Spectrum analysis shows strange carrier
zero-kelvin at gmx.de
Tue Jul 21 11:53:03 CEST 2009
> In the meantime I did check with my spectrum analyzer. There is
> indeed a signal coming from the BS-11, even if nothing else is
> connected to the BS-11 (no serial connection, no E1). The signal
> starts to be emitted after the firmware download is complete.
> I could measure the signal at 942.4 MHz, the level is about -42 dBm
> (cable connection from the spectrum analyzer to TRX0, low-quality
> cable). The signal strength does not depend on the power amplifier
> setting, I wonder where it comes from (some internal oscillator
> working at that frequency ?). The signal is not very strong, so
> it should not cause major trouble (besides disturbing a weak
> signal which might be there from an "official" source if you
> are close to the BS-11).
I think i can confirm that. This was measured during the BS11 startup:
For me the case is closed, think this behaviour is just normal.
More information about the OpenBSC