http://www.google.com/search?q=inurl%3Adiscuss-gnuradio+disable+ism+filter
"The filter affects both TX and RX, but not the auxiliary RX path
(RX2). If you just want to receive, use the 2nd SMA port and make sure
to set that in the software. If you want to bypass the filter for
transmit, you will need to put a cap of about 50 to 200 pF in the
path, and cut the traces to the filter."
">> 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.
"
Jason
On Tue, Aug 17, 2010 at 9:24 AM, Zhen wrote:
> Hello,
>
> My current application needs to work on ISM band, and there is an ISM band
> filter on RFX900, how to remove or bypass the ISM band filter on the RFX900?
>
> Thanks
>
> Zhen
>
>
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