Uniden BC250D Owner's Manual page 90

You will not hear any audio. This feature does not function in
the WX Alert mode, because the audio is already muted. To
turn it OFF, press and hold MUTE again.
Receiving Mode Selection
You can also set the receiving mode, AM or FM etc., in
Conventional mode or Chain Search mode.
See MODE in "Menu Description" for details.
Frequency and Channel Tuning with the VFO
Control
The VFO knob can be used for stepping through frequencies
or stepping through memory channels (for Conventional
channels or Talkgroup ID Scan Lists).
To switch the setting for the VFO control, press and hold
HOLD/MAN for 2 seconds. This will change modes from
Channel to Frequencies or Frequencies to Channels.
1. In Conventional mode, when the setting for the VFO is
channel, rotate the VFO to move up (to step up through
channels) or down (to step down through channels). If you
are in Trunk Manual mode, you will step through Scan List
memory locations.
2. In Chain Search mode, when the setting for the VFO is
frequency, rotate the VFO to move up to step up through
frequencies sequentially or to down to step down through
frequencies. To change the step, you will need to go into the
Chain Search menu and adjust the step for the desired
memory location.
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