Sangean ATS-405, Manual

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Bandwidth selection (B-W)
. Narrow bandwidth can get lower noise and higher
sensitivity while wide bandwidth can bet better
frequency response under stronger RF signal.
2. The filtering bandwidths are listed on below table.
While receiving FM RDS station, the bandwidth will
be automatically adjusted to wide bandwidth
3. While radio is on, select required waveband, press
B-W button to cycle through Bandwidth from wide,
normal (for SW and MW wavebands only) and narrow.
On display, bandwidth icons will change accordingly
and you can fell the difference on the noise and
reception while changing the bandwidth.
Local/DX
When listening to AM/SW/FM broadcasting, this switch
adjusts the receiver's sensitivity.
When you listen to a strong station and the signal is
slightly distorted, set the switch to the LOCAL position
for best reception. For normal or weak stations, set the
switch to the DX position for maximum sensitivity.
Bandwidth FM SW MW (AM)
Wide 0k 4k 6k
Normal x 2k 3k
Narrow 85k k .8k