[Openbts-discuss] Frequency Notching

[Kurtis H. <khe...@cs...>]

Hello OpenBTS Discuss!

We're currently setting up our first field deployment using the GSM900
spectrum, but the regulatory agency giving us permission has asked
that we Notch out the 941-944 MHz frequencies for tx. I don't see any
obvious way to block out these frequencies in the config, so I have to
assume we'll need to modify source in some way. Any ideas on an easy
way to hurdle this limitation? I feel like there are a lot of possible
solutions (filtering on the USRP, wire filtering, so on) and I have
little intuition on the best way to go.

Thanks!