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Re: [Discuss-gnuradio] Setting the XCVR2450 Bandwidth

From: Michael Hill
Subject: Re: [Discuss-gnuradio] Setting the XCVR2450 Bandwidth
Date: Wed, 22 Aug 2012 22:41:00 +0930

Thanks Josh,

I've still been toying with this though.. and aren't really having any success.
E.g. if I pick a Tx bandwidth of 24MHz.. and transmit

and use 8bit I&Q samples transmitted at 50MHz.. then shouldn't I see some signs of the filter?
What should I be looking for on my spec amp?

I assume by baseband filter, that you mean this is a digital filter that applies what I send from the CPU to the USRP..



On Wed, Jul 11, 2012 at 9:09 AM, Josh Blum <address@hidden> wrote:

On 07/08/2012 04:28 AM, Michael Hill wrote:
> Hi,
> This is a two part question
> 1) What are the XCVR2450 bandwidth options?
> I've looked at the website and discussion list threads on the matter and
> seen different answers on what the the bandwidth options are for the
> XCVR2450 daughterboard.
> The spec sheets seem to indicate different answers too.. which muddle me
> further as I'm unsure if i'm reading them wrong.
> Can someone clarify for me what they are? Have there been two revisions of
> this hardware of something?

Maybe there is some confusion about specifying the bandwidth of a
baseband filter. See this for available rates.
20 MHz means +/- 10 MHz about the center of the baseband signal.

> 2) How do I se the bandwidth?
> I'm trying to use the Bandwidth block on the UHD_Sink.
> However I don't get any confirmation messages or indicators if i've set it
> wrong.. how can I check?

RX defaults to 19MHz and TX 24MHz. You really cant see the filter
profile unless sample rate > filter BW


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