Hi back, For a plug and play solution it's great. Don't tell anyone but in my opinion it's just a clone of an earlier Selectone circuit I already use. So I build them when I have time and buy them when I don't.
One bad thing about these homebrew and kit-built filters is how they can and do drift with temp and time. The newer Norcomm units are much more stable & smaller using current surface mount parts. If you home brew something... get good stable parts (ie quality caps and resistors) or you'll make un-needed repeat alignment service calls. Yes they are narrow... but they also respond to slightly off frequency signals and in most cases it's enough to get the job done. For a number of smart reasons... one of the large linked repeater systems here on the West Coast use notched ctcss vs a low pass filter. Works well and I/we have never had to realign the notch filters since the system was installed. gonna' see you at Dayton this year Bob? cheers, skipp > [EMAIL PROTECTED] wrote: > Hi Skipp, > > What's your satisfaction level with the Norcom notch? A spec of +/-0.1% > BW means only 3.5 Hz of BW at the -40 dB points at 1750 Hz. And that's > for a tunable product, so you'd have to tune it dead on to get just 40 > dB of notch. The users' generators would also have to be very accurate > to be in the center of the notch. > > 73, > Bob >
