Rockbox Development > Feature Ideas
all region for the fm radio
Multiplex:
--- Quote from: bluebrother on July 02, 2008, 02:23:56 AM ---besides the frequencies limit there is also a setting on the chip (at least for the TEA5767) that is needed to tune in correctly (don't remember of the top of my head what exactly it did -- check the TEA datasheet)
--- End quote ---
I think that'll be the step size and start frequency, if they are not right you won't be able to get a good signal.
At the risk of going outside the purpose of this section there is a plugin (Patch 5448) that drives the radio chip in the H300 outside the usual parameters - it's pretty old but might be interesting to some of the commenters
MajiKool Dragonâ„¢:
--- Quote from: bluebrother on July 02, 2008, 02:23:56 AM ---This is not really possible -- besides the frequencies limit there is also a setting on the chip (at least for the TEA5767) that is needed to tune in correctly (don't remember of the top of my head what exactly it did -- check the TEA datasheet)
--- End quote ---
couldnt' you make the tuner software in the firmware adjust that as you tune? ???
bascule:
Did you not believe him when he says it is not possible? The difference is like trying to play an NTSC video on a PAL VCR - it doesn't work because they are different.
What's the big hassle between switching regions anyway, or do you live somewhere where you can simultaneously receive US and JP broadcasts?
TexasRockbox:
Many FM radios (but not all) from Japan cover the 76-108MHz natively allowing for reception of Japan TV audio channels 1-3. Otherwise 76-90Mhz is the Japan FM band. Japan made some wonderful component FM tuners for the domestic market but, sadly, these are virtually unusable in the USA.
Again, a wide frequency range (whatever could be received by the hardware) rather than territorial imposed limits could provide some some flexibility. If I recall, China uses some low power FM transmitters in the 70MHz region -- "college stations".
Multiplex:
But you still have the channel problem.
Radio frequencies are allocated in fixed step sizes from a starting frequency, and different territories have different start frequencies and different step sizes.
So you can be in territory A where they start at 90MHz and allocate in 100kHz steps (all numbers made up) but if your radio is configured for Tartary B where they start wt 85MHz and allocate in 75kHz steps you won't be able to tune into your favorite rock station at 90.2MHz
Ask my old boss - he saw a really nice car radio while on holiday in the US and brought it back but it couldn't tune to UK stations - Yes, I did laugh!
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