From The RadioReference Wiki
TK-280 VHF LTR Trunking Capable Radio
Type 1 146-174 MHz
Type 2 136-162 MHz
TK-380 UHF LTR Trunking Capable Radio
Type 1 450-490 MHz
Type 2 470-512 MHz
Type 3 400-430 MHz
These are virtually the same radios. The 280 is VHF and 380 UHF
The VHF model has 5 watt and the UHF model has 4 watt transmit power.
600 Channels in Trunked Mode 32 System and 250 Group Memory Capacity in Conventional Mode.
These radios are very easy to program. Using Kenwoods KPG-49D software. The Programming cable for these radios is KPG-36.
The TK-280 w/the 146-174 split, will program down to 144MHz.
The Software actually rejects the frequency, but it doesn't erase it.