[TVI-RFI-EMI] KIDDE co2 problem

[FireBrick]

Duh...
A firefighter for 30 years. And went on many carbon monoxide calls.
Mark it up to old age that I miswrote that as co2...when I know it's really CO.
Old age sucks.

And thanks for the suggestions.

I'm sure your correct about it being wire borne, My antenna goes right over the house.
But...one detector does not trip in the outlet, and the new one does. In the same outlet.
So there is just enough rf being inducted into the house wiring I think to trip one 
detector but not the other, newer model...

Will keep trying...I got a bag of .01's here...from days gone bye.



----- Original Message ----- 
From: <N1KHB at aol.com>
To: "FireBrick" <w9ol at billnjudy.com>
Sent: Monday, January 31, 2005 7:57 AM
Subject: Re: [TVI-RFI-EMI] KIDDE co2 problem


> Bill,
>   Don't you mean to call it a CO (carbon monoxide) detector? A CO2 (carbon dioxide) 
> detector is something that usually requires lab eguipment to measure. Assuming that this 
> is the case, the one that plugs in across the room may be the clue and partial answer. 
> It sounds as though the rf energy is line born. Since the house is split into two major 
> circuits because of the 240v to 120v split in the breaker or fuse panel, the seemingly 
> immune detector is probably on the other "side" of the split. The other detectors then 
> are likely sharing the other side with your radio. I would try a decoupling capacitor 
> across the line voltage first where the radio plugs into the wall. A nice big hefty 
> 500-1,000 volt ceramic type in the .01 to .1 microfarad region. This one can be 
> contained within a male 120v plug to plug into the receptacle next to where the power 
> supply is plugged in just to try. Then if that doesn't do it, try the same at each 
> outlet of where the detectors are plugged in as well. You can also try LC filters either 
> home brew or commercial ones like Corcom. There is one other possible thing to try. If 
> you are using a Astron power supply, be aware of the following not generally realized by 
> many. The minus side of the power supply is linked to earth internally. Since your 
> station is likely to be seperately grounded anyway, the internal power supply link is 
> redundant and may even create a ground loop which can make problems such as yours more 
> difficult to troubleshoot and to fix. I would suggest to eventually unlink this ground 
> internally.  Power supplies do not need this connection for normal operation. Floating 
> works just fine unless an earth connection is actually called for. You can always 
> reconnect it externally later if desired. We have tons of bench power supplies at work, 
> and NONE of them are grounded unless we want them to be save for the few Astrons that I 
> have ordered for work and I always unlink those as well. Good luck!
>
> Joe N1KHB
>