Based on the USRP1 rev 4.5 and RFX 900 / 1800, the URAN-1 (Rev 1.0) is a custom designed OpenBTS GSM Base Station board with the following specifics: TCXO 0.1ppm 52.000MHz Ultra precision Golden Oscillator; Software define the frequency range 1 (750 – 1050 Mhz) and range 2 (1500 – 2100 Mhz); The following on-line documents can be found: (rfpga dot com) Board Schematics x 1 (or google `iplinkme` or `rfpga` for it) Board dimensions drawing x 1 (or google `iplinkme` or `rfpga` for it)The kit includes: URAN-1 board with frequency range 1 (750 – 1050 Mhz, or 1500 – 2100 Mhz) x 2 USB 2 cable x 2If you need OpenBTS demo ISO file and manual: OpenBTS demo ISO file (or google `iplinkme` or `rfpga` for it) Note: Autostarted OpenBTS 4.0 inside, So, read OpenBTS 4.0 manual carefully Stop OpenBTS 4.0 first … if you need to If need the software defined radio (SDR) GSM Base Station ready, please refer to: HP URAN-1 USRP OpenBTS Software Defined SDR GSM Base Station System 1U Rack URAN-1 USRP Based OpenBTS / SDR GSM Base Station Development kit