Burns Fisher finally straightened me out with the Duplex Operation section on page 1-14 of the Advanced manual. The Memory section (chapter 4) isn't helpful. SPLIT mode can't be used. You must use the semi-hidden Offset Frequency menu. Here's a summary of the steps:

FUNCTION, page 2.

Tap DUP key to set offset to -.

Hold DUP key for one second to open the Offset Frequency menu.

Enter 1.31 MHz.

Tap the ENT key. Offset menu closes.

Save to a memory. The duplex offset is stored.

It works! Easy once you know how. Receive on 145.8, transmit on 144.49, in a channel memory.

Thanks again for everybody's help.

Wayne Estes W9AE