Use the FMboost app - helps ALOT!

Had the same issue until I tried the boost, which sets the tx to 118 - still inaudible in some vehicles, but works really well in others.

i've got the same problem as well, and couldnt find a solution for it either (from a previous thread - cant seem to find that thread now though). so i'm stuck without it.. i imported the N900 from the US and i live in Australia, so no chance of me claiming warranty here

someone suggested pressing the left part of the keyboard (near the Ctrl or Function keys) and that has worked. maybe you can give that a shot?

Dunno if it helps, but the n900 powers down the transmitter when charging. You need to use FM-boost to boost it back up again once charging has started.

download fm transmiter faker from repository

as i wrote that i have tried fm-boost, different radios and different frequencys. still the fm-transmitter is dead

try old school radio

Execute the following commands as root from command line and see if you get any error message

cannot create : permission denied

Did you run as root?

i typed sudo gainroot again and now it got through without any errors. still its dead