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LF: Re. Morse tones filters etc.

To: "rsgb lf group" <[email protected]>
Subject: LF: Re. Morse tones filters etc.
From: "LAWRENCE MAYHEAD" <[email protected]>
Date: Tue, 23 May 2000 14:41:08 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Hi All,
I think that what we have here is re-inforcement at certain frequencies due to the proximity of reflecting surfaces at critical distances(similar to "eigentones produced in a room by the walls) The example given by ON6UX where a tube/Jar is used to enhance signals is most probably a " Helmholtz" resonator (I think thats the name) which can be used to produce a resonance with quite a high Q. 
The technique is used in Hi Fi systems  in bass reflex loudspeakers,and details can be found in Hi Fi books,also in Physics text books in the sound sections.Could be very intresting to try an experiment.734s Laurie. 
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