On the web I have found a lock detector circuit for the 4046. I may build this someday. For Now I use a TX delay when repeaters are used.
A good low noise preamp may help to improve sensitivity. The sensitivity is not bad but my yeasu is better.
I hope the sensitivity can reach the same level. Then I can use the repeater in Bregen op Zoom PI3BOZ.
I made a few qso's with it in local radio ralleys. Most reactions were positive. Some have complained that FM deviation is still a bit low.