California fires: smart speakers and emergency alerts

Chris Boyd 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:

162.400
162.425
162.450
162.475
162.500
162.525
162.550

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.

—Chris




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