> The repeater controller normally strips off CTCSS/PL from the rx > audio from an incoming mobile by use of a high pass filter set to > roll off all below 300hz.
It's a nice thought but most of the more common plane-jane repeater controllers seen around (available) have little or minimal filtering directed toward CTCSS Tone reduction included in their audio chains. Many plan-jane Repeater Controllers are fairly wide-band through the voice and ctcss audio range. Wide-band audio can be fairly problematic in some repeater system operations. Other times the wide-band audio controller throughput can be a desired operation (in linked radio systems as an example). It's all about how you plan your system layout. Hence one reason I like some of the CTCSS Boards, which include an available Sub-Tone Audio Filter Section. A long time Industry Standard external CTCSS Board with an available series filter section (which can also be gated on/off) is the famous Comm Spec TS-32 or TS-64 Models. http://www.repeater-builder.com/com-spec/com-spec-index.html Route the desired receiver audio through your sub tone or notch filter section of choice before making the trip to the controller. Unless of course you want the CTCSS Information to go into the repeater controller. Some of the high-end repeater controllers are able to remove and decode CTCSS information presented to the audio input section. Life goes on (thankfully)... cheers, s.
