I have a carefully selected pair of sledgehammers here for use on-site: 8 lb and 20 lb.
I seldom need the use of the 20 lb ... that one time use guarantees it will never be needed for that project again. Neil - WA6KLA Chuck Kelsey wrote: > > 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/
