At 12/13/2007 13:01, you wrote: >By the way, if you have not noticed it yet, the RUS >signal on a GE system is a combination of the COS and >CTCSS signals, and works great as the COS input to >your controller. It shows a slight delay coming up >(while the CTCSS decoder locks up) but turns off
Actually, I've found that the RUS line has a slight delay even without using CTCSS. This has the effect of making "picket fencing" sound much worse because the squelch stays closed for a greater percentage of the time. I use the CAS signal (J912 on the MVP SAS board) & add a 3.3 uF cap to pin 13 of U901 to make the MVP squelch work like a Mastr II mobile squelch. >Also, be sure to do the squelch mod documented on the >RB site. You will be very pleased with the results. >If you use a stock SAS board from a station, it will >cause a lot of pops and such in the audio as the COS >goes up and down when a station is picket fencing. >The squelch mod completely eliminates that problem. >You may find the caps already installed, but the .82 >cap needs to be replaced with the larger value. I've yet to try this mod., but am concerned that increasing C631 (C905 on the MVP) may degrade the fast squelch action, which is already a few milliseconds slower to release on strong signals than the Micor squelch. Has anyone measured the difference in short squelch mode before & after this mod? Bob NO6B
