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#1
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Cable TV = Horrible Hum in Stereo
I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? |
#2
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
In article ,
lid says... I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? Typical ground loop hum. One solution is to get a ground isolator for the cable line. There are others - search for cable ground loop: http://www.google.com/search?hl=en&q...able+gro und+ whosbest54 -- The flamewars are over...if you want it. Unofficial rec.audio.opinion Usenet Group Brief User Guide: http://www.geocities.com/whosbest54/ Unofficial rec.music.beatles Usenet Group Brief User Guide: http://www.geocities.com/whosbest54/rmb.html |
#3
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
whosbest54 wrote: lid says... I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? Typical ground loop hum. Agreed. Happens all the time. Graham |
#4
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
On Sep 14, 12:17*pm, Eeyore
wrote: whosbest54 wrote: says... I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. *I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? Typical ground loop hum. Agreed. Happens all the time. Graham ________________ Here's what I did to eliminate it. First of all, it helps to have a properly grounded receptacle within 4 feet of the cable jack on the wall. 1. Buy some 18 or 16AWG stranded wire from a Radio Shack(remember, we're grounding a coax signal line here - not a washing machine.) 2. Cut a piece slightly longer than the distance between the receptacle & the cable jack. 3. Strip 2" from the end going around the back side of the cable jack plate between it and the washers holding the jack to the plate. 4. Strip 1" from the end going aroud the screw holding the receptacle plate to the receptacle. 5. I think you can figure out how to get the wire around both items - the female/female cable bridge at one end and the receptacle plate screw on the other. 6. Remount the cable jack & plate to the wall. In my case - hum gone, tighter bass, clearer sound overall, especially on my HT system. Let me know how this works for you. -ChrisCoaster |
#5
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
On Sun, 14 Sep 2008 14:27:48 GMT, dizzy wrote:
I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? Get (2) 75 to 300 Ohm baluns and tie them back to back. Pancake |
#6
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
Quick and dirty, get one of those cheap 3 prong to 2 prong plug adapters and
use it on your satellite receiver. You probably have a huge ground loop because of the satellite being grounded. "dizzy" wrote in message ... I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? |
#7
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
Pancake wrote:
On Sun, 14 Sep 2008 14:27:48 GMT, dizzy wrote: I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Anyone have experience with a good solution? Get (2) 75 to 300 Ohm baluns and tie them back to back. Pancake Won't work ... the grounds are tied together internally in the commercial baluns. It would work if they were not so tied, but so would a plain bifilar transformer. Doug McDonald |
#8
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
"jamesgangnc" wrote ...
Quick and dirty, get one of those cheap 3 prong to 2 prong plug adapters and use it on your satellite receiver. You probably have a huge ground loop because of the satellite being grounded. The ground loop is caused by the ground on the *cable*, not the ground on the receiver. Lifting the local safety ground on the receiver ("cable box") is a potentially dangerous "solution". People have reported well over 50VAC potential on the cable shield, and that is safely grounded by the cable box green-wire ground connection. The solution is to break the hard ground connection on the cable itself by using an isolation transformer. The problem is caused by the practice of grounding the cable system back hundreds or thousands of feet upstream, but with no "local" reference to ground. |
#9
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
Richard Crowley wrote:
"jamesgangnc" wrote ... Quick and dirty, get one of those cheap 3 prong to 2 prong plug adapters and use it on your satellite receiver. You probably have a huge ground loop because of the satellite being grounded. The ground loop is caused by the ground on the *cable*, not the ground on the receiver. Lifting the local safety ground on the receiver ("cable box") is a potentially dangerous "solution". People have reported well over 50VAC potential on the cable shield, and that is safely grounded by the cable box green-wire ground connection. The solution is to break the hard ground connection on the cable itself by using an isolation transformer. The problem is caused by the practice of grounding the cable system back hundreds or thousands of feet upstream, but with no "local" reference to ground. I had this problem and finally solved it by using a DC isolated cable connection. I got two female F jacks and connected the center pins together with one .001 microfarad tiny size chip capacitor and the grounds of the two jacks together through 6 somewhat larger 150 pf chip capacitors equally spaced around the circumference; I soldered them to some sheet copper held on by two nuts. This was put between the cable and the box using an extra one foot long cable. Doug McDonald |
