Re: [Openbts-discuss] Frequency Notching

[Alexander C. <ale...@gm...>]

Kurtis,

I'm not an expert too, but from generic knowledge the best way is to
use analog RF filter. USRP may have unwanted emissions in the selected
range even if it's configured in software not to emit there because of
noise, spurs, etc. And actually right now OpenBTS emits only at a
frequency you've configured to transmit at.

On Thu, Nov 11, 2010 at 10:03, Kurtis Heimerl <khe...@cs...> wrote:
> 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!
>
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-- 
Regards,
Alexander Chemeris.
http://www.fairwaves.ru