Hi Jonathon,
That's an interesting idea. It hadn't occurred to me because I need to be
able to sample both channels which limits the aggregate sample rate to 32 MSps
as I understand. But its worth a try in the single channel mode for diagnostic
purposes.
Cheers,
Chris
Get Outlook for An
Just a data point. Here's a 256QAM constellation from an Ettus B210. I
don't know what the exact EVM percentage is, but the constellation looks
pretty good. This is at 429 MHz, 10.721074 Msps and 42.884296 MHz master
clock rate with a commercial digital television demodulator evaluation
board.
The B210 is telling you it's sample rate is off frequency.
Setting RX Rate: 27648000.000 Sps...
[INFO] [B200] Asking for clock rate 27.648000 MHz...
[INFO] [B200] Actually got clock rate 27.648000 MHz.
Actual RX Rate: 27648000.081 Sps... <-
Is your receiver
Hi Chris,
Have you tried offset tuning? For example, setting the master clock rate to
55.296e6, the sample rate to 27.648e6, and offset tuning by 14 MHz?
Jonathon
On Fri, Mar 26, 2021, 17:09 Beaudoin, Christopher J <
christopher_beaud...@uml.edu> wrote:
> So both should be synchronized (unless
So both should be synchronized (unless I'm missing something) because I'm
externally referencing the B210 to the signal generator's 10 MHz reference. The
EVM over a couple 1000 symbols is good but when one looks at the EVM over ~13e6
samples, it deteriorates dramatically. Looking at the rx wavef
I would suggest going back to basics. What does the RX spectrum look like
compared to the TX spectrum? Are you doing clock recovery on the RX side, or
assuming both sides are synchronized?
Sent from my iPhone
> On Mar 26, 2021, at 4:38 PM, Beaudoin, Christopher J
> wrote:
>
>
> Hello Mar
Hello Marcus,
Sorry for the terse nature of my previous message. To be
more specific, the precise symbol rate is 4.608 MHz so the actual sample rate
is 27.648 MHz; the USRP sets the master clock rate to 27.648 MHz when I command
the sample rate. I'm not seeing any overruns a
At 30MSPS are you seeing any overruns? What is your master clock rate?
Sent from my iPhone
> On Mar 26, 2021, at 2:41 PM, Julian Arnold wrote:
>
> Chris,
>
> I would say that your EVM is mainly affected by your SNR and your digital
> receiver implementation (AGC / filters / clock recovery /
Chris,
I would say that your EVM is mainly affected by your SNR and your digital
receiver implementation (AGC / filters / clock recovery / equalizer / ...).
So without more details it’s going to be hard to say if what you are seeing is
within limits.
Cheers,
Julian Arnold, M.Sc
> Am 26.03.2
I'm capturing a 3 GHz QPSK signal with 5 MHz symbol rate by sampling the signal
at 6 times the symbol rate. The B210 is externally referenced to a very clean
10 MHz reference. My measurements of the EVM sampling the signal for \~0.5
seconds are pretty poor \~30-40%. I can provide more setup deta
Thanks for sharing. I did have a full duplex single channel working. This
started from a question of "can you run the exact same for a second channel
so we can compare performance of different antennas". The simple approach
I wanted for that was to just run two copies of the flowgraph. Based on
Hi Christopher,
On 26/03/21 16:29, christopher_beaud...@uml.edu wrote:
> Is anyone else encountering errors from the website when searching through
> the archives?
If you mean mailing list archives, see this:
https://lists.ettus.com/empathy/thread/MMLLWUGPGIX2XZDAJB7HRS5I6SO6UES3
Regards
--
C
Is anyone else encountering errors from the website when searching through the
archives?
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