Re: Help on a strange problem

[Jim <alarminex@xxxxxxx>]

On Aug 26, 1:09=EF=BF=BDpm, "petem" <petem...@xxxxxxxxx> wrote:
> "Jim" <alarmi...@xxxxxxx> a =EF=BF=BDcrit dans le message de groupe de di=
scussion :
> f158bbab-f71c-4a35-96c0-ce194f154...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>
>
>
>
> > On Aug 26, 11:11 am, goodday <chris....@xxxxxxxxx> wrote:
> >> On Aug 26, 8:42 pm, Frank Olson
>
> >> <use_the_email_li...@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> >> > goodday wrote:
> >> > > I recently manage to get hold of a RF scanner. I use it to scan th=
e
> >> > > living room of an apartment. The scanner beeps in mid air when a
> >> > > human
> >> > > body object is near to the scanner. Can some one tells me what can
> >> > > possible to the cause?
>
> >> > > Is it possible for the reflected frequencies from a motion detecto=
r
> >> > > to
> >> > > trigger the beeping sound?
>
> >> > "Human body object"... HBO... "New show every day." :-)
>
> >> > Seriously... An RF scanner is liable to pick up any RF (depending on
> >> > the quality of the unit). What's the make and model #? Is the
> >> > security
> >> > system in the apartment a wireless job? Before we can answer your
> >> > question, we need some more info.
>
> >> I use a normal RF scanner call pro hunter. It has a wide RF range. To
> >> my knowledge there is no security system installed in the apartment. I
> >> tried using the scanner in other parts of the apartment it doesn't
> >> beep. Most of the beeping is in the living room. The strange thing is
> >> it beeps in mid air at a distant away from the floor and ceiling. If
> >> you move away to one side, it stops beeping. Please help me to
> >> understand.-
>
> > What =EF=BF=BDyou really have is a broadband RF receiver.
>
> Nope , he is using this...
>
> http://www.mjelectronics.com/pages/countspy/005prohunrfd.html
>
> DETECTING DISTANCE:
> Wireless Camera: 1.2 GHz --- about 3 M; 2.4 GHz --- about 70 cm Cellular
> phone: about 1 M Applications:
> Detect hidden camera in hotel, motel and club house. Detect hidden camera=
 in
> shopping mall toilet, school toilet, locker room and fitting booth, etc.
> Prevent video body bugs to protect office, factory and personal privacy.
> SPECIFICATIONS:
> Size: L 79 x W 28 x T 15 mm Weight: about 26g (included battery) Power: 6=
V
> DC (CR2032 lithium battery x2) Detecting frequency: 50 MHz =EF=BF=BD` 3.0=
 GHz
> Warning mode: Sound and LED display-

Ok, so it's a narrow band receiver.

Same problem. Same reason. Beat frequencies, harmonics.