|
From: <dbu...@jc...> - 2010-11-11 07:27:09
|
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! ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Openbts-discuss mailing list Ope...@li... https://lists.sourceforge.net/lists/listinfo/openbts-discuss |