Help remove fm attenuator

hello, ive bought a car mp3 fm transmitter, but its hissing.
can you help me removing the attenuator?
thank you

well, maybe... Do you have a make/model number, circuit schematic, picture of the PCB, know what part it is... or in some other way can you show us what device you are working on?

We can't see what you see, so you kinda need to give us something to work from.

ok ill post a picture as soon as Ill return home . thanks !

I do not think there is any attenuator to remove. I used a Belkin FM transmitter in my car without problems. You only should tune your radio to a free channel without any external signal, and locate the transmitter as close to car antenna to get a clean signal. Some hiss or distortion may also come from the MP3 player connected to the transmitter. Some MP3 players have earphone and "line" output. The latter is better.

Thanks for the suggestions, but,
1.here in Athens/Greece, there is not even 0.1MHz free in the FM band!
2.I live around 10km from the transmitters and I can see the antennas....
3.If only my crap car would have a line in Id definately have used it instead of buying that fm thing!

I am sorry but this situation simply would not allow you to use the transmitter with your car receiver. Instead, use a direct cable connection to audio input in your car. If you have a cassette player in your car, I have a fake cassette with an induction coil to get an external audio in the radio.

Maybe you could disconnect the radio from the external antenna, and use a small antenna (or piece of wire) inside the car instead, close to your MP3 transmitter.

Possibly, your radio front end is overloaded due to strong nearby transmissions due to lack of tuned filters (car radios are not super-high quality usually).
The cheaper alternative might be just to replace the radio with one with an aux line input : ( Or to disconnect the external
antenna as suggested above.

If your FM transmitter has an external antenna, you could try connecting a wire to it, then wrapping the other end of the wire around the coax cable for your car's antenna. You may couple a bit more energy into the antenna wire and give you a small boost. Granted, you are coupling the signal onto the ground, but it may give you a little differential mode signal boost that the radio's amplifier could use.

Along the lines of disconnecting the external antenna, you could try adding a switch to the antenna line. I wouldn't cut the existing antenna coax (unless you are skilled enough and have the tools to install coax cable ends), but you could get an extender wire (one male, one female end), cut it and install a DPDT switch in between (one pole of signal, one for ground). Then, the other side of the DPDT switch could be wired into the output of your FM transmitter.... probably with a 20 dB attenuator, or more, so you don't burn up the receiver circuits of your radio. Just an idea.... at 100-ish MHz, it may work reasonably well.