Flip the SWR Switch to the CAL position. Fig. 1

Key up the radio and adjust the SWR Cal Knob until the needle lines up with the little orange triangle in the Upper Right hand corner of the meter. Fig. 2

After the meter is properly calibrated, flip the switch to the SWR position. Fig. 3

Key up the radio and watch where the meter goes on the top scale.  If the needle remains at the very far left of the display, this is considered a 1.0:1 SWR.  If the Needle moves to the W in SWR, this is considered a 1.5:1.  If the SWR needle goes above a 3 on the top scale this is considered a bad SWR and Needs attention.  Using a radio with a high SWR (over a 3.0:1) can and will damage your radio. Fig. 3

Once you know you have a good SWR go ahead and flip the Switch into the Top position labeled S/RF position so that the Meter will work to show you both your transmit and Receive relative signals.  When you key the radio up, the needle should line up with the 9# signal mark on the Bottom scale, unless the radio has been modified. Fig. 4

When you transmit the top LED should turn from green to red when you key up the radio.  The bottom LED is the antenna warning LED and comes on when you transmit if your antennas SWR Becomes unacceptable to use.