maemo.org - Talk
Page 3 of 30 12 3 4513 Last »
Show 40 post(s) from this thread on one page

maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   N900 Radio Transmitter: ways to amplify the radio signal (https://talk.maemo.org/showthread.php?t=38582)

smage 2009-12-28 21:42
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:
Originally Posted by go1dfish (Post 444328)
Found this today: https://bugs.maemo.org/show_bug.cgi?id=6792#c9

When FM transmitter is on, the following sys file is present:

/sys/class/i2c-adapter/i2c-2/2-0063/power_level

You might could try fiddling with this value and see what happens. Of course you do so at your own risk and I take no responsibility for you frying device or getting frog-walked/fined by the FCC.

Also would be curious to know what the value in this file is for different people:

With fm transmitter on do (this will not change anything, it's just a way to see what the current level is):

Code:
echo /sys/class/i2c-adapter/i2c-2/2-0063/power_level
And report back what number comes back, I get 112 (also the number referenced in that bug report)

112 here as well.

go1dfish 2009-12-28 21:47
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:
Originally Posted by smage (Post 444352)
112 here as well.
Might be helpful to include firmware localization as well

I'm at 112 on US firmware PR1.0

That One Guy 2009-12-28 21:52
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
I'm sitting at 111.

jsharper 2009-12-28 22:26
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
mine was 111 with US firmware. The datasheet (http://www.datasheetdir.com/SI4713+Rf-Transmitters) lists a programmable transmit output voltage to be 118dBuV typical with a test condition of 102-118 dBuV for the accuracy spec. I'll go out to the car in a bit and see if I notice any diff setting this to 118.

Interestingly, /sys/class/i2c-adapter/i2c-2/2-0063/region_bottom_frequency contains 87500 but the GUI only goes down to 88.1 .. i'd love to be able to use the 87.5-87.9 freqs too...

jsharper 2009-12-28 22:35
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Ok, I noticed a decent improvement of 118 over 111 or 112. It cut the static down quite a bit...

Anyone find a way to manually control the tx freq to force, say, 87.9?

go1dfish 2009-12-28 22:40
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:
Originally Posted by jsharper (Post 444445)
Ok, I noticed a decent improvement of 118 over 111 or 112. It cut the static down quite a bit...

Anyone find a way to manually control the tx freq to force, say, 87.9?
Did it keep your changed power level after a disabling/reenabling of the transmitter?

After a reboot?

jsharper 2009-12-28 22:42
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
no, as soon as i turned off the fm transmitter, power_level got set back to 111. you'll need to find a solution to keep setting it

wizbowes 2009-12-28 22:48
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
112 - in the UK.

Have rotten reception - none in the car (Saab 95) and dreadful on my one remaining FM radio in the house - has to be touching the radio to work.

imei 2009-12-28 22:50
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:
Originally Posted by ceza_21 (Post 443352)
i use 107.3 in cambridgeshire area and east london.sound quality is quite good in my volvo v70...
Do You have original volvo radio? I have SC-816 with rear side window antenna and when n900 is on dash FM transmission is very poor quality...

anidel 2009-12-28 23:15
Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Firmware 51-1 here and the value now is 118 on the pre-production device and 113 on the Summit one.
Kinda weird.

It's set a 90.5 on the Summit one and 88.1 on the pre-prod one.

If I disable the FM Transmitter, tough, that profile is still there.


All times are GMT. The time now is 14:00.
Page 3 of 30 12 3 4513 Last »
Show 40 post(s) from this thread on one page

vBulletin® Version 3.8.8