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Re: [Discuss-gnuradio] FSK with RFX2400

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] FSK with RFX2400
Date: Tue, 22 Jul 2008 13:00:58 -0700
User-agent: Thunderbird (X11/20080501)

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.


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