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== Limitations ==
* The relatively low power output of FM transimitters sometimes makes it unsuitable for use in some large urban areas because of the number of other radio signals. This is compounded by the fact that strong FM signals can bleed over into neighboring frequencies making the frequencies unusable with the transmitter. Removing a car's radio antenna has been found to significantly improve transmitter reception.<ref>[http://barnacle.godsong.org/ask_the_box/0000192.html q the z: not a blog]</ref>
* Some models which connect via ports other than the headphone jack have no means of controlling the [[loudness|volume]], which can force the sound to transmit out from the device harshly (causing overmodulation, audio distortion and possible radio interference), or too low. In theory a device could use an [[Automatic gain control|automatic level control]] or [[Audio signal processing|audio limiter]] circuit to overcome this problem although there are few (if any) devices with such a facility available on the market yet.
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