#10
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
ChrisCoaster wrote:
Here's what I did to eliminate it. First of all, it helps to have a properly grounded receptacle within 4 feet of the cable jack on the wall. 1. Buy some 18 or 16AWG stranded wire from a Radio Shack(remember, we're grounding a coax signal line here - not a washing machine.) 2. Cut a piece slightly longer than the distance between the receptacle & the cable jack. 3. Strip 2" from the end going around the back side of the cable jack plate between it and the washers holding the jack to the plate. 4. Strip 1" from the end going aroud the screw holding the receptacle plate to the receptacle. 5. I think you can figure out how to get the wire around both items - the female/female cable bridge at one end and the receptacle plate screw on the other. 6. Remount the cable jack & plate to the wall. In my case - hum gone, tighter bass, clearer sound overall, especially on my HT system. Let me know how this works for you. So... Just short-out ground-loop, in other words. Preliminary experiment (sticking one end of the wire into the Ground hole of the outlet and pressing the other against the outside of the cable's connector) showed a massive reduction in hum, but there's still some noise getting through - some higher-frequency, buzzy junk. I think I may do your trick *and* buy an isolation transformer. |
#11
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
"dizzy" wrote ...
So... Just short-out ground-loop, in other words. Preliminary experiment (sticking one end of the wire into the Ground hole of the outlet and pressing the other against the outside of the cable's connector) showed a massive reduction in hum, but there's still some noise getting through - some higher-frequency, buzzy junk. I think I may do your trick *and* buy an isolation transformer. If the ground loop is bad enough, you may find a way of tapping into that "free" power. It may be enough to power the cable box! :-) |
#12
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
On Mon, 15 Sep 2008 06:57:00 -0700, "Richard Crowley"
wrote: The ground loop is caused by the ground on the *cable*, not the ground on the receiver. Lifting the local safety ground on the receiver ("cable box") is a potentially dangerous "solution". People have reported well over 50VAC potential on the cable shield, and that is safely grounded by the cable box green-wire ground connection. The solution is to break the hard ground connection on the cable itself by using an isolation transformer. The problem is caused by the practice of grounding the cable system back hundreds or thousands of feet upstream, but with no "local" reference to ground. To the OP: please listen to Richard's advice. Never lift a safety ground, *especially* when a better solution is available easily. There have been two good solutions to your problem already posted: 1) break the cable's ground path with an isolation device - several kinds are available. 2) minimize the length of the ground loop by locally connecting cable ground to Edison safety ground. Both work and both are safe for your family. The second option is also built into most "lightning protection" widgets that include cable protection. Their cable ground is hard-wired to their Edison ground. All the best fortune, Chris Hornbeck |
#13
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
On Sep 15, 8:38*pm, "Richard Crowley" wrote:
"dizzy" *wrote ... So... *Just short-out ground-loop, in other words. Preliminary experiment (sticking one end of the wire into the Ground hole of the outlet and pressing the other against the outside of the cable's connector) showed a massive reduction in hum, but there's still some noise getting through - some higher-frequency, buzzy junk. I think I may do your trick *and* buy an isolation transformer. If the ground loop is bad enough, you may find a way of tapping into that "free" power. It may be enough to power the cable box! :-) ________________ Or that flux-capacitor you've been hangin onto since the 80s! |
#14
Posted to rec.audio.tech
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Cable TV = Horrible Hum in Stereo
dizzy writes:
I switched from satellite to cable, and that cable going into the back of the TV has introduced a terrible hum into my stereo/surround system. I have to pull the cable from the TV when I want to listen to music! Sounds like a typical ground loop problem: Ground loop problems and how to get rid of them http://www.epanorama.net/documents/g...oop/index.html Anyone have experience with a good solution? Installing an isolator to antenna conenction will solve the problem well http://www.epanorama.net/documents/g..._isolator.html -- 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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