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Install Garage & Help Desk You've got the radio, now which cable goes where? Got questions about factory installed radios in your car? Ask any installation or help questions here and someone will get to you soon.

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Old 12-01-2006, 04:50 PM   #1
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Join Date: Dec 01, 2006
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Default FM Out

Can anyone give me some detailed electrical information on the FM out port.
I have a Starmate replay.
I measured the voltage out of it and it appears to be around 3.0 VDC.
Anyone know how much current it can put out. Maybe I can put a power amplifier so I can get better reception. Or the other option I thought about is to turn off the voltage output so I can hook up a passive antenna for signal improvement.
I have not been able to find any schematics for it.

Thank you for any help.
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Old 12-01-2006, 05:05 PM   #2
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It is for the FM Direct Adapter that is sold at most SIRIUS retailers, including TSSRadio. It connects the satellite radio to the car radio and is only $20.
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Old 12-03-2006, 08:32 PM   #3
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You can also attach a pice of wire as an external antenna.

One came with my S50 and it definately helps the signal.
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Old 12-04-2006, 03:54 PM   #4
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As realwx said, the voltage - I think - is to turn off and on the FM modulator that you can buy to add this setup to a head unit without an AUX-IN anywhere on it. I have this setup in one of my vehicles (a GM with OnStar and XM), and it works great. Beyond great given the weak FM transmitter in the Sportster 4 anyway.

As Fredk said, it is also possible to just add a passive wire antenna to a sub-mini plug to extend the FM range of the built-in transmitter. Some people have better luck with this than others, but most admit it does help somewhat. You don't have to disable the voltage - not that I think you can anyway - to use this method.

I think I'd rate the ways to connect Sirius to car's head unit, in order of clarity, as follows:
1 - Direct L/R audio AUX-IN connection
2 - FM modulator
3 - Plain FM transmission/w passive antenna lead coming from Sirius FM OUT.

Some sort of helper antenna is necessary when talking about the new Sportster 4s. I have one, and it can't get a clean signal no farther away from the unit than a foot or two IMO, without a modulator or some other form of help anyway.
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