A company in the US has a kit for a digital tuned FM stereo transmiter. the company can be found here. http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=FM25

I also would like to construct a box to use my player in other cars.

check www.riocar.org I would like to controll the transmit frequency thru the empeg.
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