Re: [Discuss-gnuradio] UHD: USRP Source

[Richard Bell]

The Nyquist theorem says in general your sample rate equals your two sided 
bandwidth, i.e. Fs=10 MHz -> BW = 10 MHz. In general, your samples are complex. 
As soon as you restrict samples to be real in time, you cut the useable 
bandwidth in half. This is because real time samples imply conjugate symmetry 
in frequency. If you have independent I and Q values, you have complex data. 
The USRP feeds you complex data. 

Don't memorize the Nyquist theorem as the sample rate is twice the bandwidth. 
That's incorrect in general. 

Sent from my iPhone

> On Sep 16, 2015, at 9:33 AM, Martin Braun <address@hidden> wrote:
> 
> Gerome,
> 
> if you set a sampling rate of 4 MHz, you will have 4 MHz of usable
> bandwidth (complex baseband). This is how it's supposed to be.
> 
> M
> 
>> On 16.09.2015 09:27, Gerome Jan L wrote:
>> Hi guys,
>> 
>> Actually, that's what I thought too. If I set the UHD: USRP Source
>> samp_rate to 400 Msps, I should expect a maximum bandwidth of 200 kHz.
>> However on my testing, assigning that value in the samp_rate, gives me
>> its bandwidth. For example, I set it to 4 Msps, and I get a 4 MHz of
>> bandwidth. I think I am missing something here. I will be attaching one
>> of my screenshots below.
>> 
>> This is set to a samp_rate of 5 Msps. and I get a bandwidth of 5 MHz.
>> That is from 88 MHz to 93 MHz. Our FM here is separated by 800kHz. Thank
>> you in advance.
>> 
>> 
>> ​
>> 
>> Best,
>> 
>> *Gerome Jan M. Llames *
>> Aspiring Technopreneur | Tech Savvy | Curious
>> Mobile: +639271525124 <tel:%2B639271525124>
>> Email: address@hidden <mailto:address@hidden>
>> 
>> "/Because the people who are crazy enough to think they can change the
>> world, are the ones who do./"  - Steve Jobs
> 
> 
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