Lofft, Axiom Resident Expert (Retired)
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Re: Axiom ground isolater
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
Thanks for the explanation, Alan. I wondered why Axiom might be limiting the sales of their excellent isolator if it could in fact pass the roughly 1 GHz incoming satellite signals. A less obvious problem, but one that still makes it unsuitable.
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Enjoy the music, not the equipment.
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Re: Axiom ground isolater
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Joined: Feb 2009
Posts: 562
aficionado
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aficionado
Joined: Feb 2009
Posts: 562 |
Humming and ground bars scrolling through the tv. I called Comcast about the problem ... I ended up ordering the Axiom ground isolator. It came in today and within minutes the humming and ground bars were eliminated from the set.
It's well worth the money to get rid of that dreaded hum. Thanks again Axiom.
I have a hum I recently noticed from my bedroom SD Comcast DVR box(Pace TDC577X). I imagine the DVR has a spinning disk, but funny thing is it hums when it is OFF too. Probably totally unrelated to your issue, but since you guys were talking about humming, it reminded me of my hum.
Dave
"In theory, practice and theory are the same. In practice they're not."
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Re: Axiom ground isolater
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Joined: Jan 2002
Posts: 3,270
connoisseur
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connoisseur
Joined: Jan 2002
Posts: 3,270 |
Dave,
If you mean the whirring of the DVR's hard drive, no, that never shuts off when you turn off the DVR, only if you unplugged the unit.
If it's a ground-loop hum you are hearing through the speakers or subwoofer or the TV's speakers which is caused by the cable-TV input, that too will continue whether the DVR is on or off. That would disappear if you turned off the TV, subwoofer or AV receiver, which amplify the ground-loop.
Regards,
Alan
Alan Lofft, Axiom Resident Expert (Retired)
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Re: Axiom ground isolater
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Joined: Feb 2009
Posts: 3,466
connoisseur
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connoisseur
Joined: Feb 2009
Posts: 3,466 |
I have a hum I recently noticed from my bedroom SD Comcast DVR box(Pace TDC577X). I imagine the DVR has a spinning disk, but funny thing is it hums when it is OFF too. Probably totally unrelated to your issue, but since you guys were talking about humming, it reminded me of my hum. DVRs are notorious for spinning their disks even when "off" (standby). They can't really be off, because they need to power themselves up in order to make scheduled recordings, and also to update their guide information.
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
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