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Re: [Discuss-gnuradio] XCVR2450 Phase Lock Loop, AGC and capture effect

From: mleech
Subject: Re: [Discuss-gnuradio] XCVR2450 Phase Lock Loop, AGC and capture effect
Date: Tue, 21 Feb 2012 13:41:49 -0500
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Last time I looked at the XCVR2450 schematic, there was no AGC.  Any AGC would be implemented in software in the end application, and the PLLs on the XCVR2450 are used to set the center frequency of the quadrature downconverter.  The hardware doesn't "know" anything about whatever modulations you're using.  The USRP family shovel basebanded-and-filtered RF bandwidth back and forth to your host computer. What you do with those samples is up to you.

Things to consider:

    o ADC Dynamic range--there's at least 70dB of dynamic range available, so you should be able to distinguish the two signals, unless they're right on top of each other.

    o Analog Dynamic range--if one of the signals is starting to drive the analog front-end into compression, it doesn't matter how much dynamic range you have on the digital side


On Tue, 21 Feb 2012 19:13:42 +0100, address@hidden wrote:

Hi everyone,

First of all thanks a lot for any support!

I am using the XCVR2450 Daughterboard together with the USRP1. My  
setup consists of two transmitting nodes and one receiving node, in  
which both transmitters send messages in overlapping time slots.

I was wondering how I can access any settings related to the capture  
effect when receiving two signals. In my opinion either related to the  
Phase Lock Loop or Automatic Gain Control.

Any hints, suggestions or detailed help will be highly appreciated!

best regards and thanks a lot,


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