I thought I'd dig this one out because I'm about to take a motorway/freeway trip tomorrow and have to take the car which doesn't have an aux input on the radio, so that means using the N900 FM transmitter. Being a long trip, this will invariably mean changing frequencies on both the N900 and radio from time to time to keep the frequency clear. This wouldn't be so bad if I could convince the wife to drive, but it'll be me driving as usual, so I won't be able to keep fiddling with the frequencies without pulling over every dozen miles or so.

The original poster was onto a good thing with this and it was working out, but the thread kind of fizzled out when discussing using fmboost.

There is still a good case for developing a program to scan for clear frequencies. This could either be used to build a map of clear frequencies on specific frequently travelled routes (motorway networks perhaps), or as was suggested, perhaps to use RDS to enable the FM transmitter to renegotiate the 'station frequency' on the fly. I presume that the N900 is not capable of transmitting and receiving simultaneously, anyone know this?

Changes of designated frequency could be triggered by GPS location if a community created 'clear frequency map' was developed from the pooled N900 users frequency scans. The resultant frequency map might be used as the basis for the development of similar applications on other platforms, a bit like those dynamic speed camera databases.

It's all too complicated for me to even contemplate, but it would be dead neat if it could be made to work.