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
JMSquelchFreqResponse.png
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JMSquelchTransient.png
Description: PNG image
