Spectrum analysis shows strange carrier

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Bjoern Heller mailinglists at hellercom.de
Mon Jul 20 17:39:01 UTC 2009


Es gibt zwei Trägerfrequenzen, eine von der BS zur MS (Downlink) und  
eine für die andere Richtung (Uplink).

Gruß

Am 20.07.2009 um 18:39 schrieb dexter:

> Hi folks.
>
> We have a Toy-Spectrum-Analyser here, so i have measured the output  
> of our BS-11 when initalized with -f 123
>
> http://www.root.runningserver.com/pub/openbsc_spektralanalyse.png
>
> Why are there 2 carriers emitted by the BTS?
>
> I thought that openBSC uses only one TRX. I have verfied that the  
> carrier must be emitted by the BTS. If i stop the BTS the carrier  
> vanishes and the T-Mobile carrier comes through (much weaker, of  
> cause)
>
> I have no explaination for this effect, can anyone give me a hint?
>
> regards
> Philipp
>

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Björn Heller
Jabber: tec at jabber.hellercom.de

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