The Motorola Radius GP 300 was designed to be a business-class
portable targeted at business, industry, school districts, and
other non-public-safety users.
The Motorola HT 1000 portable was designed to be a public-safety
grade portable, and as such is built much stronger than the GP 300.
The HT 1000 also supports many more signaling formats than the GP
300 does.