[USRP-users] Re: How to have 10MHz on REF OUT with a master clock of 184.32 MHz

[patrice . pajusco]

Dear all,

I plan to use 2 USPRs to analyze LTE signal. One will use a GPSDO to have a 
good clock and time reference. To have synchronization between them, the second 
one will be set on external synchronization (ref out -> ref in, for 10 MHz and 
PPS). A Master clock of 184 is recommended for LTE. According to previous 
answers of this post, this configuration is impossible. If the second USRP can 
be locked on 9.96 MHz, the received frequency will be wrong. In practice (We 
have just tried), the synchronization fails “Error: RuntimeError: Reference 
Clock PLL failed to lock to external source”. Any idea of a backup plan ?

Best regards

Patrice
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[USRP-users] Re: How to have 10MHz on REF OUT with a master clock of 184.32 MHz

[Brian Padalino]

On Fri, Aug 4, 2023 at 3:52 AM  wrote:

> Dear all,
>
> I plan to use 2 USPRs to analyze LTE signal. One will use a GPSDO to have
> a good clock and time reference. To have synchronization between them, the
> second one will be set on external synchronization (ref out -> ref in, for
> 10 MHz and PPS). A Master clock of 184 is recommended for LTE. According to
> previous answers of this post, this configuration is impossible. If the
> second USRP can be locked on 9.96 MHz, the received frequency will be
> wrong. In practice (We have just tried), the synchronization fails “Error:
> RuntimeError: Reference Clock PLL failed to lock to external source”. Any
> idea of a backup plan ?
>

If you're just doing analysis on a commodity computer, then just make sure
your subcarrier spacing is set to 15 kHz with an appropriate sized FFT.
FFTW can do arbitrary sized FFTs, so I'd set everything to 200 Msps and get
down to a reasonable level in the FPGA using the DDC.  Then on the host,
I'd resample to whatever an integer multiple of that sample rate was that
gave me a good FFT size.

For example, 200 Msps -> 50 Msps (FPGA DDC) -> 3/5 Resampling on host -> 30
Msps -> FFT @ 2000 -> 15 kHz subcarriers.

If you actually need 30.72 Msps or 61.44 Msps, then resample either in the
FPGA (RFNoC block) or on the host.

If you want to get into the PLL on the device, then you can see if you can
program the reference input of the LMK04816 to accept a clock that isn't 10
MHz and is something else.

Lots of options, but they all require some work on your part.

Brian
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[USRP-users] Re: How to have 10MHz on REF OUT with a master clock of 184.32 MHz

[patrice . pajusco]

Dear Brian,

Thank you for the different possible options.

Patrice
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[USRP-users] Questions about using B200 mini-i with Windows apps (Windows 11)

[Maxim Belotserkovsky]

Hi. I've successfully used my B200 mini-i under GNU radio in a ubuntu
container. I've recently found a need to use simple routines just to
send/receive canned data samples from Windows. There are some example
utility programs that got installed a while back when I first installed the
UHD drive, which are located under "C:\Program Files\UHD\lib\uhd\examples".
I've successfully used "rx_samples_to_file" from Windows CMD shell to
receive usable data transmitted from an external RF source. However, when I
try using any of the transmit routines, such as "tx_sampes_from_file" or
"tx_waveforms" (including just sending a canned SINE waveform), nothing
happens - all I get when I hook up the TX output to the scope is just
background noise. I know it's not the physical device, because it still
works with GR. For example, I've used this:
"tx_waveforms --wave-type SINE --wave-freq 1.0e3 --freq 70.0e6 --rate 1.0e6
--gain 20 --bw 200.0e3".
Thanks

-- 
Maxim Belotserkovsky
ma...@gotenna.com

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[USRP-users] Re: Questions about using B200 mini-i with Windows apps (Windows 11)

[Marcus D. Leech]

