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

[Bob McMahon <bob.mcmahon@broadcom.com>]

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yeah, thanks for this. I have access to such RF enclosures at work. I'll
likely build it out first here in CA before shipping. I purchased a HackRF
one as well for on premise measurements.

I was also hoping to get API access into the fire alarms for cloud based
remote monitoring, basic things like batteries need replacement or an
unexpected device removal from the mesh. I haven't found a way to do that
yet.

Bob

On Tue, May 18, 2021 at 9:02 AM Aaron Wood <woody77@gmail.com> wrote:

> 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@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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