Date: Mon, 06 May 2002 15:36:54 -0500

Author: "Dennis C. Henry"

Subject: RE: video camera

Post:

Fellow tappers,

We haven't been using any wireless video cameras, but we have been
accumulating experience with two other 2.4 GHz-band users, namely wireless
internet (both DSSS and frequency-hopping protocols), and microwave ovens
at 2.45 GHz. It may be that some problems with the x10 cameras could be
traced to either indoor or outdoor wireless units. It could also be that
moving the x10 cameras changes the antenna orientation so that the
polarization becomes unfavorable. We found that antenna polarization for
the DSSS antennas was important, and that reflections confused the issue.

The microwave ovens can really cut down on the packet rate and S/N ratio
for nearby DSSS wireless systems. We have been doing some experimental
research on this here, and have also located a couple of web resources that
address the issue.

Dennis

At 02:50 PM 5/6/2002 -0500, you wrote:

>Tim,
>
>Mine are also 2.4 Ghz. I have heard that some people have alot of trouble
>with these, but haven't really experienced it myself. The only thing that
>happens for me, is that sometimes when I do rotational things like the
>lunar phases demo, or coreolis, the picture will briefly roll on every
>rotation if you don't play with the antenna orientation.
>
>Later,
>Dale
>
>On Mon, 6 May 2002, Tim Cook wrote:
>
> > Dale -
> >
> > I'm surprised that you get good results with moving cameras. We bought
> a 2.4
> > Ghz camera from Supercircuits and were really disappointed - the signal
> > would break up if the camera was moving very much at all. When we went to
> > exchange it they said that was normal so we got a refund instead. What
> > frequency is the x10?
> >
> > Tim Cook, AZ State
> >
> > > ----------
> > > From: Dale Stille
> > > Reply To: tap-l@listproc.appstate.edu
> > > Sent: Monday, May 6, 2002 12:09 PM
> > > To: tap-l@listproc.appstate.edu
> > > Subject: Re: video camera
> > >
> > >
> > > Jerry,
> > >
> > > Yes, it is. The resolution of the camera is a little low, but for
> > > applications like moving frames of reference or rotating frames and
> > > motion, you can't beat a wireless. The nice thing about these is that
> > > they are cheap enough that you can buy and dedicate a camera to each
> > > application that you may have. Make sure you get the battery pack
> for the
> > > camera......when I bought mine, this was a seperate item, but what you
> > > really need to make this a true "wireless".
> > >
> > > Later,
> > > Dale Stille
> > > U of Iowa
> > >
> > > On Mon, 6 May 2002, Jerry DiMarco wrote:
> > >
> > > > Tappers,
> > > >
> > > > Is the X-10 wireless video camera the one we were talking about a
> > > few
> > > > months ago? If so, are those of you who bought it happy with its
> > > > performance? It's getting close to the end of the FY, time to
> spend the
> > > > remainder of my budget. Thanks for your recommendations...
> > > >
> > > > Jerry
> > > >
> > > > <><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
> > > >
> > > > Jerry DiMarco
> > > > Manager of Lecture Demonstrations and Instructional Labs
> > > > Montana State Univ., Physics Dept.
> > > > Bozeman, MT
> > > >
> > > > Our Motto: "We don't use anything the way it was meant to be used."
> > > >
> > > >
> > >
> > >
> >

Dennis C. Henry Office Location: 213 Olin Hall
Professor of Physics office phone: (507) 933-7314
Gustavus Adolphus College office fax: (507) 933-6104
800 West College Avenue home phone: (507) 931-2784
St. Peter, MN 56082-1498
e-mail: dchenry@gac.edu http://physics.gac.edu/~dchenry/

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