My first post. The TCAS aircraft I have flown displayed aircraft within 2700' of my altitutude (assuming all transponders are accurate), within an option to increase this to 10000'. Are most other, particularly RPTs, similiar? If this is the case wouldn't the DJ crew have seen the aircraft on their display some time earlier than the TA aural warning? If it was displayed 3000' earlier this would have been around a minute prior to receiving a TA (assuming about 2000 fpm RoD).