[TODO] Enable FM Transmitter

[7iain7]

I had a nokia n97 which had a fm transmitter,it was one of the most used functions of my n97. you could even out put the gps voice over the radio which was great if you had a noisy car.

 

[subset]

Can we use anyway FM Radio as TMC receiver ?

 

[kashavsehra]

I think you have hit the nail on the head there. unless the defy has suitable aerial which i doubt because you have to use headphone cable for the aerial.Might be wrong thought. hope i am because this was a great feature of nokia's

I don't think this is possible in terms of hardware, take a look at the following TI document:

http://processors.wiki.ti.com/index.php/OMAP35x_Wireless_Connectivity_Solution_Hardware

It can be seen in Table 5 that the FM TX and RX antennas come out on a separate pin, and are thereby it is not a shared antenna. The RX antenna is made from the headset cable when plugged in, and i very much doubt the TX antenna would be populated on the board, and probably not even tracked from the chipset!

 

[jeffokada81]

I think in theory this could be possible.
But as the range of the transmitter is max 10-20 meter, this would be
very limited
Maybe from one room to the other.

That would be perfect even at 2-3 meters for people who want to stream Pandora directly to an older car stereo with no bluetooth

 

[lefedor]

Just remembered about this topick. Any ideas/possibilities so far?

 

[thedoginthewok]

If there would be anything new, someone would have posted it.

Unfortunately I think it is impossible to use the FM Transmitter of the Defy.

 

[lefedor]

we have custom kernel now. can smb try to make it work?

 

[thekguy]

There are hardware limitations as well, as mentioned in the older posts

Sent from my MB526 using xda premium

 

[jh20]

wlan works without an antenna although the range obviously would be limited. so i can't see any reason why fm tx won't work without one. i also don't believe the tx signal would damage the output stage of the chip if without the antenna. it doesn't make electronics sense to me.....

 

[zopeon]

Here ..

I don't think this is possible in terms of hardware, take a look at the following TI document:

http://processors.wiki.ti.com/index.php/OMAP35x_Wireless_Connectivity_Solution_Hardware

It can be seen in Table 5 that the FM TX and RX antennas come out on a separate pin, and are thereby it is not a shared antenna. The RX antenna is made from the headset cable when plugged in, and i very much doubt the TX antenna would be populated on the board, and probably not even tracked from the chipset!

Kashavsehra has explained it very nicely. There is hardware limitation. Regarding the damaging of chip, normally an antenna is designed to have a matched impedance to the device output so that maximum power is transferred to antenna and none is feedback to device but if the antenna is not tunned (or absent in this case) reflection will occur and all power will be sent back to device potentially damaging the device. ( But in mobile phone FM transmitters this power is very small so it shouldnt)

 

[lefedor]

I'm not against little hardwware hacking if defy requires extra antenna ).

 

[sam_24]

I'm not against little hardwware hacking if defy requires extra antenna ).

i think this isn't a easy task or a "little" hardware hack, you need to desolder a solder a 423-Ball s-PBGA Package flawlessly.

to use the pin without an antenna is unless, the chip is ground - shielted. -as seen in the picture-

i teared down my defy once: Picture

i'm not realy into software stuff, but i think this is nothing, that can be accived in a few minutes or hours.

I don't want to take your motivation, i would realy like to see it run on the defy
Feel free to make it work :good:


Sam