Usability and Accessibility The DX-390 manual emphasizes pragmatic clarity:
Here’s the direct information you need: radio shack dx-390 owners manual
The radio can display both local time and UTC (Coordinated Universal Time) , which is essential for tracking international broadcast schedules. radio shack dx-390 owners manual
A unique behavior of the DX-390 is that the RF Gain control only works on shortwave (SW) when using the built-in whip antenna. However, if you plug in an external antenna, the control suddenly works for both SW and AM. External Antenna Jack: radio shack dx-390 owners manual