A sledgehammer will correct it as well ;-) And the advantage is that you'll never have to worry about tuning later on.
Chuck WB2EDV ----- Original Message ----- From: "Eric Lemmon" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, May 23, 2005 9:30 PM Subject: Re: [Repeater-Builder] Transmit Noise >> Don, > > You have it right; the correct term is "microphonics." The IEEE Standard > Dictionary of Electrical and Electronics > Terms defines microphonics as "The noise caused by mechanical shock or > vibration of elements in a system." > > Tube-type amplifiers are extremely prone to microphonics, since they have > grids and plates that can be vibrated > easily. Solid-state devices are much less prone. > > IMHO, the most frequent culprit of microphonics in recent radio equipment > is the thin aluminum shield can over a > frequency-determining coil/capacitor combination. Vibration at an audio > rate- such as a human voice- may vibrate the > thin shield enough to affect the capacitance to ground of the enclosed > tuned circuit and lead to modulation of the RF > within. Total encapsulation with wax or epoxy usually corrects this > effect, but it makes it difficult to tune the > circuit later. > > 73, Eric Lemmon WB6FLY > >> >> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
