[Openbts-discuss] mini eWave MB and TRX 900/1800 DB for Gnuradio

[Jongjay L. <jon...@ho...>]

Hello community,

Comments and responses regarding my earlier announcement.

For further inquery, please send email to jon...@ho...

(from Alexander Chemeris)
> Is the hardware open source?
  Yes, it is open source and API compatible with gnuradio, I tested my hardware running gnuradio-3.3.0, OpenBTS 2.6, and Fedora11.

> Also, the naming of your products are misleading in my opinion..
  Apologize about this confusion. 
  For now, I call it mini eWave mother board and TRX 900/1800 daughter board. USRP1, USRP2 are Ettus Research trademark.

>Do you actually mean that maximum output power is -4dBm, which is 0.4mW?
  I measured from TX/RX output port with Agilent E4406A, which is around -4 dBm, for desktop testing, I plan to add 0.5Watt 6V mini PA with built-in duplexer and LNA , and it should pump output to 27dBm with user adjustable attenuation from OpenBTS configuration.

>What exactly does your "0.05 ppm" mean in the OCXO specs? Is it
>initial calibration accuracy, or temperature stability, or overall
>stability for 1year, or something else? 
  list OCXO specs for your information
  - Temp stability <= 1x10*(-8) @ -20C~+70C (Celcius)
  - day aging <= 1x10*(-9)
  - year aging <=1x10*(-8)
  - accuracy  <=1x10*(-8) measured @ 25C 
    after 30 days it should stabilized to <= 5x10*(-8)
  - phase noise <= -135dBc/Hz @ 1khz
  - square pulse
  - wave output up/down <= 5ns
  - supply voltage +5Volt
  - in rush current draw <= 700mA
  - working current draw <= 300mA


(from Belial & Axelle)
> Also, what's "mini" about it? the size?
  mini eWave mother board is 118x97mm (4.65x3.82 inches)
  mini TRX 900/1800 daughter board is 56x98mm (2.2x3.86 inches)

>The price I hope! :-)
  Limited Sample PRICE: 
  - mini motherboard USD$608 or Euro358/pcs
  - mini TRX900/1800 USD$195 or Euro128/pcs
  - 52Mhz 0.05ppm OCXO USD$274 or Euro200/pcs
  plus shipping and handling

PCB is made with multi-layer FR4, green resist, nickel-gold finishes. connection between mother board and daughter 40-pins milli-grid. MB and DB chip side are on opposite side not one stack on top of the other with Molex connector, design for better heat transfer. All board tested before shipping. Our main motivation is to offer this community alternative hardware solution.