After looking over the LBIs and performing a few conversions, I have a question regarding which everyone feels is the best source for a CAS signal into a repeater controller - CAS, RUS, or RX Mute.
In regards to a COS source, I see a number of publications and sites recommend CAS, then I see a few others using RUS, and looking at the schematics, it appears RX Mute may not be a bad choice also. As originally configured, per the LBIs, a Channel Guard configured MastrII would trigger CAS with a carrier squelch signal, and RUS would only go active with the proper PL tone present. But once the Channel Guard board is removed, is one any better than the other for cos usage? Assuming C630 is in place on the IFAS board, does only one of the above sources afford the dual speed squelch action, and the others not, or do all three provide the same dual-speed muting action? Looking at the IFAS schematic and squelch chip block diagram, it is not very clear. Also assume the PL detect signal has been isolated from the squelch circuit, and only feeds the external repeater controller, so there would be no interaction regardless of PL being present or not (similar to removing JU202 on a Micor A&S board to isolate pl from causing the squelch chip into long mode whenever pl is present). Eric KE2D
