The Fm modulator is installed behind the head unit. The line out from
the device(sat radio, mp3,ipod,etc) runs to an adapter cable, then to
the fm modulator. The signal leaves the modulator through another cable
adapter to the headunit. The cars antenna plugs into the fm modulator
as well. The modulator also supplies power to my xm radio but that is
specific to the XM unit.The fm mod unit has several frequencies which
can be changed to get the cleanest signal. The modulator also has a
shield to prevent frequency bleed over in areas whre there is a lot of
fm signals to interfere. Inmy community this isn't an issue but when I
drove to DC I couldn't use the broadcast fm modulator in my Roady@
because I couldn't find a free frequency..I leave the headunit set to
87.5 whenI use the XM. Additionally,I can use the set up to play an MP3
but just pulling the line out(headphone) plug from the xm and plugging
it into the mp3 headphone plug.It plays thru the radio just like the
XM.
I recommend professional installation unless you are comfortable
pulling out the radio. I'm not.
Cheers again
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