Transmitter and receiver can hardly work at the same time.

One problem that I ran into is that the FM radio application only works when the headphones are plugged in. It uses the headphones as an antenna, but you can still use the stereo speakers on the N900. The transmitter, however, only works when the headphones are not plugged in, so I couldn’t test running the transmitter and the receiver at the same time.

It is quite probable that the FM transmitter would, if it were operating at the same time as the FM receiver, desensitise the FM receiver, causing its Automatic Gain Control (AGC) to wind down thus preventing good signal reception, even with the transmitter and receiver tuned to different frequencies.

But:
The transmitter can also receive the signal level on the tuned frequency. This enables transmitter application to scan all frequencies, checking for vacant ones, and suggesting empty frequencies to the user for selection as transmission frequencies.

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So, has anybody done an application which would push the frequency of the transmitter to the next free frequency?