RS + does not maintain good SNR

Question. So in setting up my base, there are options for single, float, fix. After starting the unit it notes, waiting to fix. What your saying is that unless I also have a Rover set up and operating I will not get a fix on the base?
If I manually input coordinates of a known control point, my rover should pick up corrected information from the base correct? The issue I have when I do that is that my baseline shows something like 7000 meters greater distance than it actually is. Any thoughts?