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Re: [Discuss-gnuradio] LFRX as IF stage questions

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] LFRX as IF stage questions
Date: Wed, 14 Aug 2013 07:47:05 +0800

I just realized the LFRX does not have the clock pin.  The BasicRX does, and should also work the same way for your application.  So if you need the clock output, the BasicRX is a better choice.


On Wed, Aug 14, 2013 at 7:25 AM, Matt Ettus <address@hidden> wrote:

The LFRX has 2 inputs.  For your application you only need to use one of them, since you have a real IF and not complex IQ baseband.  The signal will then be downconverted from 10 MHz by the DDCs, and you will have a complex baseband signal.

The LFRX has a clock output pin.  You will need to explicitly turn that pin on and set the divider to 10 in order to get a 10 MHz reference output for your system.


On Fri, Aug 9, 2013 at 5:25 PM, Nemanja Savic <address@hidden> wrote:
Hi all guys,

I have designed a small board based on Ti's CC1000 transciever, which I want to use as my RF front end. The board provides 10.7 MHz IF signal at one of the pins. After connecting everything I come to the point where I don't understand what's going on after LFTX.
In the "documentation" about LFTX on ettus website it is written that it can be used for one complex baseband rx channel or two real valued rx chains. I which way i can get only real valued signal from RX-A (taking only the real part from the signal coming from usrp source?)
I suppose that signal is downconverted to baseband using DDCs. Do they make quadrature signal from the input and make complex baseband at the end?

Is there any stable clk signal at the board with frequency between 10 MHz and 14 MHz that I can use as clock reference for my board?


Nemanja Savić

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