Occasionally you may want to watch for an infrasignal who’s frequency you’re not quite sure of. You don’t want to scan the whole frequency band, because it takes over one and a half minutes to scan the 16 channels and you might miss an abrupt signal.

First, determine the channel number of the frequency you’re not quite sure of. Touch the OPTIONS >> USER GUIDE buttons. Go to PAGE 5. In the paragraph “5 CHANNEL SCAN.” there is a list of channel numbers and corresponding upper and lower frequencies. Select the channel number that most likely covers the right frequency. Touch the GO BACK TO MODE >> 5 CHANNEL SCAN mode buttons, if not already selected. Then use the left <CHANNEL or right CHANNEL> buttons and continue to touch until the channel number indicated on the status bar is the one you selected from the list.

The scan will start on the channel you selected. It will scan to the right, then scan to the left, back and forth across the five channels. You can speed up the scan by touching SCAN FASTER, but with a tradeoff. The signal strength measurement may not peak as strong and you may miss a very weak signal.

When an infrasignal appears in a channel off to one side of center, the scan can be adjusted using the left <CHANNEL or right CHANNEL> buttons.

To monitor the infrasignal, touch the 1 CHANNEL ON CHART button when the proper channel number appears on the status bar.  To measure its frequency, touch 1 CHANNEL ON SCOPE >> MEASURE FREQUENCY.