To enable LSB on the Furuno Model FS1503 radio do the following:
You need to change system parameter 9914 to "0" to enable LSB capability.
System programming procedure:
While pressing and holding down the [CH] key, turn the power on to enter system programming mode, release the [CH] key after unit is on and "MEMO" shows in the display.
Select function 9999 by rotating the FREQ/CH knob.
Press [CH], [1], [5], [0], [3], and [ENT] keys. ("1503" is password.)
Select function 9914 by rotating the FREQ/CH knob, then press [CH], [0], and [ENT] keys.
To finish up, escape the programming mode by simply turning off the radio.
The system programming is completed.
