maemo.org - Talk - FM Transmitter Mod

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- - FM Transmitter Mod (https://talk.maemo.org/showthread.php?t=46953)

Re: FM Transmitter Mod

Quote:

I am really interested in this - create and I'll vote!

Me too...................!

Re: FM Transmitter Mod

i was going to ask same question. using 87.5 would be perfect

Re: FM Transmitter Mod

please someone help us! we need 87.5! or dots.pair frequencies

Re: FM Transmitter Mod

Yay! Got it!

According to the drivers documentation found on http://www.mjmwired.net/kernel/Docum...nux/si4713.txt the transmitters lower range is 76 MHz. However, the limit on mine is set to 87.5 MHz. I guess this depends on where you bought the device as 87.5 is also the lower limit here in Germany.

You can check the limits on your device/region by executing

Code:

cat /sys/class/i2c-adapter/i2c-2/2-0063/region_bottom_frequency

The transmitters properties (such as the current frequency) can be changed using a tool called v4l2-ctl. I have found a binary compiled for the N900 in this thread:
http://talk.maemo.org/showthread.php?t=46427
Go there, download and install the provided package (lfocus).

After installing lfocus you should have the tool v4l2-ctl installed in /usr/share/lfocus/v4l2-ctl.

Now start your FM transmitter. v4l2-ctl will work only while the transmitter is on.

Set the frequency by executing the following command as root:

Code:

/usr/share/lfocus/v4l2-ctl -d /dev/radio0 -f 87.5

This will set the frequency to 87.5 MHz. Change the value to your desire within the valid range.

PLEASE INFORM YOURSELF ABOUT THE LOCAL REGULATIONS FOR FM TRANSMITTERS AND MAKE SURE THAT YOU DO NOT VIOLATE THEM!!!

Optionally you can change fm-boost to switch frequency every time by adding the above command in the file /sbin/fm-boost. Make sure you insert it after the "#!/bin/sh" and before "exit 0"

Here is an example of mine:

Code:

#!/bin/sh

/bin/echo 120 > /sys/class/i2c-adapter/i2c-2/2-0063/power_level

/usr/share/lfocus/v4l2-ctl -d /dev/radio0 -f 87.5

exit 0

If you are using simple-fmtx-widget and have set it up to execute fm-boost you can now turn on your fm transmitter and immediately tune it down by just tapping the widget.

Have fun!

Re: FM Transmitter Mod

great it works for me, but i had to run v4l2-ctl command while fm transmitter is on. When off i get "no such device" error in terminal!

Re: FM Transmitter Mod

Quote:

Originally Posted by ToJa92 (Post 561736)

I don't think the radio transmitter chip in the N900 is able to go below 88.0 anyway due to laws and such.

sorry but if the law is the problem, then the WiFi functionality has to be limit to 11 channels!

the producer of the hardware (or in this case even the software) isn't responsible for what the user does with the equipment.

Re: FM Transmitter Mod

hmm on now the only thing left to do is to put this in the normal repository and put a nice GUI around it.

Re: FM Transmitter Mod

could add it too Simple FMTX desktop widget v0.5.0

Re: FM Transmitter Mod

For those interested, here's my post about this subject when it came up awhile ago. Nokia's official position is to leave it as is due to legal reasons. If you live in the US, making this change is probably breaking a federal law and subject to fine and confiscation of your N900. :eek:

Just FYI. ;)

Re: FM Transmitter Mod

Quote:

Originally Posted by Flandry (Post 593161)

hi, i bought the zune player with the fm transmitter in new york when i went and that went down to 87.5 thats why i wanted the phone to go as low as that, so im sure they will be alright with it