[RFI] Nighthawk CO2 Detector

[ke2n@cs.com]

They have a web site where you can ask a question, although its unlikely to be fielded by an engineer ...

http://www.kiddesafety.com/kiddesafetycorp/contact.html

The company would probably be happy to sell you a battery powered version of the same thing - that should be inherently more immune

Ken

PS - we suppose you mean CO detector, not CO2 detector....



>
>> -----Original Message-----
>> From: Chuck Gooden - N9QBT 
>> I am having RFI problems with a Nighthawk CO2 detector when I operate on 40 
>> Meters.  Does anyone have any Ideas on how to get rid of this problem.
>> 
>> I am planning to try a Ferrite core on the AC Line (hot lead only) inside the 
>> electical box as soon as I can get some but any other ideas would be welcomed.
>> 
>    If the signal is coupled to the line in differential mode, then this might work although in in-line coil would work better; but usually it's induced common mode onto the line.  If it's common mode, then you need to wrap the whole power cable (hot, cold & grd) onto a ferrite.  Here's a diagram (hope it comes through OK):
>
>    Differential Mode:
>                  induced signal path ----->
>                              ______________________
>    AC POWERLINE ______________________
>                                               <-----
>
>    Common Mode:
>               <----------
>         ____________________
>    AC ____________________
>                <----------
>
>> The CO2 Dector is Model KN-COPP-3, Assembly #900-0076, Manufactured 17 April 
>> 2000.
>> 
>    Be sure to contact the mfr to let them know about the RFI problem.  Usually, telling customer service is a waste of time.  Find the people who care about such problems (if they even exist!).
>
>    73,
>    de ed -K0iL
>
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