I don't know that I would be too quick to chalk up loss of GNSS to some nefarious individuals. There are a couple of intersections in town where I lose SiriusXM and sometimes GNSS. There is are traffic camera's, speed cameras and an a couple of big cell towers near these intersections. I have played around and by moving up or stopping 10' one way or the other I can not lose satellite signals.
However, wrt to the drone GNSS, is it being flown near possible sources of interference like the ones I mentioned? Near an airport and not necessarily a big one either. Smaller airports usually have a common frequency so the ground services and pilots can communicate with each other.
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It should be relatively easy to spot the most common cheap jammers, but only if they are close to you. Remember that your drone will be able to receive signals within its enhanced radio coverage area that you on the ground can't
They typically transmit a swept signal, often with some additional noise component, and usually have to be at least 10 times stronger at the receiver than the signal being jammed in order to be effective.
In addition to the examples already mentioned cheap GPS jammers also tend to be used inside vehicles for various bad purposes, so these can also be problematic for genuine users, as they move around. I have noticed this myself when using a GPS satnav in my car. Sometimes it can't receive any satellites, even though the sky is not obscured. it is only when I have moved away from other traffic, and reception is restored, that I realised a jammer was probably being used in one of the other vehicles.
Regards,
Martin
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It does not take much power to jam a GPS satellite signal.?
If you are near aircraft traffic the 13th harmonic of aircraft transmissions on or near 121.0 MHz can do it. ?Another source of jamming can be ankle bracelet jammers that convicted criminals use to move around illegally.?
Tune your TinySA Ultra to 1575.42Mhz with the LNA turned ON. If you see any signals at that frequency +/- 1MHz then you have detected the jammer. Tracking down the source is your next challenge.?
-Charlie
W5CDT
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Re: Driver issues on Windows 10 and 11
Perhaps worth reading:? ??
Andy
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Hi! I am new here. I fly drones and have encountered GNSS jammers disrupting my flights. I have ordered a Tiny SA Ultra to check on jammers. Can someone here please advise how can I check the presence of GNSS jammers? Regards, Menon.
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Re: Driver issues on Windows 10 and 11
Bruce,
Fortunate for me there are plenty of computers and O/S's to play with. Jumping to another has spoiled me.? One thing you might consider is if you can boot to USB by bios and install an O/S on the drive.? I've set up a few early windows on 32Gb thumb drives using Fat32 formats (you cannot use the windows formatter).? The HP2USB? utility doesn't like windows 10 either.? There are a few apps out there.? Look for WinToUSB? ?Free Windows-To-Go (WTG) Creator which allows you to install and run a fully-functional Windows on external hard drive, USB flash drive or Thunderbolt drive.? ?If you use a USB SSD you can clone your whole system.
Good luck
Andy
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Measured the 30 MHz output level using a calibrated Anritsu MS2713C?spectrum analyzer. I offset the analyzer and cables at -30 dBm for the correct level, using known calibrated equipment. The reading from my Ultra is -35.32 dBm. The frequency was 16 Hz low. Pretty remarkable consistency.? When measured with an accurate power meter, including all of the harmonics, the total level was -33.32 dBm.
Stuart K6YAZ Los Angeles, California
On Wednesday, December 27, 2023 at 03:38:41 AM PST, Martin via groups.io <martin_ehrenfried@...> wrote:
Tried adding multiple votes, but it doesn't seem possible.
All analysers are out of calibration, but there is a trend towards being slightly low of -35.0 dBm
-35.17 dBm on an HP 8563E
-35.30 dBm on a Signal Hound SA44B
-35.57 dBm on a Rigol DSA815
Regards,
Martin
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Re: Driver issues on Windows 10 and 11
Besides the possibility of bricking my unit there's the actually danger of damaging my only computer.? And there's no one around here, to fix it correctly.? ?So I can't update my SA.? Because the risk is extremely dangerous.
Best regards, Bruce Hawkins - AC6DN.? Sent from my Android phone.? And from: ac6dn@...
On Dec 28, 2023 1:07 PM, Andrew Harman <Nexus9d9@...> wrote: ? ? I'm only an old intermediate user and this frustrates me.? ?On earlier posting on this there were several other bips mentioned.? Using a USB hub was my first attempt to correct, second was the Memory Integrity setting and third was the USB driver removal and reinstallation.? I had opted not to use the STM package but stay with Eriks.? What I initially found was a reference to some other security features maybe it was in the User Account Control (s/s other than simply running as an admin) being embedded in Windows 10.? I have to see if I can find that reference again but it wasn't very detailed and my memory is fading off.
? ?What I did find is that running Erik's program under Windows 8.1 it ran flawless without any driver or security issues.? The 8.1 computer having third party software and freeware is "Air Gapped" meaning not networked.? (That's the highly recommended and standard gov't IT protocol these days.)? ?So native drivers and security settings were good to go.? ?
? ?? What bothers me about the Zadig USB driver install is you do have to be cautious, as he states, since other hardware (like usb keyboards) may not work with an applied driver.? Also stated was windows doing driver checking and the potential for rollback on reboot - meaning you maybe should remove the original driver.? Its a bit of a red flag and yes its recoverable but I'm not sure its the most ideal scenario for everyone. ( I see a potential for other unknown issue creepage along the way)? ?For security and assurance I'm personally opting for the fewest possible third party apps and as much native support as possible.??
? ? What I'm most interested in is learning about those other hidden security features (if) or in the meanwhile will use the "keep it simple stupid" method? by using 8.1 for flashing.? But that's only me.? There are always other options.? ?Whether I use your correction or not I'm glad you've put it on the table.? ?Thanks for sharing.
