Re: 310Mhz Garage Opener Detector

The observation (below) is quite good, and to eliminate the confusion you
need
to attenuate the signal and use a horizontal dipole or short yagi to find
directional
bearings. This would essentially become a "fox hunt". Using sensitive
equipment
may actually become counterproductive, especially in a reflective enclosure.
If I'm not mistaken, the digital pulses from openers are difficult todetect,
as they
are bursts in msec ranges, not nice constant AM/FM transmissions. Metering
this
would be frustrating.
Perhaps the interference is from some outside source, not even one of the
tenants.
What if you attenuate the receiver sensitivity. Afterall, the door neednot
sense
a command unless the car is within 15 feet of the door. And a car with a
"stuck
key" parked 30 feet away will not play havoc with the system.
Sounds like an easier solution...........

Les KA9GLW
"Jumpster Jiver" <me@xxxxxxxxxxxxx> wrote in message
news:ir7lf.4707$6Z5.721@xxxxxxxxxxx
> DMF wrote:
>
> > All,
> >
> > I live in an apartment and we have a radio controlled garage door
> > opener. Every once in a while someone's remote gets stuck on and
> > the door remains open until the battery dies (there are about 40
> > cars in the garage). I looked at my remote and its a Linear Corp.
> > Digital Transmitter Model DTD which transmits on 310Mhz.
> >
> > What I'd like to do is find a cheap receiver of some kind that would
> > allow me to detect which car has the stuck remote. I was thinking
> > that maybe an X10 product might be easily adaptable to my purpose
> > since they use 310Mhz frequency. What I would like is a hand-held,
> > battery operated device that would beep or indicate when it was near
> > a remote that was active so I could walk through the garage and find
> > out who needed to be contacted to fix their remote. Any suggestion?
> >
> > Alternative solutions are welcome (other than moving ;-)
> >
> > Regards,
> > David
> >
> >
> I'm no radio expert but...
> You may need more than a receiver. The signal may reflect off the
> walls and cars in the garage and bounce around. You might need complex,
> sensitive equipment to "triangulate" where the signal is coming from.
> This would be a very expensive system using three antennae and receivers
> to sense from which direction the signal is strongest. Since these
> openers sometimes operate for 50 to 100 feet away from the receiver the
> signal would be bouncing all over the place and make it very difficult
> to find the source within the garage.
> Someone more experienced in radio frequency equipment may have a better
> or much simpler answer for you.


.

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