Stan:
Does the interference to the smoke detectors occur at very low RF
output...say 5 or 10 watts? Or does it occur only AT higher output levels.
Can you get schematics for the smoke detectors?
Have you attempted to contact the importer or manufacturer to inquire about
the application of bypass caps to AC power lines or battery leads as well
as other parts of the device to minimize the effect of RF on the chirp
circuit?
In the short term, disabling the offending devices except when testing is
one way to cope. Battery operated spares can be temporarily placed while
you sort thus out.
What sort of antennas are you using and how high are they?
73,
Frank N. Haas KB4T
Utility Interference Investigator
ARRL Tech Specialist, RFI, N FL Section
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