[RFI] RFI to new photoelectric smoke detector

[Kelly Johnson]

My inlaws just bought us a couple of new photoelectric smoke+fire
detectors.  They are both 9v battery powered First Alert model
SA710CN.  They are sensitive to RFI when I run 1KW.  I did not have
RFI with my older (non-photoelectric) smoke alarms and I do not have
any other detectable RFI issues in my home.  The issues are there on
multiple bands with my yagi (65 feet above the house) pointing in
multiple directions.  I have not tried 80m with my lower hanging
dipole.  I can easily replace them, but with what?  Anyone have
smoke+fire detectors that are known to be immune to RFI?

Is "photoelectric" fire detecting technology particularly susceptible?