Re: [Discuss-gnuradio] Connecting two USRP B200 radios

[Marcus D. Leech]

On 11/06/2015 10:46 AM, Ashish Pasha Sheikh wrote:
> Hello everyone,
>
> i am new to the world of SDR. I currently have two USRP B200 radios. I 
> would like to connect the Tx port of one SDR to Rx port of second SDR 
> using a cable to visualize the transmitted bits.
>
> I am generating random bits with Ts=1/10000 and 50 samples per frame. 
> Using a rectangular pulse shaping with 20 pulse length ....it would 
> output me a samples with data rate of 200KHz. I am transmitting the 
> baseband signal with gain of 8 and interpoaltion factor 512 over a 
> 432e6 frequency.
>
>
> now i want to visualize the signal by receiving it on another B200 
> radio . I receive complete noise irrespective of whether i am 
> transmitting (or) not. So can i connect the two B200 radios using a 
> cable so as to see the clean recevieed spectrum..
>
> In this case I believe i should use a attenuator in between the 
> cables.Can you please point more on this ? can i drectly connect 
> without an attenuator??
>
>
> Ash
> undergrad student,
Always use an attenuator, of at least 30dB.