Re: [Discuss-gnuradio] USRP Daughtercards LFTX and LFRX

[Matt Ettus]

samzuni wrote:
> Hello all,
> I am about to attempt to dabble in the GNURadio/USRP World, and am primarily
> interested in the HF ham bands. More specifically for PSK operations. To
> further that effort, I am curious if, as with the BasicRX and BasicTX
> daughtercards, I would still have to construct some sort of external
> filtering, RF frontend, and pre-amplification circuits with the LFTX and
> LFRX boards. Or, can they be used directly, with all selectivity, filtering,
> and frequency selection done with GNURadio S/W?
> Thanks folks. Lots of interesting things going on here.
> Sam.
>   

You can use them directly, but you will not have the dynamic range or 
noise figure you would want for a high performance radio.  An ideal 
radio would add gain, AGC, and filtering. 

Matt