PSN-L Email List Message

Subject: SuperHetrodyne FM or AM Seismic Sensor ?
From: Geoffrey gmvoeth@...........
Date: Wed, 13 Apr 2011 14:27:38 +0000


Has anyone ever heard of the following Idea ?
SuperHetrodyne FM or AM Seismic Sensor.

It would work very similar to pre-existing radio circuits
except you have a reference oscillator and a sensor
oscillator and you mix the the two frequencies
looking only at the sum and difference
frequencies ?


The idea is old but the circuitry already exists
which might be exploited for this purpose ?


geoff
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