Re: [Discuss-gnuradio] USRP2 - BasicTX first Nyquist zone frequencies

[Ronaldo Nunez]

Hi Eric,

i felt like you when I read it, but take a look here
(http://gnuradio.org/trac/wiki/USRP2GenFAQ) :

"With Basic TX board, USRP1 can generate maximum of 44 MHz frequency,
What USRP2 is capable of ?

44 MHz is the highest frequency in the first Nyquist zone on the USRP1.
Much higher frequencies can be used in the higher zones. The USRP2
takes 100 MS/s rates and interpolates up to 400 MS/s. Direct
frequencies up to ~170 MHz should be usable. "

Maybe I interpreted wrong... Be free to correct me...

Regards,

Ronaldo

2009/3/16 Eric Blossom <address@hidden>:
> On Mon, Mar 16, 2009 at 10:05:28AM -0300, Ronaldo Nunez wrote:
>> Hello,
>>
>> I read in faq that the bigger frequency of the first Nyquist zone of
>> USRP2 is about 170 MHz, using a BasicTX daughter board.
>> My USRP2 couldn't get more than 50 MHz with this daughter board.
>>
>> I'm using 9939 firmware revision.
>>
>> Somebody observed the same problem with usrp2?
>> There is a way to fix it?
>>
>> Thanks
>
> I'm not sure where you found the 170 MHz number, or where it may have
> come from, but the USRP2 DACS run at 100 MS/s.  With the Basic Tx
> 50 MHz is what you would expect to see as the edge of the first
> Nyquist zone.
>
> Eric
>



-- 
__________________________________
Ronaldo A. Viera Nunez
Acadêmico/Engenharia Elétrica
Universidade Federal de Santa Maria

Santa Maria - RS - Brasil