Yes. Set them to different commands. Otherwise you will experience the problem you are having. My scan zone is set to "CTRL-;" and "CTRL-." The TDC is set to ";" and "."
For me it seems correct more often than not. What most people forget is that the vertical scan altitude readings are tied to the TDC. SO you are seeing the vertical scan limits for the range at the TDC's location (range).
Rich
An Indian Air Force SU-30 Fighter lands at Nellis Air Force Base, Nev., August 6, 2008 for participation in Red Flag 08-4. This marks the first time in history that the Indian Air Force has participated in a Red Flag exercise here at Nellis. (U.S. Air Force Photo by Senior Airman Larry
http://www.nellis.af.mil/news/story_media.asp?id=123109974
try this file and place into LockOn/Bazar folder (make backup first)
[ATTACH]18763[/ATTACH]
let me know if you stil get bad framerate when you fly over same area... or anywhere on server for that matter...
EDIT: Also note to mission builders... if you place say 20 hummers within 2km or just make a column with quite a few hummers (or even M113) in it they will make for quite a few objects for CPU to render... if 1 hummer takes 68 objects and you place 10 of them that's... 680 objects just for those (or 800 for 10x M113) ... and even on fast CPU (for example 4GHz C2D I have) something of order of 4000 objects is what will start to lower my framerate bellow 60... something to consider I guess when making missions.
Ideally having 3 LOD for each vehicle would do from high/medium/low poly and then 4th LOD just simple box, square or whatever would fix this even better... but hey this is what we're getting DCS for... beauty of all the high quality 3D models of upclose then multiple LOD's as they blend into distance... nice :)