RE: [Discuss-gnuradio] USRP2 LFTX maximum real baseband bandwidth?

[Ulrika Uppman]

Hi,
I believe the short format isn't implemented for the USRP2 yet, or has this 
been done recently?

/Ulrika

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden
>  On Behalf Of TANGUY Philippe
> Sent: Thursday, February 25, 2010 10:01 AM
> To: address@hidden
> Subject: [Discuss-gnuradio] USRP2 LFTX maximum real baseband 
> bandwidth?
> 
> Hi all,
> 
> I would like to send a real signal with a bandwith from DC to 
> 25MHZ thanks to the USRP2 and the LFTX daughterboard.
> 
> So, I generate a Real baseband signal and I use only the "I" channel. 
> But, it seems that the minimun interpolation of USRP2 is 4 
> (USRP2faq) that's why I use interp=4. So, I have a bandwidth 
> of 12.5 MHz because the sampling frequency is fs=25 MS/s ==> 
> fs/2 = 12.5 MS/s. For me, it seems good.
> 
> So, my first question is:
> Is it possible to use an interpolation of only 2 to have 
> bandwidth=25 Mhz?
> 
> Secondly, I'm not sure but if we use interp=2 we have before 
> the DUC a data rate = 50 MS/s * 32 (float32) = 1600 Mbits/s 
> ==> > Gb/s.
> However, if we use interp=2 and "short" format, we have a 
> data rate = 50 MS/s * 16 (short) = 800 Mbits/s ==> < Gb/s.
> 
> Is it correct?
> 
> Thanks,
> 
> Philippe.
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>