I recently installed a CO alarm (required by code) and I observed a
sensitivity to 40m transmissions. It only occurs when I am about around
50W... the alarm goes off for a few seconds. My antenna (dipole cut for 80m
with a tuner) is on the outside of the house right now, but I have plans to
move
I was wondering if i can cure an annoying problem when I am sending cw on
the hf bands above 15 meters.
I have a small mini beam on the roof and my shack is directly under it.
When I work the bands above 15 meters my smoke alarm beeps. Its in the hall
between the bedrooms, so don't want to move
If it is a wired-in smoke detector, try putting a .01 uFd 1400-volt AC
rated cap directly across 120-volt AC power leads. If that isn't
enough, then try a capacitor the between (across) the wire, if there is
one, that connects it to the other detectors and the AC neutral lead.
If the unit
If Jim's ideas don't work you could simply try another detector of a
different brand. Susceptibility to RF varies in unpredictable ways and
that is an easier solution than moving the detector (move it where?
Would it actually help?).
Another approach, if it is a 'wired-in' detector, is to
. Then again, direction of the beam could be a factor.
Rich, n0ce
- Original Message -
From: Jim Wiley
To: haircut...@verizon.net
Cc: elecraft@mailman.qth.net
Sent: Friday, February 01, 2013 11:40 AM
Subject: Re: [Elecraft] annoying problem
If it is a wired-in smoke detector
If the smoke detector is wired to the AC line, wrapping as many turns of the ac wiring as
possible around a ferrite toroid or rod should cure it. The little Radio Shack split
toroids sold for this purpose work. Or you could replace it with a battery-powered model.
If you already have a battery
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