Why GSM900 is called GSM900 with the number 900?

[jason_class]

Hello All

Anyone knows why GSM900 is called GSM900 with the number 900?
Is it because of the RF signal propogates at 900MHz
OR
the local oscillator used is oscillating at 900MHz?

Kindly enlighthen
Thank you


rgds and thanks
Jason

 

[chihhao]

Re: GSM900

RF spectrum occupied 880MHZ~960MHz.
In general,people call it GSM 900, 900 means 900MHz.
You can say the signal propagates at 900MHz.

 

[jason_class]

Re: GSM900

Thanks for that info.
But what is the Local oscillator frequency used motly for GSM900?

Thank you


Jason

 

[truebs]

Re: GSM900

900 singifies the center frequency, not related to local oscillator frequency.
Acutal details about of GSM system architecture can be found in
" Cellular and Mobile Communication " By C.Y. Lee


However the local oscillator also resonates at 900 Mhz only. But as far as nomenclature is concenrned the origin is unknown.

However some of the standard books suggests its due to the reason that frequencies used are around 900 Mhz.

 

[eecly]

Re: GSM900

because it's RF is 900 MHz