sp5it pisze:

1 With the 850 turned off, press and hold the "SCAN" and the right "M.Ch" buttons simultaneously while turning on the radio.
2 Select menu 1 by rotating the "M.CH/VFO.CH" knob.
3 Turn the option to "ON" by pressing the "UP" button.
4 Press the "CLR" button to exit the power-on menu.
5 On SSB transmit, you can now select the following filters in the 8.83 MHz i.f. resulting in the following on-air bandwidths (with the DSP-100):
SSB
None = 6 kHz TX bandwidth (with DSP-100)
6k = 4.5 kHz TX bandwidth
2.7k = 2.4 kHz TX bandwidth