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

From: Arjun Nadh
Subject: Re: [Discuss-gnuradio] [USRP-users] Spikes in b210 received data
Date: Tue, 24 Mar 2015 10:59:51 +0530

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?


Attachment: b210_ramp_new.png
Description: PNG image

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