| per weems, you [message #36124 is a reply to message #36122] |
Sat, 27 April 2002 08:25   |
Sam P.
Messages: 307
Registered: May 2009
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Grand Master |
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need to identify three freq.s using a z plot test setup. The lower peak is Fl, the upper peak is Fh, assuming a vented reflex enclosure. Then Fc, a single peak is found with the port sealed. Fb = sq.rt.[Fl^2+Fh^2-Fc^2] Fb is the box tuning of the whole system, after all is said and done.
A 'scope can also be used, the elipse will go into a flat line at Fb. Of course, your accuracy depend upon your sig gen calibration, that's life...but the sig gen cal can be verified against line freq (60Hz), so how far off will you be to either side...not much. Sam
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