On 04/08/2023 10:47, Maxim Belotserkovsky wrote:
Hi. I've successfully used my B200 mini-i under GNU radio in a ubuntu 
container. I've recently found a need to use simple routines just to 
send/receive canned data samples from Windows. There are some example 
utility programs that got installed a while back when I first 
installed the UHD drive, which are located under "C:\Program 
Files\UHD\lib\uhd\examples". I've successfully used 
"rx_samples_to_file" from Windows CMD shell to receive usable data 
transmitted from an external RF source. However, when I try using any 
of the transmit routines, such as "tx_sampes_from_file" or 
"tx_waveforms" (including just sending a canned SINE waveform), 
nothing happens - all I get when I hook up the TX output to the scope 
is just background noise. I know it's not the physical device, because 
it still works with GR. For example, I've used this:
"tx_waveforms --wave-type SINE --wave-freq 1.0e3 --freq 70.0e6 --rate 
1.0e6 --gain 20 --bw 200.0e3".

Thanks

--
Maxim Belotserkovsky

ma...@gotenna.com




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Try turning the gain up 10-20dB.  The gain-control range on TX on the 
B200 series is 90dB.  So at 20dB, you're about 70dB

  below the maximum output level.

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[USRP-users] MPM major compat number mismatch even after updating FW to latest on X410

[Victor Levin via USRP-users]

Hi all,

I am using an X410 with X4_200 FPGA and latest FW as downloaded by 
uhd_images_downloader -t sdimg -t x4xx. This initially was working 
(uhd_usrp_probe and other calls went through fine) using UHD 4.4.0.0 on the 
host. 

In order to use DPDK, I pulled the UHD repo from version branch V4.4.0.0 and 
recompiled with the ENABLE_DPDK flag turned on. After doing this, I sanity 
tested the newly compiled and installed UHD without DPDK. 

Here is the output from uhd_usrp_probe:

[INFO] [UHD] linux; GNU C++ version 11.3.0; Boost_107400; DPDK_21.11; 
UHD_4.4.0.heads-v4.4.0.0-265-ga2a04e31
[WARNING] [PREFS] Loaded config from /root/.uhd. This location is considered 
deprecated, consider moving your config file to /root/.config instead.
[INFO] [MPMD] Initializing 1 device(s) in parallel with args: 
mgmt_addr=192.168.15.2,type=x4xx,product=x410,serial=3257310,name=ni-x4xx-3257310,fpga=X4_200,claimed=False,addr=192.168.15.2
[ERROR] [MPMD] MPM major compat number mismatch. Expected: 5.2 Actual: 4.4. 
Please update the version of MPM on your USRP device.
Error: RuntimeError: MPM major compat number mismatch. Expected: 5.2 Actual: 
4.4. Please update the version of MPM on your USRP device.

I don’t understand where 5.2 has come from. It looks like the host UHD is 
expecting 5.2. However the branch of UHD host that I compiled is definitely 
UHD_4.4 as show in the first line of the output. Running uhd_images_downloader 
again after recompiling still pulls the same sdimg file as before so updating 
the FW again doesn’t help. 

Anyone know what’s going on here? 

Thanks,
Victor___
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[USRP-users] Re: What is the power socket on an Octoclock CDA-2990?

[Marcus D. Leech]

On 04/08/2023 20:49, shapkiqua...@gmail.com wrote:


Below is shown an Octoclock CDA-2990. What is this threaded 6-to-15V 
power socket?


What would be a corresponding threaded connector used with that?

(two images are attached)



I *THINK* one of these will work:

https://www.digikey.ca/en/products/detail/tensility-international-corp/10-00113/2123068?utm_adgroup=&utm_source=google&utm_medium=cpc&utm_campaign=Pmax%20Shopping_Product_New%20Customer%20Acquisition&utm_term=&productid=2123068&gclid=CjwKCAjww7KmBhAyEiwA5-PUSpaO7wV6n5IvvRxsvnUHHwehR7mf9c3mk9ioWTUhujMxV1MXJSGCehoCwYYQAvD_BwE

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