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Alexander Chemeris alexander.chemeris at gmail.comHi Jean-Samuel and Andrey, On Sun, Mar 18, 2012 at 18:25, Jean-Samuel Najnudel - BJT PARTNERS SARL <jsn at bjtpartners.com> wrote: > However, I really believe the preselector should remain on the UmTRX main > PCB. > If we want to connect the preselector as an external mezzanine board, it > would cost us 5 extra SMA connectors (RX1in, RX1out, RX2in, RX2out, clock > source), 2 RF switches before the superhet filtering (to still be able to > have switched diversity), several GPIO (serial mixer control, RF switches > control) and power supply. > This is possible but it would really cost much more than keeping the > preselector on the main PCB, especially as I believe, in practice, we will > need almsot always this preselector, even not to pass the GSM spec but just > to be able to get a reasonably narrow sampling bandwidth. > I would really suggest to keep the preselector in the main PCB and > populating or not the components (VCO/PLL, mixer and SAW IF). Could we save on connectors if we use some RF side connector with many pins? Nothing specific in mind, just thinking out loud. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru