Re: OT For John T....

Posted by John T on November 23, 2008 at 17:02:40 from (66.244.97.31):

In Reply to: OT For John T.... posted by Dellbertt on November 23, 2008 at 09:48:29:

Dell, Im not up much on electronics or RFI as Jim probably, perhaps electronics gents like jdemaris and sound guy, maybe Bob or Jim can help, Im more of an old fashioned secondary AC Power Distribution kinda guy along with DC tractor electricity, but Ill toss out some thoughts.....

The more modern 3 wire household circuits can help some cuz the dedicated equipment grounding conductor would be bonded to any outer metallic cases (if any appliances have such a thing) but looks like youre stuck with the old 2 wire ungrounded.

Question:
What is the best solution to my interference problem?
1. Install numerous grounding points in the system.

I DO NOT think thats the answer or problem, you may get ground loop currents flowing which may make it worse. Besides, where you gonna bond any such "grounding points" ??? Mother earth, metallic pipes ??? Now if the TV or converter box etc has an outer metal case thay can act as a shield and even if they were tied to earth (driven rod) I guess that could help some, but a lot of electronics isnt inside any metal case nowadays

2. Install a television signal booster for each television.

I dont see that as much help either, you will just amplify the noise n static n interference, its the signal to noise ratio you gotta get down and if theres garbage in you still get garbage out. Of course if you had long runs to each TV with excess line loss that would help, but I think you have RFI about everywhere.

3. Install a high joule circuit filter for each television. If youre talking about a surge suppressor, I dont see that as the answer, thats just to bleed off any high sudden discharges to protect the equipment, not so much as a noise or static or suppression type of device, its more of a high energy spike reducer.

Things which may help, I gotta gree with Jim there. I HOPE ALLLLLLLLLLL TV CIRCUITRY IS COAXIAL CABLE because that (unlike 300 ohm flat twin lead) can redcue interference a bunch. That should be run from the antenna, to the box, to allllllll TV's.

Also as he mentioned, even thought you only have 2 wire home wiring, Id insure at the service entrance panel,,,,,,,or inside your meter base,,,,,,,or up on the weatherhead riser where power enters your house (different jurisdictions do this in diff places) the neutral is bonded to a grounding electrode conductor (like bare soft No 4 copper wire) which leads to a made grounding electrode such as a driven copper ground rod or metallic pipes etc.

Finally, the type of device you need (try Rat Shack) which may help is a noise suppressor/RFI/static/interference filter right there at the TV or box etc this is NOT THE SAME as a surge protector/supressor mind you, its for noise or static or RFI or interference etc

Another finally lol, if youre running multiple TV's and your incoming signal isnt all that stong to begin with, thats where one of those distribution amplifiers might help, it gets the antenna input n then has say 3 or 4 coax outlets
one for each TV. If that device had a noise/static/ filter and then you use coax out of it to each TV, I see that as more pretection then you currently have.

Much of this isnt all that expensive, a distribution amp and a few noise interference filters, because youre kinda stuck with that old 2 wire AC system......

John T Too Longggggggg retired EE not up much on RFI or TV stuff lol

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