[600MRG] Smoke Alarm I - more

[Frank Lotito]

Is a 0.01 uF bypass cap adequate for 500 KHz?  At 14 MHz its (ideal) reactance is 1.1 ohms.  At 0.5 MHz its reactance is almost 32 ohms.  If the line impedance is high, such as a few hundred ohms, maybe it will be sufficient.  Maybe - but I don't get a warm fuzzy feeling.  To boot, if this cap is across a 120VAC 60 Hz power line something more deliberate w.r.t. safety has to be included when choosing the bypass cap. 
73 Frank Lotito, Plum, PA K3DZ and pending WH2XHA 

> From: kgordon2006 at frontier.com
> To: w7ekb.com 600MRG at w7ekb.com
> Date: Tue, 21 Oct 2014 13:13:44 -0700
> Subject: Re: [600MRG] Smoke Alarm I - more
> 
> From Neil's description of what he found, I would also imagine that adding 
> 0.01 mfd disk ceramic bypass capacitors across any signal-pair of wires 
> MIGHT do much to mitigate, if not eliminate, any problems caused by RF on 
> the lines.
> 
> Ken W7EKB
> 
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