California fires: smart speakers and emergency alerts
egon at egon.cc
Thu Jul 26 18:13:51 UTC 2018
On Thu, Jul 26, 2018 at 12:31:31PM -0500, Chris Boyd wrote:
> 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.
For 162Mhz, a 1/4 wave antenna would have a vertical radiating element of around 17".
However, for receive only purposes, it's not necessary that the antenna be resonant. You can demonstrate this yourself with any FM radio and a paperclip.
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