Re: [Discuss-gnuradio] FSK with RFX2400

[Matt Ettus]

Jonathan Friedman wrote:
> > Secondally how can I remove the ISM bandpass filter which is by default
> > there with RFX2400.
> >     
>
> You have to de-solder it. Optionally (in case you don't want to remove
> the part, since it will be difficult to reinstall it), you could
> install a jumper (zero-ohm resistor) or (better) a small 10pF
> capacitor in parallel (there is a pad), but this may cause some weird
> side-effects if you use the USRP in the ISM band after installation.
>
>   

You need to put a cap of between 25 and 500 pF in that location, AND you 
need to cut the traces which go to the filter.  If you don't you will 
get weird resonances.

Matt