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Andrey Sviyazov andreysviyaz at gmail.com2012/8/8 Sylvain Munaut <246tnt at gmail.com> Which spec is that exactly ? > Its about far-near problem (05.05 p.5.1), i.e. blocking by near mobile with high signal at only 600kHz offset. Therefore, calculated that LO noise at 600kHz offset should be around -140dBc/Hz to keep nominal Rx sencitivity for wanted far mobile. > > Regarding the GSM 1800 version of the selectivity board, it will not be a > > problem to change the mixer and the filters. However, are you sure we > will > > be able to get the correct matching if we only change the passives ? Are > you > > sure we would not need to modify the PCB traces to get a good matching > for a > > 1800 MHz version of the board ? What do you think ? > > Unless I missed something fundamental, this board is only RX side right ? > Yes, it contain LNA, DivSwitch, down converter and IF filter for Rx path only. Late I'll make band dependant boards with 1-2W TxPA and ceramic duplexer. But, possible no reasons to do it, I don't sure yet. To get any significant loss in RX due to mismatch, you need a very > large mismatch. > Yes. Best regards, Andrey Sviyazov. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120808/92f3d134/attachment.htm>