California fires: smart speakers and emergency alerts
cboyd at gizmopartners.com
Thu Jul 26 17:31:31 UTC 2018
> On Jul 26, 2018, at 12:09 PM, valdis.kletnieks at vt.edu wrote:
> Do those use a frequency band that's suitable for cellphones to monitor (antenna
> size, power, etc)? Because your best chance of getting my attention in an emergency
> is to make my phone start shrieking.
VHF, on 7 frequencies:
That’s about 1.85 meter wavelength, so a quarter wave antenna would be pretty large. I’m sure the RF engineers can come up with a way to listen effectively without a huge antenna.
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