An FM modulator allows you to install components like a CD changer to a deck that doesn't have the "Line-level" inputs to hook the changer up directly to the deck. Instead, the modulator converts the "line-level" signal to a FM frequency that your FM stereo can pick up. There are times you need to modify the FM modulator to play the signal on a frequency that isn't being used in your area. If your modulator is set up for 99.1 and there is a local station that broadcasts on 99.1, you will need to modify the modulator to playback on an open frequency.
Instructions
1. Find an open frequency on your FM dial. Some FM modulators have preset frequency that you may need to find, others allow you to choose any frequency on the FM dial. Locate that frequency in your area where there isn't any signal being transmitted and write it down.
2. Set the FM modulator to the frequency you will be using. Some modulators have a switch that will allow you to select a preset frequency. Other modulators have a dial or buttons up and down to scroll through the FM frequencies available. Select the frequency you need.
3. Turn on your stereo and tune the FM dial to the frequency you selected. Play the unit connected to the modulator to see if the signal is coming through the channel you selected.
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