AM Restrictor
AM reception has been improved on the F01/F02.
Due to the great distances with relatively few radio broadcasting towers, in less
populated areas of the US AM radio is more accessible than FM radio.
Interference frequencies from the vehicle electrical system pose reception problems in
terms of the quality of AM radio. In an unrestricted antenna system, these interference
frequencies spread from the vehicle electrical system through the power supply to the
rear window defogger into the antenna system.
The AM restrictor was specially developed to address this issue.
The AM restrictor supplies voltage to the upper section of the rear window. In addition,
the rejector circuit components provide sound quality filtering.
The main component is a coil which acts as an extremely high resistance to RF signal,
resulting in significantly improved AM reception.
Restrictor circuit AM for the rear window
Index Explanation Index Explanation
1
Interference suppression
coil for AM range
4
Ground supply from vehicle
wiring harness
2
Positive supply to rear window
5
Ground supply to rear window
3
Positive supply from vehicle
wiring harness
84
F01 Audio Systems
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