2012/8/8 Sylvain Munaut <246tnt(a)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.