¿ªÔÆÌåÓý

  1. Tinysa
  2. Messages
Expanded Topics Messages Polls
Date
Re: how to save the calibration data for 6G-12G for SA and SG in the high freq for Ultra

 

Except the 30 MHz point you can choose all frequencies as you like.?
--
Designer of the tinySA
For more info go to

Re: how to save the calibration data for 6G-12G for SA and SG in the high freq for Ultra

 

Ok, works nice.
?
Is there any specific reason for the certain selection of the frequencies for the curve points? - I do not see a mathematical system in the steps.
Can I select them free w/o violating system expections? (except the first point at 30Mc)
?
Please recommend.
Thanks,
Johann
?
Re: TinySA App CSV 10 dB difference #WindowsAPP #csv #software #tinysa

 

It depends on which instrument you trust, and the type of modulation in use.
?
It's difficult to tell from your screen grabs, but WWB seems to have a much higher noise floor, in relation to the peak signal level.
?
What is causing this difference ?
?
Is it the type of detector (peak, average etc.), or differences in bandwidth that are being used by each instrument ?
?
Try experimenting with different settings of TinySA bandwidth, sweep rate and LNA / attenuator values.
?
Regards,
?
Martin
?
On Sun, Sep 29, 2024 at 06:03 AM, <musicfordrumies@...> wrote:

A few days ago, I found out there is a difference of aproximately 10 dB when showing the same scan on the TinySA app and the mics coordinating app (WWB)
TinySA App CSV 10 dB difference #WindowsAPP #csv #software #tinysa

 

Hi everyone. I got a TinySA and I've been learning how to use the scans from the Windows App for coordinating wireless mics frequencies. A few days ago, I found out there is a difference of aproximately 10 dB when showing the same scan on the TinySA app and the mics coordinating app (WWB). Also, I've compared my tinySA scans with some others I made with a Shure Rx (QLXD4 model) and when importing onto WWB the TinySA ones are 10 dB lower. Is there something I am missing? Should I enter the dB difference as level gain so the noise floor matches between scans? What would you recommend in this situation?
My TinySA is calibrated as suggested in the web page (low input calibration with both sma connected with one cable) and the high port has been matched with a known frequency in the overlaping region between the High and the calibrated Low port, so it should perform well. Is there some scanning I am missing?
Re: TinySA ULTRA: measurement results for telecom mobile networks with 5G standard (for FREQ ranges 3480 MHz - 3800 MHZ)? #specifications #ultra

 

Toni,
Most dominant problem is seeing a mirror/ghost? at an offset of roughly 2 GHz from the actual signal.
So whenever you see broadband signal 2 GHz away from another broadband signal you may expect one to be a mirror/ghost.
--
Designer of the tinySA
For more info go to

Re: TinySA ULTRA: measurement results for telecom mobile networks with 5G standard (for FREQ ranges 3480 MHz - 3800 MHZ)? #specifications #ultra

 

@ToniZG
?
Hi,
?
could you please specify what software you used to generate those graphs ?
Re: how to save the calibration data for 6G-12G for SA and SG in the high freq for Ultra

 

You have to enter upfront the actual output level of the generator. Then you select each point, set the generator to the correct frequency and check if the signal is visible and the marker is correctly place on the peak. Then you clock OK to use the measure peak level to correct. When you select the same frequency again the peak should be on the actual output level from the generator
?
harm_lna is the table used when in harmonic mode with LNA enabled.
?
--
Designer of the tinySA
For more info go to

Re: how to save the calibration data for 6G-12G for SA and SG in the high freq for Ultra

 

ok, thanks - i found it.
?
How does it work? when I select this menu point, I am asked for the actual level - I assume I have to apply a single signal with known level, the tinySA software uses the found peak for examining the frequency to correct and the known level has to be entered, this for each frequency? I want to correct. I am right?
?
Additional question: under which circumstandes I have to modify also the harm_lna table?
?
Thanks,
Johann
Re: Is the TinySA Ultra capable of measuring short radar pulses?

 

One thing I need to add
The power of the short burst will only be measured correctly if their maximum power is at most 60 dB above the noise level as the AGC inside the tinySA can not react to such shorts bursts
Best is to set the attenuation/signal level? such that the signal level is expected to be no more than 60 dB above the noise floor of the tinySA.
With 50 microsecond bursts that are detected every sweep the AGC will correctly auto set the internal attenuation?
--
Designer of the tinySA
For more info go to

Re: Is the TinySA Ultra capable of measuring short radar pulses?

 

Mike,
Interesting experiment.
I took a signal generator at 10 MHz and -10 dBm and changed the signal burst length starting with 0.1 micro seconds and 10 ms burst repetition time
The tinySA was set to 10 Mhz zero span, 850 kHz RBW and to trigger in NORMAL mode at a level of -15 dBm
At 6 microsecond burst length the -10 dBm signal level was occasionally reached, longer bursts did increase the frequency of triggering.?
Reducing the burst length required lower level of triggering to see the burst.
This implies the minimum burst length for being able to occasionally measure the true signal level is around 6 micro seconds.
Due to the fixed DSP detector inside the tinySA that requires at least some samples for the single bucket DFT filter, it is impossible to reduce this time.
With reduced RBW the minimum time required for true level detection increases as more samples are needed for the resolution filter.
?
At -60 dBm trigger level the 10 microseconds bursts showed varying levels
This is caused by the roughly 40 microseconds interval between the samples taken where there is some dead time in the 40 microseconds sample interval.
Signal bursts of 50 micro seconds always where measured at the -10 dBm level as these are guaranteed to cover the whole 40 microseconds sampling interval.
Due to the design of the level detector in the tinySA it is impossible to reduce or eliminate this dead time in the signal sampling?
?
I will add this info the the tinySA specification.
--
Designer of the tinySA
For more info go to

Re: Is the TinySA Ultra capable of measuring short radar pulses?