Andy
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Ah, Herb Yes, thanks --
For more info on the tinySA go to https://tinysa.org/wiki/
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Re: Driver issues on Windows 10 and 11
? ? I'm only an old intermediate user and this frustrates me.? ?On earlier posting on this there were several other bips mentioned.? Using a USB hub was my first attempt to correct, second was the Memory Integrity setting and third was the USB driver removal and reinstallation.? I had opted not to use the STM package but stay with Eriks.? What I initially found was a reference to some other security features maybe it was in the User Account Control (s/s other than simply running as an admin) being embedded in Windows 10.? I have to see if I can find that reference again but it wasn't very detailed and my memory is fading off.
? ?What I did find is that running Erik's program under Windows 8.1 it ran flawless without any driver or security issues.? The 8.1 computer having third party software and freeware is "Air Gapped" meaning not networked.? (That's the highly recommended and standard gov't IT protocol these days.)? ?So native drivers and security settings were good to go.? ?
? ?? What bothers me about the Zadig USB driver install is you do have to be cautious, as he states, since other hardware (like usb keyboards) may not work with an applied driver.? Also stated was windows doing driver checking and the potential for rollback on reboot - meaning you maybe should remove the original driver.? Its a bit of a red flag and yes its recoverable but I'm not sure its the most ideal scenario for everyone. ( I see a potential for other unknown issue creepage along the way)? ?For security and assurance I'm personally opting for the fewest possible third party apps and as much native support as possible.??
? ? What I'm most interested in is learning about those other hidden security features (if) or in the meanwhile will use the "keep it simple stupid" method? by using 8.1 for flashing.? But that's only me.? There are always other options.? ?Whether I use your correction or not I'm glad you've put it on the table.? ?Thanks for sharing.
Andy
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On Thu, Dec 28, 2023 at 10:02 AM, Erik Kaashoek wrote:
To compare levels you better use a cable connection with adequate attenuation
Erik, ? The user's last photo shows a noise floor of -90dBm, and no FM signals detected, with an antenna attached to the low port.? In addition to failing self-test 3, wouldn't that indicate probable front-end damage to the low input - most likely the input attenuator?? The antenna connection should rule out the likelihood of a bad input cable.? Herb
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To compare levels you better use a cable connection with adequate attenuation --
For more info on the tinySA go to https://tinysa.org/wiki/
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Also note that if I apply a digital low pass filter to the signal (this is available within the oscilloscope) using a cutoff frequency of 50 MHz I then obtain a value of -36.16 dBm (versus the -35.21 dBm value I obtained without the use of the digital low pass filter).
Just FYI,
Don wd8dsb
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I connected the TinySA Ultra to my Rigol digital oscilloscope input via a 6 inch piece of RG-316. ?Tee connector on scope input with 50 ohm load. ?Scope displaying Vrms. ?Using the oscilloscope waveforms voltage measurement in RMS I then converted this to power using the 50 ohm load value and then calculated dBm, and I obtained a value of -35.21 dBm.
I did not submit this in the poll but think it¡¯s a pretty valid measurement technique.
Just FYI,
Don wd8dsb?
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Re: Frequency sweep report
On Wed, Dec 20, 2023 at 02:32 PM, Erik Kaashoek wrote:
You can create a python application on a PC connected to the tinySA using the supplied tinysa.py library that does that
On Wed, Dec 20, 2023 at 02:41 PM, hwalker wrote:
You will need to write a customized application to accomplish what you want to do.
Is there something already done and tested, perhaps something unofficial, made by an ordinary user of TinySA Ultra ?
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On Thu, Dec 28, 2023 at 04:31 AM, Andy G0FTD wrote:
Trying to sort out the wheat from the chaff here with the many posts and
bits of info scattered about.
I have updated the firmware on my Tiny SA Ultra.
Done the self tests and calibrations, all passed.
Now do I have to do a CLEAR CONFIG after this ?
What exactly is it clearing ?
? ? CLEAR CONFIG is a hard reset.? It will clear any calibrations you have performed and require you to re-do them. It is advisable to perform a CLEAR CONFIG immediately after you perform a firmware update to wipe out any extraneous trash remaining from the previous firmware update.? A level calibration must be performed after a CLEAR CONFIG or loaded from a configuration file.? It is also advisable to perform a CLEAR CONFIG if you have accidently messed up your configuration settings and are experiencing strange symptoms. Herb
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Hi,
This image is produced while I am broadcasting at 169 MHz near the TinySa (40cm).
The second image shows the same broadcaster (TI launchpad Kit) broadcasting and at 429MHz with an antenna on the high side.
It feels that something is wrong with the low side ...
What next?
Amir
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Trying to sort out the wheat from the chaff here with the many posts and
bits of info scattered about.
I have updated the firmware on my Tiny SA Ultra.
Done the self tests and calibrations, all passed.
Now do I have to do a CLEAR CONFIG after this ?
What exactly is it clearing ?
73 de Andy
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Re: Driver issues on Windows 10 and 11
Update:? I had said earlier that I found that updating the driver via Windows Update fixed my problem.? Unfortunately that was only 1/2 the fix.?? After updating the driver, and therefore fixing the "Driver not found" and warning icon issue, I then had an error "Cannot open DFU device 0483:df11" The fix to this is to replace the installed driver with one that allows DFU updates.? I followed the instruction and installed the WinUSB driver  Follow this link?? It worked like a charm and I was able to update my firmware.
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W5CDT
