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Re: [Discuss-gnuradio] For basic daughter board, can you give me some ti

From: Roshan Baliga
Subject: Re: [Discuss-gnuradio] For basic daughter board, can you give me some tips?
Date: Tue, 22 May 2007 08:55:19 -0700
User-agent: Thunderbird (X11/20060719)

?? wrote:
I'm a newer for the usrp. I want to make the hardware myself. And I have some questions:
1. what is the usage of the connectors except for the 64-pin connector?

Which connectors are you referring to? The 64-pin connector on each daughterboard carries all the signals and power from the USRP to the daughterboard. The rest of the .1 inch headers on the top of each daughterboard (for example, on the LFRX, J25, J15, J24, J16, and J17) are just there to bring out other signals for debugging or controlling other boards.

2. In the document "RfSections4USRP", it recommended that we should design filter ourself, then how can we design the filter?

The design of the external filter depends on what you're trying to accomplish. The USRP performs digital filtering (for example, there's a CIC in the FPGA), but external analog filtering can be helpful. For example, you may want a SAW filter or a bandpass filter to eliminate adjacent channel interference.


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