Re: SV: [LHA-misc] RFI/EMI with Home Automation devices

[Clay J. <cl...@nw...>]

I'd be surprised if there weren't at least SOME 'issues' with ANYTHING in=
 the 2.4GHz range and
the Gigaset.  I may be way off base here, but I don't beleive Bluetooth a=
ctually specifies a
particular frequency range - I thought it was just a software spec.

Clay

=C5ke Hedman wrote:

> Do you think this will be a problem with bluetooth as well as it is als=
o in the 2.4GHz band?
>
> /Ake
>
> =C5ke Hedman, YAP (Yet Another Programmer) http://www.brattberg.com/ake
> ak...@us... <mailto:ak...@us...>
> CC Systems AB, Box 83, 822 22 ALFTA, Sweden
> Phone: +46 271 19380, Fax: +46 271 19389
> Direct: +46 271 19209, Celluar: +46 70 2314980
> Projects: http://eda.sourceforge.net  http://mumin.sourceforge.net
> Carpe diem quam minimum credula postero
>
>
>
> -----Ursprungligt meddelande-----
> Fr=E5n: lin...@li...
> [mailto:lin...@li...]F=F6r Clay Jackson
> Skickat: Monday, April 23, 2001 7:08 AM
> Till: lin...@li...
> =C4mne: [LHA-misc] RFI/EMI with Home Automation devices
>
> Being an Amateur Radio Operator ('Ham'), I think I'm probably a bit mor=
e 'in
> tune' (intended pun, there) with potential RF interference (aka RFI, or=
 EMI)
> than most; and, my radio shack (also server room, telecom switch room a=
nd
> home office) is definitely a 'high RF' environment.  But, I still got '=
bit',
> and since it involved Home Automation, I thought I share my experiences=
 so
> someone else doesn't have to learn quite as much as I did...
>
> I've got a Siemens "Gigaset" phone system, which consists of a base uni=
t and
> 4 remotes which are cordless.  The system uses Spread Spectrum Technolo=
gy
> (meaning it's transmit/receive frequencies CHANGE) in the 2.4 Ghz range.
> The base unit is hung on the wall behind my monitor (until I get around=
 to
> moving my ISDN TA, which feeds the phone lines into the GigaSet - at wh=
ich
> point the base unit will move to a phone panel in the garage).
>
> At a hamfest a few weeks ago, I got a great deal on 4 X10 'XCams', alon=
g
> with the receiver and other goodies.  I started setting up the XCams th=
is
> weekend and discovered that if the camera was more than 2' from the
> receiver, I got LOUSY reception, or none at all.  After sratching my he=
ad
> for a while, I unplugged the Gigaset (thereby interrupting all of our p=
hone
> service execpt our backup 'POTS' - my wife sometimes hates my gadgets),=
 and
> presto, the XCams started working just fine.  Turns out the Gigaset and=
 the
> XCams share the same frequency allocation - and the Siemens people want=
 to
> 'own' the whole band (interestingly enough, there was NEVER any interfe=
rence
> TO the Gigaset phones FROM the Cameras, just the other way 'round.
>
> So, I plugged the Gigaset back in and opened up the X10 receiver.  I
> discovered that it had an F type connector (ala cable TV) on the back, =
for
> channel 3/4 out.  I clipped the lead from the oscillator to the connect=
or,
> and connected the (input) antenna lead to the F connector.  Then, I too=
k a
> piece of coax cable (RG6, for the purists out there), stipped the inner
> conductor, and wrapped it around the antenna of a camera about 50' from=
 the
> receiver.  Presto - hard wired video!
>
> Tonite, I'm gonna open up one of the cameras and see if I can figure ou=
t how
> to more permanently mount a cable - also, there's a thinner 75 ohm cabl=
e out
> there that I'm gonna try as well.   I figure that since only one camera=
 is
> powered at a time, a regular cable TV splitter will probably work OK fo=
r
> feeding signals from multiple cameras into one receiver.
>
> I'll keep the list posted on my results - and, as soon as I get a web s=
erver
> up, I'll put pictures of the whole mess up as well.
>
> Thought this might be interesting for other folks who are starting to d=
abble
> in wireless stuff around the home - turns out that the same frequencies=
 are
> being used (or proposed) for all SORTS of 'consumer' gadgets.   And, of
> course, the manufacturers are taking a 'caveat emptor' approach the the
> whole problem....
>
> Clay Jackson
> N7QNM
>
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