Re: [Discuss-gnuradio] [USRP-users] Spikes in b210 received data

[Arjun Nadh]

Hi Tom,

I have tried reducing the signal level. The signal level at the input is now -40dBm. Still there is this ramp behaviour.

I also get this  when I use the B210 in loopback mode (with a 30dB atttenuator in the loop). Also I have observed that

the lower the master clock rate that I set, the less frequent the ramps.

Thank you,

Arjun Nadh

On Tue, Mar 24, 2015 at 5:56 AM, Tom Tsou <address@hidden> wrote:

Hi Arjun,

On Fri, Mar 20, 2015 at 11:15 PM, Arjun Nadh via USRP-users
<address@hidden> wrote:
> On observing the received samples, there is a periodic " ramp " on the
> received sample. Attaching the plot. I do not observe this effect while
> using N210. Also I do not observe this if I use the internal clock.

Can you reduce the level on the VSG by a few dB and see if that
changes the behavior?

And is the ramp effect consistently tied to the use of the external
reference? or is the relationship intermittent?

  -TT

b210_ramp_new.png
Description: PNG image