The u-blox SAW filtering is great. We've carried out various RF
measurements with +40 dBm EIRP at 2.53 and 3.75 GHz with some u-blox
ANN-MB within <2m of the Tx antennas. While we haven't conducted
in-depth comparisons with a superior ground-truth, my current conclusion
is that the u-blox RTK p
On 31.05.22 01:10, glen english LIST via time-nuts wrote:
Be aware not to confuse the antenna ground plane (the patch will
always have its own plane because the top metalization must be fed
against a plane or counterpoise - and a ground plane behind the antenna.
I can see the usefulness of t
Hi Erik,
have you tried running all receivers off the same antenna via a power
splitter (make sure to dc block all but one receiver)? That should
remove the uncertainty due to antenna differences (location, RF
characteristics, etc.).
Also, are you using ground planes for your puck antennas?
rg/fftw3_doc/One_002dDimensional-DFTs-of-Real-Data.html
--
M.Sc. Carsten Andrich
Technische Universität Ilmenau
Fachgebiet Elektronische Messtechnik und Signalverarbeitung (EMS)
Helmholtzplatz 2
98693 Ilmenau
T +49 3677 69-4269
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= { (N/2)^0.5 * \sigma * (N(0, 1) + 1j * N(0, 1)), k = 1 ... N/2 - 1
{ conj(X[N-k]) , k = N/2 + 1 ... N - 1
Best regards,
Carsten
--
M.Sc. Carsten Andrich
Technische Universität Ilmenau
Fachgebiet Elektronische Messtechnik und Signalverarbeitung (EMS)
Helmho
On 14.05.22 16:58, Matthias Welwarsky wrote:
I went "window shopping" on Google and found something that would probably fit
my needs here:
https://ccrma.stanford.edu/~jos/sasp/Example_Synthesis_1_F_Noise.html
Matlab code:
Nx = 2^16; % number of samples to synthesize
B = [0.049922035 -0.095993
On 11.05.22 08:15, Carsten Andrich wrote:
Also, any reason to do this via forward and inverse FFT? AFAIK the
Fourier transform of white noise is white noise, [...]
I had the same question when I first saw this. Unfortunately I don't have a good
answer, besides that forward + inverse en
On 10.05.22 10:37, Neville Michie wrote:
The use of forward then reverse Fourier transforms is one of the most important
achievements of the Fourier transform. When one data set is convolved with
another data set, it appears impossible to undo the tangle.
But if the data is transformed into the F
First, thanks to everyone who chimed in on this highly interesting topic.
On 04.05.22 18:49, Attila Kinali wrote:
FFT based systems take a white, normal distributed noise source,
Fourier transform it, filter it in frequency domain and transform
it back. Runtime is dominated by the FFT and thus O
ions there.
--
M.Sc. Carsten Andrich
Technische Universität Ilmenau
Fachgebiet Elektronische Messtechnik und Signalverarbeitung (EMS)
Helmholtzplatz 2
98693 Ilmenau
T +49 3677 69-4269
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M.Sc. Carsten Andrich
Technische Universität Ilmenau
Fachgebiet Elektron
Hi Markus,
On 20.04.22 08:24, Markus Kleinhenz via time-nuts wrote:
Am 19.04.2022 um 18:51 schrieb Carsten Andrich:
Thanks for the suggestion. I've had a quick look at the RCM.
Unfortunately, its "1PPS synchronization counter resolution" is
±2.5ns, which is below what a ZED-
Hi Markus, Jim,
thank you for your responses!
On 19.04.22 11:53, Markus Kleinhenz via time-nuts wrote:
I believe you will have a hard time finding a COTS solution that fits
most of your requirements.
You will likely have to split your signal chain into multiple devices:
1. UBlox ZED-F9T based
Fellow timing enthusiasts,
for RF up-down-converters up to 40 GHz I require highly stable,
synchronized reference signals for multiple, spatially distributed RF
synthesizers like the TI LMX2595.
Do any of you know COTS GNSSDOs that meet (at least some of) the
following requirements?:
* 10
Hello Matthias,
provided your OCXO is sufficiently stable, i.e., better stability than
the 1PPS, I agree that you should see said "bulge". Judging from the DAC
plot, the EFC voltage is being adjusted within the tau range in which
you expect the NEO-M8T bulge (10~100 s), so I'd expect that to h
Hello Erik,
could you elaborate on your setup? Which oscillator (OCXO?) are you
using to drive the STM32's PLL?
I'm currently toying around with a (presumarly?) similar configuration.
An RCB-F9T's 1PPS fed into an STM32G4's 32-bit timer capture to
reference the 1PPS to a local oscillator wit
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