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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 03-30-2007, 06:27 PM   #1
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Default Irritating Hissing Sound

Hello fellow Sirius fans...

I've been a subscriber for over two years now, and thouroughly enjoy the programming I receive. However, I recently upgraded my radio module to the Sportster 4, and am having some difficulties removing the hiss noise. I wired it myself and was very satisfied with the job I did, but when I turned on the radio, every frequency I tested contained that annoying hiss sound. I "unhid" the wire so it was just a pile of wire and for some reason that made the sound a bit clearer. But obviously I do not want a pile of wire in my car.

So I just rewired it a different route, but the hiss is still there. Is there ANY possible way I can decrease this annoying noise or even remove it? I realize satellite radio is not as clear sounding as FM, but I don't remember having this problem with my last Sirius radio. Any help is appreciated, and I thank you in advance.
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Old 03-30-2007, 06:47 PM   #2
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You don't say what your last radio was, but if it was purchased before last summer, then the onboard FM transmitter was a lot stronger than the one that is currently in your Sporster 4.

The earlier transmitters were stronger than was allowed under the FCC's part 15 rules. They worked great, but there were interference complaints and the FCC clamped down. The transmitter in your Sporster is now 'legal'.

As you've noticed, there isn't enough signal to give you a strong hiss free sound. What most people do is add an FM direct adapter. This allows you to connect your transmitter directly to your car stereo. This provides a much stronger signal. (The FM direct adapter is described on page 17 of your Sportster4 user manual).

Here is a link to a place that sells the adapter.

http://www.tss-radio.com/direct-adap...ay-p-4082.html
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Old 03-30-2007, 06:52 PM   #3
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Quote:
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You don't say what your last radio was, but if it was purchased before last summer, then the onboard FM transmitter was a lot stronger than the one that is currently in your Sporster 4.

The earlier transmitters were stronger than was allowed under the FCC's part 15 rules. They worked great, but there were interference complaints and the FCC clamped down. The transmitter in your Sporster is now 'legal'.

As you've noticed, there isn't enough signal to give you a strong hiss free sound. What most people do is add an FM direct adapter. This allows you to connect your transmitter directly to your car stereo. This provides a much stronger signal. (The FM direct adapter is described on page 17 of your Sportster4 user manual).

Here is a link to a place that sells the adapter.

http://www.tss-radio.com/direct-adap...ay-p-4082.html
Thank you for the help!

But I have to ask... would my old FM transmitter work with the Sportster 4? If not, then I will most likely be purchasing this device you have suggested.
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Old 03-30-2007, 07:01 PM   #4
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Quote:
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Thank you for the help!

But I have to ask... would my old FM transmitter work with the Sportster 4? If not, then I will most likely be purchasing this device you have suggested.
The transmitters are built in to the Sirius receivers. They are an integral part of the radio circuit boards -- you can't just unplug a transmitter from one radio and put it in another.. So.. no.. your old transmitter won't work with the new radio.
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Old 03-30-2007, 10:15 PM   #5
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I had a hiss sound on my radio and needed to lower the FM volume on the unit to get it to sound right. I have it installed with a FM mod.
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Old 04-08-2007, 06:29 PM   #6
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If you don't want to have your dashboard taken apart and want to boost the strength of the FM transmitter - see this Thread, which will refer you to another website. Follow the very easy directions and make a very cheap antenna to boost the strength of the FM transmitter. I did this, took me like 10 minutes, if that, and now no more static. It works much much better then the FM extender which Sirius is supplying with the new radios. It cost me about 7 dollars to buy the stuff needed from Radioshack and make two of them for my car and my wife's car.
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