[USRP-users] N310 TX gain: jump of +2dB

[Serge Malo via USRP-users]

Hi all,

We are measuring the output power of the N310 when streaming a CW signal
(with the example tx_waveforms), with different values of "gain". The exact
command we use is:

./tx_waveforms --args=addr=192.168.20.2,master_clock_rate=153.6e6
--rate=2560 --freq=157542 --ref=external --pps=external
--channels=0 --ampl=0.296 --gain=XXX

We are under Ubuntu 18.04, and using UHD 3.13.1.0

The output power is pretty linear for gain values between 0 and 52, which
is expected.
However, there is a +3dB jump between gain values of 34 and 35, instead
of +1dB.
(So, between 0 and 52, there is actually 54dB difference instead of 52)

Q: Is this "expected", or can this be explained?
Q: Will this "jump" be present for all revision of N310 devices, or UHD
versions?

Thanks!
Serge
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Re: [USRP-users] [UHD] Update to USRP E310 filesystem (v3.15.0.0 pre-release)

[Philip Balister via USRP-users]

On 05/24/2019 07:55 PM, Sugandha Gupta via USRP-users wrote:
> Hi all
> 
> We finally have a new filesystem for E310. This is an early release so
> people can try it out before the final UHD-3.15.0.0 release.
> The filesystem is now very similar to N3XX and E320 filesystem and will be
> updated with every UHD release in future.

Is there a table the maps code names (like neon and sulfur) to the
products they support?

Philip

> 
> Here is a summary of the changes:
> -  The new filesystem ( 
> v3.15.0.0-e310_prerelease
> 
> )  uses Linux kernel 4.15.
> Customers can build custom filesystems as well. More details on that are in
> the README
> . We
> plan to move to Linux 4.18 for the final 3.15.0.0 release. Timeline for
> that is still TBD.
> - UHD version: v3.15.0.0-e310_prerelease
> 
> - E310 FPGA
> 
> architecture now supports MPM .
> If you have been using RFNoC, you should able to use your existing blocks
> with no changes. The only change is the name of the image bit files
> generated.
> - These filesystems do not include GNURadio. Adding GNURadio maint 3.7
> means adding python2 support on top of python3 which blows up the size of
> the filesystem. In order to keep rootfs size small and have faster remote
> mender 
> updates, we decided to leave it out the default image. In order to use
> GNURadio, custom images need to be created. We will add instructions for
> adding GNURadio to the manual/knowledge base soon.
> 
> Note that the SD card shipped with E310s does not contain the latest
> filesystem images. In order to use the new filesystems, the SD cards need
> to be manually flashed. You can download the filesystem and new SDK here
> .
> Follow the instructions in E310 manual page
>  to burn a new SD card
> and get started. The manual page also contains a Migration Guide to help
> setup the device and suggests possible changes to customer applications.
> Please let us know if you have any questions. You can report bugs here
> https://github.com/EttusResearch/uhd/issues.
> 
> - Sugandha
> 
> 
> 
> 
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> 

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[USRP-users] N210s for sell

[Jeff Scaparra via USRP-users]

I have two N210s for sell and a number of daughter boards. Seeing if there
is any interest here before I put them up on ebay. Feel free to send me a
direct email if interested and I will be happy to send you any information
including pictures. Both were used as hobby radios for tinkering and really
haven't been used much at all which is why I  am looking to get rid of
them. I wanted to play around with beam forming but really never found the
time.

Prefer to ship to US but willing to entertain outside offers as well.

Jeff N5SDR
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