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

anidel 2009-12-28 23:17

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Btw, it sucks on both.

Today I used my K850i from SE as Radio (it also has RDS).
I had to place the N900 right on the headset cable (the 'antenna') to have clear audio in the 'radio' (the K850).

If I kept the N900 in my hands, sitting at the table, thus few cm away from the 'radio', the quality would drop a lot.
Rotating the N900 did affect the quality (from nothing to good quality) of the audio in the 'radio'.

And I was in my room... not in a shielded car.

LozBlake 2009-12-28 23:20

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Hey, i'm from the uk and i'm at 113, curiously as soon as i plug in the charger it drops down to 88, do you think changing it back up would solve the issue of the transmitter being unusable when charging?

I use my transmitter in my C3 at 107.3 with pretty decent reception, i occasionally get a bit of static, mainly when other pirate stations cross the frequence. I drive in the essex area and about the north m25 with my n900 sitting besides my steering wheel.

go1dfish 2009-12-28 23:22

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:

Originally Posted by LozBlake (Post 444531)
Hey, i'm from the uk and i'm at 113, curiously as soon as i plug in the charger it drops down to 88, do you think changing it back up would solve the issue of the transmitter being unusable when charging?

I use my transmitter in my C3 at 107.3 with pretty decent reception, i occasionally get a bit of static, mainly when other pirate stations cross the frequence. I drive in the essex area and about the north m25 with my n900 sitting besides my steering wheel.

Yes, this information was gleaned from a Bug relating to that exact issue:

https://bugs.maemo.org/show_bug.cgi?id=6792#c9

anidel 2009-12-28 23:24

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Does it transmit while charging?

Mine in on charge now, FM Transmitter is off, level is 113.
I can't activate the FM Transmitter (as per the bug) while charging.

go1dfish 2009-12-28 23:27

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:

Originally Posted by anidel (Post 444538)
Does it transmit while charging?

Mine in on charge now, FM Transmitter is off, level is 113.
I can't activate the FM Transmitter (as per the bug) while charging.

I get the same behaviour, but apparently some people are able to have their FM transmitter on at reduced power while charging.

I wonder if it's a difference in charging through a 'dumb' charger vs. a USB Host.

anidel 2009-12-28 23:28

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Uhm.. indeed.

Anyway apparaently that has been fixed in 51-5, but I can't test it.

anidel 2009-12-28 23:31

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Ah I just plugged the wall charger in and it works.
If I plug in the USB cable (attached to a computer) than it complains... Interesting.

And yes, the power_level dropped from 118 to 93 on the pre-production and to 88 from 113 on the Summit one.

j.s 2009-12-28 23:55

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
Quote:

Originally Posted by jsharper (Post 444430)
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...

Bug https://bugs.maemo.org/show_bug.cgi?id=7425 entered. I am in region 2. /sys/class/i2c-adapter/i2c-2/2-0063/region_bottom_frequency is 87500

If you have a region_bottom_frequency less than 88100 and 88.1MHz is the lowest frequency available to you in the FM transmitter GUI and you want to set a freq below 88.1, please vote for bug 7425.

If you are able to set a frequency below 88.1 by the GUI (or other means), please post to this thread.

jsharper 2009-12-29 00:04

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
i thought i had seen a bug for that (88.1 being lowest selectable in GUI) but I can't find it now. I've voted for 7425.

anidel 2009-12-29 00:12

Re: N900 Radio Transmitter: ways to amplify the radio signal
 
According to the N900 manual the limit is 88.1 - 107.9.
According to Wikipedia an FM Transmitter "can broadcast on any FM frequency from 76.0 to 108.0 MHz (or 88.1 to 107.9 in the US)"

Weird as right now Nokia's selling only the Euro version of the device.


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