On Sat, 5 May 2007 08:11:40 -0400, "Robert11"
wrote:

Hello:

I realize that everyone is going to probably write back and tell me I'm
crazy, but this is really driving me crazy, so let me ask, please.

I'm a retired engineer, but have never worked much with RF.

I have been putting up several models of Kidde and First Alert smoke
detectors in my new house recently.

Several different models, from both brands, both ionization and
photoelectric, some with the 9V battery, some with
the built in 10 year Li cell.

All exhibit the same performance:

About once every day or so, at totally random times, they give 3 or 4
Chirps, then nothing for approx another day or so.
This is not the indication that it gives for an actual fire; rather from the
skimpy instructions they include, an indication of needing a new battery, or
some internal fault the circuitry has discovered on its own.

All the batteries are brand new.

Here's what I'm leading up to:

About a quarter of a mile from my house, in a direct line, there's a Ham
operator with a massive mast of what must be pushing 100 feet in height.
Almost the kind you would see for a small commercial station. Has all sorts
of antenna and beams mounted to it.
I have no idea what freq's he operates at, and really don't want to ask him.

This is obviously a chap who takes his hobby seriously, and probably
radiates at the max allowable power levels, I would guess.

Is there any possibility that if he points his array at my house, it might
radiate enough power to cause my problem ?

If not, any thoughts on what else might be causing these chirps from two
different mfg's., and several models ?

Much thanks,
Bob

I don't think you could trip a smoke detector with RF if you tried.

Those things work very well. Multiple sensors triggering means you
have a REAL PROBLEM!

There is either some connection smoldering (damaged wall switch?) or
some substance in the air being circulated by the ventilation system
that is triggering the alarms.

Unless you have an all electric house you need carbon monoxide sensors
as well.

Visit your local Fire Station and ask their advice. They will likely
take a serious interest in your problem.

Whatever you do, do not ignore the problem!

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"