 

Thanks Roger.
<snip from keysight link> "With an FFT rate of almost 120,000 per second and FFT overlapping, each display update represents about 2,500 spectra of gap-free data capture."
OK I get that the?RTSA is very powerful and necessary to?differentiate complex?WiFi and BT signals.?I am wondering if all that power is necessary for this specific radar pulse.?
BTW, I can get the same plots with the HP8562E but I presume that is because it is analog and much easier to process.
image.png

Is there anything?we could do with the TinySA to get close? Is there a basic limitation such as the sampling frequency? Or the size of the FFT? Or buffers?
Is the challenge the narrow pulse width, or the dynamic range, or the pulse repetition?rate?
I see a previous topic about measuring doppler radar "PRT 120Hz-500hz (2ms-8ms), the pulse width is about 20us to 32us, and the center frequency is 9.33Ghz."
Is that easier since it is a wider pulse? Or greater PRT?



On Thu, Sep 26, 2024 at 11:07?PM Roger Need via <sailtamarack=[email protected]> wrote:
The TinySA sweep rate is not fast enough to capture short duration burst signals like this. ?

The Fieldfox will do the job but it costs 100 times more.? Optimized circuitry for these types of signals.? Here is a description of how they do it¡­
?
Re: Pre amplifier from Zeenco store

 

I now also placed order for pre-amp ZK-09BM from Zeenko store!
?
BTW, I've received the good TinySA ultra from the Zeenko store yesterday,
instead illegal clone, that I received earlier from unsafe seller on ebay.
?
Hugen, thanks!!
Re: Is the TinySA Ultra capable of measuring short radar pulses?

 

The TinySA sweep rate is not fast enough to capture short duration burst signals like this. ?

The Fieldfox will do the job but it costs 100 times more. ?Optimized circuitry for these types of signals. ?Here is a description of how they do it¡­
?
https://www.keysight.com/ca/en/assets/7018-05591/brochures/5992-2069.pdf
Is the TinySA Ultra capable of measuring short radar pulses?

 

I recently purchased a TinySA Ultra in hopes of being able to measure the strength of a radar signal at various locations of my property. After weeks of comparing the (borrowed) Agilent FieldFox N9915A results to TinySA, I am coming to the realization that the TInySA is not capable. The radar signal is composed of 2.8752 GHz, +5dBm, 1us duration pulses every 1ms. The radar spins so I get a burst of about 20 of these pulses every 4.8 seconds.

This is the best I can do with TinySA. Unchecking the Spur Removal seemed to help but changing NSpeedUp, WSpeedUp and #points did not have any effect.?
Why are the power levels of the pulses so different using?the?TinySA while the FieldFox is very consistent (and much higher)?
image.png
image.png


Below is for comparison.
Thanks in advance.
~~Mike Flohr


Here is Fieldfox capture over 6 seconds:
image.png
And over 50ms
image.png
And over 50us
image.png
Re: Pre amplifier from Zeenco store

 

Please see the mail I send, thanks.
Re: Pre amplifier from Zeenco store

 

Hello John, you can remove the USB port or scrape the solder resist of the wire near the USB port and solder the power supply.
If you want us to make a version without the USB port, and if the power supply you are soldering to is a low noise power supply, does that mean that the LDO is also not needed so that you can connect directly to the 5V supply, higher voltages will have better OIP3.
Pre amplifier from Zeenco store

 

Mine arrived today, really fast shipping. What impressed me was the small size. The gain and noise figure are as expected. It does roll off above 6GHz quickly but that is to be expected.
I do wonder if there will be an offering for this amplifier without the USB C connection, just 2 solder pads. For me USB C on everything is such a hassle and I will end up removing them in most cases.
The? manufacturing cost would be lower for that too, with no cable to ship and no jack to be soldered. If you ever offer them without USB C I might order more than a hand full of them since they would be quite useful in many a project.
?
John
Re: how to save the calibration data for 6G-12G for SA and SG in the high freq for Ultra

 

Harm curve editing is already present in the latest FW
It is missing from the manual.
--
Designer of the tinySA
For more info go to

Re: 5.8GHz wideband video signal measurements

 

Hi Toni,
?
Your video is really interesting. May I know what type of antenna you're using? It looks handmade. I don't have much knowledge about antennas, but theoretically, if I have an antenna similar to the one used by the drone, could the tinySA still detect the signal at the same distance the drone operates? What antenna specifications should I focus on if I want to detect a drone from as far away as possible using the tinySA? Thank you.
?
Best regards,
Hai
On Tue, Sep 24, 2024 at 04:17 AM, ToniZG wrote:

https://youtu.be/ssTLa3vqSQ8?si=Ed1CYqdtQQkg1zaW
Re: #software QtTinySA v0.11.7 release #software

 

Could this be released in a Flatpak for Linux?
?
Regards,
?
?
Jason
1741 - 1760 of 19619