Forum: GNU Radio For basic daughter board, can you give me some tips?

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406377f8afc94b1135c521902231ff7f?d=identicon&s=25 龙飞 (Guest)
on 2007-05-22 15:08
(Received via mailing list)
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?
2. In the document "RfSections4USRP", it recommended that we should
design
filter ourself, then how can we design the filter?

Thank you very much.
D8567cd44ef4d0816c00b81ccf7656ff?d=identicon&s=25 Roshan Baliga (Guest)
on 2007-05-22 17:55
(Received via mailing list)
?? 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.

-Roshan
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