Posted by Wayne Parham [ 70.234.146.110 ] on April 25, 2008 at 12:36:37:
In Reply to: port size posted by David Morehouse on April 25, 2008 at 09:09:29:
Check out the Helmholtz formula below. You can tune to the same frequency using different port sizes. As port area is increased, port length also has to be increased to tune to the same frequency. When in doubt, measure impedance and look for the minimum between the peaks.
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