Aiwa NSX-DS50 Operating Instructions Manual page 15

Adjustments
Antennas
Keep antennas away from metallic objects, electrical equipment
and cords.
EM antenna: Extend fully in a T-shape. If receiving condition
is poor, connect optional outdoor antenna to FM 75 Q
terminal. Be sure to connect the shield braid of the antenna to
the vb terminal.
AM antenna: Rotate to find best reception.
To switch to monaural FM reception
Press MONO TUNER on the remote control. With each press,
"MONO" and "STEREO" are displayed alternately on the
display.
Tip:
When FM stereo reception is poor, switching to monaural
reduces noise.
To switch the AM tuning interval
Hold down TUNER/BAND and press POWER. With each press,
the AM tuning interval alternates between 9 kHz/step and 10
kHz/step.
Tip:
The default is 10 kHz/step. Change it only when using the
unit in a 9 kHz/step area. Switching AM tuning interval clears
all the preset stations.
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