Thanks for sharing the circuit. Now someone needs to design a printed circuit board for it and make it available to those not having the wherewithal to make their own.
Chuck WB2EDV ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, November 27, 2003 12:05 PM Subject: [Repeater-Builder] Re: PL/CTCSS Filter > I've seen a lot of posts on this subject but no posting of an actual filter > schematic. Here's mine. It includes a de-emphasis section for flat audio > response systems; omit if using pre-emphasized audio in your controller. > > As John pointed out in an earlier post, the performance of the HPF in the > ComSpec TS-32 leaves a bit to be desired. Yes it will strip CTCSS tones > nicely, but it has a poor transient response & will "ring" around 400 > Hz. This is the reason systems using this filter have a "boxy" sound. > > For my system I decided to use the filter in the Sigtone C1116 decoder. I > redesigned the filter to cut off a bit low in frequency (210 Hz) in order > to slightly improve system audio quality, since I didn't need brick-wall > filtering at the higher tone freqs. that I don't use. > > Happy Thanksgiving everyone! > > Bob NO6B > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
