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Trane furnace radio/TV interference
Mark wrote:
Hi, Then, shielding, choking, bypassing with caps come to mind. It's all by trial and error. O'scope may come in handy. Well that's my concern. There are more and more of these kinds of units being installed everyday. We can't "home brew" a fix for all of them. Someone needs to get to the FCC or to the manufacterer to fix this at the source before it gets worse. Mark Yup, EMI pollution! |
Trane furnace radio/TV interference
"Dave" wrote in message . .. snip As you describe your setup it does meet USA National Electrical Code. Your home should have ONLY one earth connection, not two! /s/ DD I don't know about that! I had some work done which involved an upgraded service entrance and new breaker panel. The electrician added a second ground via a ground stake beneath the panel, despite the original (1967) ground via the cold water inlet pipe being intact and sound. (I will concede that he didn't quote chapter and verse in the NEC; he may have been following a local code requirement. I know he wasn't padding the bill, as he was doing the job at the behest of my son, from whose business he was buying his supplies. (Still does.) "Sal" |
Trane furnace radio/TV interference
Motors with brushes are "incidental radiators" according to the FCC. I
believe PWM or variable frequency drive motors would be considered "unintentional radiators" in that they intentionally generate a radio frequency (9 kHz to 3,000,000MHz) but do not intend to radiate it. (see definitions at http://www.hallikainen.com/FccRules/2007/15/3/). Incidental radiators must use good engineering practice to minimize interference (see http://www.hallikainen.com/FccRules/2007/15/13/). Digital devices (I think motor control systems qualify as digital devices) in appliances are exempt from the emission limits for unintentional radiators (see http://www.hallikainen.com/FccRules/2007/15/103/), though the user must cease operation if the FCC finds it is causing interference. |
Trane furnace radio/TV interference
"Noon-Air" wrote in message . .. "Dave" wrote in message . .. Noon-Air wrote: SNIPPED As Jake said.... with the addition of.... Make sure that you have proper earth grounds for your power, and the HAM rigs/shack. That will go a long way towards eliminating RFI. Make sure that all the bonding screws in the furnace are clean and tight, make sure that the furnace has a proper ground also. When I put the shack together, I drove a seperate 8ft copper ground rod, and silver brazed #6 solid copper to it, then silver brazed the wire to the copper ground buss on the back of the bench. All equipment grounded.....no problem. de n6ojn As you describe your setup it does meet USA National Electrical Code. Your home should have ONLY one earth connection, not two! Actually as I live in a lightening prone area, my home has several earth grounds as do most of the other buildings in the area. As you describe it, your house presumably has the electrical service panel grounded to an 8 feet long ground rod where the service enters the house. The main service panel has 2 ground rods tied to the same buss, The TV cable entrance has a seperate earth ground, as does the telephone entrance, and the sub panel in the garage. You seem to have added a second 8 feet ground rod to your home specifically for the Ham station. Yes and that one too. Check with a local electrician for specific compliance issues. done did... the sparky is the one that put the extra rods in for the service entrance and the garage sub panel, and the city inspector signed off on it. /s/ DD You bonded all the grounds, eh? |
Trane furnace radio/TV interference
"Oscar_Lives" wrote in message news:UKS5h.278091$1i1.256793@attbi_s72... "Noon-Air" wrote in message . .. "Dave" wrote in message . .. Noon-Air wrote: SNIPPED As Jake said.... with the addition of.... Make sure that you have proper earth grounds for your power, and the HAM rigs/shack. That will go a long way towards eliminating RFI. Make sure that all the bonding screws in the furnace are clean and tight, make sure that the furnace has a proper ground also. When I put the shack together, I drove a seperate 8ft copper ground rod, and silver brazed #6 solid copper to it, then silver brazed the wire to the copper ground buss on the back of the bench. All equipment grounded.....no problem. de n6ojn As you describe your setup it does meet USA National Electrical Code. Your home should have ONLY one earth connection, not two! Actually as I live in a lightening prone area, my home has several earth grounds as do most of the other buildings in the area. As you describe it, your house presumably has the electrical service panel grounded to an 8 feet long ground rod where the service enters the house. The main service panel has 2 ground rods tied to the same buss, The TV cable entrance has a seperate earth ground, as does the telephone entrance, and the sub panel in the garage. You seem to have added a second 8 feet ground rod to your home specifically for the Ham station. Yes and that one too. Check with a local electrician for specific compliance issues. done did... the sparky is the one that put the extra rods in for the service entrance and the garage sub panel, and the city inspector signed off on it. /s/ DD You bonded all the grounds, eh? no, the RF grounds are not bonded to the power grounds. |
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