[Make-wifi-fast] 2.4Ghz hybrid wiring for nest protects

Aaron Wood woody77 at gmail.com
Tue May 18 12:02:43 EDT 2021

I've seen similar techniques used for creating isolated wifi device test
labs.  Each device is locked into a small RF isolation box, with bulkhead
fittings for power and coax.  A 2.4GHz (or 5GHz antenna, or both) is placed
inside the box, and then the boxes are wired to one another in any topology
that is desired.  splitters of course dropping the signal in the coax, but
really not much more than in the air.

You might want to do some test setups with cheap isolation boxes of wire,
to see how much signal you'll get through your antennas and coax.

On Mon, May 17, 2021 at 11:09 AM Bob McMahon via Make-wifi-fast <
make-wifi-fast at lists.bufferbloat.net> wrote:

> Hi All,
> There is a historic building that has 5 floors and no fire alerting
> associated with the rear fire escape ladder. I'm considering installing
> nest protects in each unit near the rear egress to alert of the fire escape
> is compromised by fire. My guess is floor to floor wireless communications
> may not work too well.
> I'm thinking about cleaning up the communications runs in the rear of the
> building. The cable company did a shoddy job of hanging cable for TV
> services in the 80s. It seems a good time to add communications conduit and
> run more modern cabling.
> As part of this, I'm considering running LMR 600 cabling on the exterior
> brick wall to act as 2.4Ghz communications wave guides. I was thinking make
> a loop but break the loop at each floor with a 2.4Ghz wilkinson power
> divider
> <https://www.pasternack.com/2-way-n-wilkinson-power-divider-690-mhz-2.7-ghz-10-watts-pe2092-p.aspx?utm_source=google&utm_medium=cpc&adpos=&scid=scplpP74039&sc_intid=P74039&gclid=CjwKCAjwqIiFBhAHEiwANg9szk1JG2oJufz2G2Hylc6oOgOSl-tBN5O39Kn2T1pHV4g8_r8AnkFA7xoCFhUQAvD_BwE>.
> Then bore a hole into each unit and install a 2.4Ghz patch antenna
> <https://www.l-com.com/wireless-antenna-24-ghz-8-dbi-round-patch-antennas>
> pm each rear interior wall. Each unit would then install a Nest protect on
> the ceiling from the patch antenna. The ring or loop topology I think gives
> a bit of redundancy.
> Thoughts on if this would achieve the goals of supporting nest protect
> communications for such a building?
> Bob
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