Wthe are the main differences between the PSM900 and PSM1000?
Here are the primary differences:
PSM1000 - tuning range is 72 MHz (36 MHz - PSM900)
PSM1000 - dual transmitter (P10T) in one chassis
PSM1000 - receiver (P10R) has antenna diversity (non-diversity - PSM900)
PSM1000 receiver (P10R) and PSM900 receiver (P9RA) - operate on AA alkaline or optional rechargeable power packs - model SB900; (PSM900 receiver P9R, AA alkaline batteries only)
PSM1000 - receiver (P10R) and PSM900 receiver (P9RA) - receivers have longer battery life than original PSM900 (P9R) receiver