--- [EMAIL PROTECTED] wrote: > At 4/17/2007 22:57, you wrote: > > >Hello, > > > >This email message is a notification to let you know that > >a file has been uploaded to the Files area of the Repeater-Builder > >group. > > > > File : /dual_level_sq.pdf > > Uploaded by : skyislandpage <[EMAIL PROTECTED]> > > Description : Micor replicant squelch circuit using regular parts > > > >You can access this file at the URL: > >http://groups.yahoo.com/group/Repeater-Builder/files/dual_level_sq.pdf > > I entered the noise filter portion of the schematic (U2A & B) into > CircuitMaker & ran an AC SPICE analysis. Unless I'm doing something > wrong, > I see 55 dB of gain @ 7.2 kHz! As expected, the transient response > is > appalling, with lots of 7.2 kHz ringing for several milliseconds. > > Plots attached. > > Bob NO6B
That might be. I have never run any simulation on the circuit, but I have built two of them and they work fine. 55dB of gain might be about right. The rectified DC is 3 to 4 volts with an input (at that frequency) of 100mV or less. Someone can clean up the filter design, if needed. I do not claim this to be well engineered or an "end-all" circuit, just something that does work. Tweaking of the resistor or capacitor values might improve things on the simulation. I am not sure if the "ringing" would affect the operation much, but it probably could be engineered to remove or limit that, but I never saw any problem with the circuit from an operational standpoint. Joe __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
