Channel bandwidth spacing does not change. It can and should remain at 12.5 kHz. Time division must be used with a repeater so the link rate will be reduced by half and only half as much data can be sent and received. Because of this, a modulation with a higher data rate needs to be used (D8PSK or D16QAM).I'm told that each time you repeat, (radio repeater), that you loose 1/2 of a band width. So, a t3, (1 watt uhf) could push to repeater, 1/2 mi away, but now repeater is at 6.25 band width.