There are two different buttons on the control panel at the bottom of the screen, one for the attack scope and one for the observation scope, and as far as I recall without having the sim running, insert and delete keys raise one and page up/down raises and lowers the other. Don't use the observation scope much myself.
Not doing anything wrong with the radar I presume. It's bugged at the moment.
Of course if you are early in the war, you might not have fitted one, but the stations will still be available even though they don't do anything because you aint got the thing fitted. There are some quick-fix mods that sort the radar out a bit (see the mods threads), or you can simply do what many people are doing; which is, wait for the patch whilst playing without radar, or play SH3 while you wait...
Chock