Problem solved!
I tried a little aluminum shielding on the control box (the plastic one that
supports their wireless sensors), and that was a waste of time. I gave it a
shot while waiting for my delivery of ferrite cores from Mouser. Didn't cost
anything and was worth a try.
The security
One or more of the wires going to your system must be resonant on 40 meters and
is picking
up RF directly from the antenna.
I had horrible problems when I had an inverted L with the horizontal part over
the house.
My alarm is a 'wired' type that has terminating resistors at each of the
Hi Jim,
I think it may be a fact of life with alarm systems since they have wiring
all over the house. On mine, high power would signal an alarm identified as
a fire alarm. I identified the wires in the alarm panel that went to the
smoke detector input screw terminals and added a clamp-on ferrite
For some reason, probably resonant length of coax or something, plus the 40
meter dipole runs directly over the house and parallel to the incoming power
service, Every time I key a rig with more than about 50 watts, I trip every GFI
outlet in the house. I haven't found enough big snap-on
I had similar issues over the years with my GFI receptacles. I put
ferrites on the power leads both at the receptacles and in the main
distribution panel but was only able to reduce the problem and/or move
it to other bands. I then tried different brands of receptacles and,
after trying
On 3/18/2012 12:08 AM, Vic K2VCO wrote:
I would start with the phone line and the power
supply. Remember, at 40 meters you need to as many turns as you can get
around the cores.
Just passing the wire through a bead won't do it.
Security systems are notoriously awful for RFI. Vic has given
On 3/18/2012 7:05 AM, Jim Sheldon wrote:
I trip every GFI outlet in the house. I haven't found enough big snap-on
ferrites to hit all the romex coming out of the panel, but when I do, I'll
certainly put 'em on. A really big one that would snap around the incoming
line at the panel would
I live in a single family townhome (house with lots of HOA rules) and a
fan dipole in the attic. With the dipole oriented NW-SE, it was right
over my radio controlled garage door opener. Operation at 100 watts on
any band would turn on the light, but on 40 meters the door would try to
go up
Just when one thinks all is good in the world... I re-worked a Hustler 5BTV so
that it covers 40-30-20-15-10 meters, rather than 80-40-20-15-10. The mod was
simple - cutting off five inches from the top tube. No problem. It now has a
1.1:1 SWR across most of the bottom of 40 meters. Sweet.
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