Question:  I have two Tempest 2400 systems version 3.00 that I have co-located in a RF overlap zone.  The base stations are approximately 500 feet apart from each other.  I have the beltpacks registered to both base stations and am using the I-Select roaming feature to switch the beltpacks from one base to the other.  When I attempt the switch over the beltpacks from one base to the other base they will not switch until I power cycle the beltpack.  The network and lockout numbers on both bases are set to 00 and 255 respectively.  Why am I having problems?
Answer:  With each base stations network and lockout set to the same numbers the beltpacks are going to have problems switching manually from one base to the other because the RF hopping patterns are the same and causing each base stations RF carrier to interfere with the other.  To rectify the situation change the network number on one base station from 00 to 01 or 02 (The network number for a version 3.0 system group can be 00 to 10).  Also change the lockout code to a different number (254 or lower). 
Once this is done repair the beltpacks to the base station so that they can "register" the new network/lockout numbers.  The beltpacks will now be able to manually select via I-Select roaming the base station of choice, and you should notice that the RF range will be improved since each base station is no longer interfering with the other base station.