[RFI] Non-RF sensitive hardwired smoke/fire alarms?

[w6rgs at cox.net]

Kelly,
Last year, we re-wired the entire house (power, phone, cable tv and 
data) and installed new Kidde KN-COSM18 hardwired detectors, 
including one in the shack.  No issues, even when the SB-220 is used.
Bill W6RGS


At 08:25 PM 7/9/2014, Kelly Johnson wrote:
>I would also be interested to hear about others' experience with hardwired
>smoke/fire/CO2 detectors.  Building codes now require new construction to
>have hardwired/interconnected smoke detectors.  I read lots of horror
>stories about hardwired smoke detectors on the web.  All of the ionization
>type smoke detectors and CO2 detectors in my house have no RFI/EMI
>problems, but both of the photoelectric fire detectors chirp when I run
>QRO.  I have to pull out the battery when I run QRO.  That wouldn't be so
>easy with a hardwired detector, so I'd like to know how to avoid problems.
>Will ferrite beads on the leads be sufficient?  Are there brands that are
>known to be less problematic?