Re: [Openbts-discuss] Frequency Notching

[<dbu...@jc...>]

Kurtis -

There is no way to do this from the config. It may be possible to add some code to the TRXManager to prevent tuning to these frequencies for tx, but that still doesn't fix your problem, since the RFX output is pretty noisy. The safest thing to do is put a cavity filter of some kind between the PA and the duplexer. That will be expensive and have a long lead time, but it's probably what the regulator had in mind. You may also be able to put some kind of filter between the RFX output and the PA, but that will not be safe if you start to compress the PA.

Do you know what application uses these frequencies in your area?

Is there an RF specialist you can consult in your EE dept?

-- David

Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Kurtis Heimerl <khe...@cs...>
Date: Wed, 10 Nov 2010 23:03:17 
To: <ope...@li...>
Subject: [Openbts-discuss] Frequency Notching

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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