SIRIUS XDRC2UG - Manual (Page 51)

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If the signal reception is good, but there is no audio when tuned to channel
1, verify that Xpress
RC i ’s FM Transmitter is On (step 6), and that both the FM
Transmitter and your vehicle’s FM radio are tuned to the same FM channel
(steps 5 & 7) . Also ensure the chosen FM channel is a suitable one to use in
your area (step 5) . Verify that nothing is plugged into the AUDIO connector
on the PowerConnect Vehicle Dock . Refer to “Troubleshooting” on page 110 for
additional help .
Option 4: FM Direct Adapter (FMDA) Installation
The FMDA needs to be installed by a professional installer . Professional
installation can help improve your radio’s reception and significantly reduce
the visibility of wires . To learn more, check with the retailer where you bought
your radio, or go to xmradio .com/accessories .