Radio scanner This is a quick guide for the Realistic Pro42 radio scanner To Operate. The scanner will start scanning, when you turn it on. Scan button is top left. Manual button is just below the scan button. Program button is just to the right of the scan button. Dot, or period button is the second one in from the bottom right. The enter button is bottom right. The number pad is the last 3 keys on the right side of the group of buttons on the face of the scanner. To Program a Frequency. 1 Press manual to take the scanner out of scan mode. 2 Sellect the button from the key pad on which you would like the new frequency to appear. 3 Press the program button. 4 Type in the new frequency, using the dot or period key where needed. 5 Press the enter Key. Programming is complete.