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

[Roshan Baliga]

?? 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